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root/i-scream/projects/cms/source/host/c++/socket++-1.10/socket++.ps
Revision: 1.2
Committed: Wed Jun 13 19:37:28 2001 UTC (23 years, 5 months ago) by tdb
Content type: application/postscript
Branch: MAIN
CVS Tags: HEAD
Changes since 1.1: +0 -0 lines
State: FILE REMOVED
Log Message: 
Basically done a make distclean (or make real-clean in this case). No idea
why we needed all this "generated" stuff lying about.
Left libsocket++.a though, until the main Makefile will use it.

File Contents

# Content
1 %!PS-Adobe-2.0
2 %%Creator: dvips, version 5.41 (C) 1986-90 Radical Eye Software
3 %%Title: socket++.dvi
4 %%Pages: 56 1
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1347 %%EndProlog
1348 %%BeginSetup
1349 %%Feature: *Resolution 300
1350 TeXDict begin
1351 %%EndSetup
1352 %%Page: 1 1
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1354 0 726 1950 17 v 1535 774 a Fn(V)l(ersion:)21 b(27Jan94)14 b(1.6)0
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1356 9 v eop
1357 %%Page: 2 2
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1359 b Fn(1992,1993,199)o(4)d(Gnanasek)m(aran)j(Sw)o(aminathan)0
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1362 y(P)o(ermission)g(is)g(gran)o(ted)f(to)g(mak)o(e)g(and)h(distribute)h(v)o
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1364 (y-)0 2661 y(righ)o(t)g(notice)h(and)f(this)h(p)q(ermission)g(notice)g(are)f
1365 (preserv)o(ed)h(on)f(all)h(copies.)p eop
1366 %%Page: 1 3
1367 bop 0 -58 a Fn(So)q(c)o(k)o(et)p Fo(++)15 b Fn(Library)g(Cop)o(yrigh)o(t)g
1368 (Notice)1231 b(1)0 183 y Fk(So)r(c)n(k)n(et)p Fj(++)15 b Fk(Library)f(Cop)n
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1371 (to)h(use)g(at)g(y)o(our)g(o)o(wn)f(risk)i(and)f(distribute)i(this)e(soft)o
1372 (w)o(are)f(in)i(source)f(and)g(binary)0 569 y(forms)j(pro)o(vided)h(the)g(ab)
1373 q(o)o(v)o(e)g(cop)o(yrigh)o(t)f(notice)h(and)g(this)g(paragraph)f(are)h
1374 (preserv)o(ed)g(on)f(all)i(copies.)31 b(This)0 632 y(soft)o(w)o(are)13
1375 b(is)j(pro)o(vided)g Fo(")p Fn(as)f(is)p Fo(")g Fn(with)h(no)f(express)g(or)g
1376 (implied)j(w)o(arran)o(t)o(y)l(.)p eop
1377 %%Page: 2 4
1378 bop 0 -58 a Fn(Ac)o(kno)o(wledgmen)o(ts)1572 b(2)0 183 y Fk(Ac)n(kno)n
1379 (wledgmen)n(ts)62 370 y Fn(Gordon)16 b(Joly)i Fo(<)p Fn(G.Joly)p
1380 Fo(@)p Fn(cs.ucl.ac.uk)p Fo(>)e Fn(for)h(rep)q(orting)g(bugs)f(in)i(pip)q
1381 (estream)g(class)f(implemen)o(tation)h(and)0 432 y(pro)o(viding)c(an)e(ftp)h
1382 (site)g(for)f(the)h(so)q(c)o(k)o(et)p Fo(++)f Fn(library)h(at)f
1383 (cs.ucl.ac.uk:)p Fo(~)p Fn(ftp/coside/gn)o(u/so)q(c)o(k)o(et)p
1384 Fo(++)p Fn(-1.x.tar.gz)e(He)0 495 y(also)15 b(kno)o(ws)g(ho)o(w)f(to)h(mak)o
1385 (e)g(the)g(so)q(c)o(k)o(et)p Fo(++)f Fn(library)i(a)f(shared)h(library)l(.)62
1386 632 y(Jim)g(Anderson)g(for)f(rep)q(orting)g(a)g(bug)g(in)h(so)q(c)o(kinet.C)
1387 62 769 y(Carl)f(Ga)o(y)g Fo(<)p Fn(cga)o(y)p Fo(@)p Fn
1388 (skinner.cs.uoregon.edu)p Fo(>)f Fn(for)h(rep)q(orting)g(a)g(bug)h(and)f(a)g
1389 (\014x)g(in)h(so)q(c)o(kinet.C)62 906 y(Oliv)o(er)j(Im)o(busc)o(h)f
1390 Fo(<)p Fn(\015ab)q(es)p Fo(@)p Fn(parystec.de)p Fo(>)g Fn(for)f(rep)q(orting)
1391 h(a)f(bug)h(in)g(Mak)o(e\014le.in)g(and)g(suggesting)g(sev)o(eral)0
1392 968 y(enhancemen)o(ts)e(for)e(so)q(c)o(kbuf)i(class.)62 1105
1393 y(Dierk)g(W)l(endt)f Fo(<)p Fn(w)o(endt)p Fo(@)p Fn(lam)o(b)q(da.hella.de)p
1394 Fo(>)i Fn(for)d(rep)q(orting)i(errors)e(in)i(the)f(so)q(c)o(k)o(et)p
1395 Fo(++)g Fn(do)q(cumen)o(tation.)62 1242 y(P)o(er)g(Bothner)h
1396 Fo(<)p Fn(b)q(othner)p Fo(@)p Fn(cygn)o(us.com)p Fo(>)f Fn(for)f
1397 (con\014gure,)i(con\014g.sub,)f(con\014g.shared)g(and)h(mo)o(v)o(e-if-c)o
1398 (hange)0 1304 y(\014les)h(that)d(are)i(used)g(to)f(generate)g(Mak)o(e\014le.)
1399 21 b(These)16 b(\014les)h(are)e(tak)o(en)g(from)g(his)h(libg)p
1400 Fo(++)p Fn(-2.4)g(and)f(hence,)i(these)0 1366 y(\014les)f(are)f(go)o(v)o
1401 (erned)g(b)o(y)g(the)g(Cop)o(yrigh)o(t)g(Notice)g(found)h(in)g(the)f(\014le)i
1402 (LICENCE)e(in)h(libg)p Fo(++)p Fn(.)p eop
1403 %%Page: 3 5
1404 bop 0 -58 a Fn(Chapter)15 b(1:)k(Ov)o(erview)d(of)f(So)q(c)o(k)o(et)p
1405 Fo(++)g Fn(Library)1102 b(3)0 183 y Fk(1)41 b(Ov)n(erview)13
1406 b(of)i(So)r(c)n(k)n(et)p Fj(++)f Fk(Library)62 370 y Fn(So)q(c)o(k)o(et)p
1407 Fo(++)h Fn(library)h(de\014nes)g(a)f(family)h(of)f(C)p Fo(++)f
1408 Fn(classes)i(that)f(can)g(b)q(e)h(used)g(more)e(e\013ectiv)o(ely)j(than)e
1409 (directly)0 432 y(calling)h(the)e(underlying)j(lo)o(w-lev)o(el)e(system)f
1410 (functions.)20 b(One)c(distinct)f(adv)m(an)o(tage)f(of)g(the)g(so)q(c)o(k)o
1411 (et)p Fo(++)f Fn(is)i(that)f(it)0 495 y(has)f(the)g(same)f(in)o(terface)i(as)
1412 e(that)g(of)h(the)g(iostream)f(so)h(that)f(the)h(users)g(can)g(p)q(erform)g
1413 (t)o(yp)q(e-safe)g(input)h(output.)0 557 y(See)i(y)o(our)e(lo)q(cal)j
1414 (IOStream)e(library)h(do)q(cumen)o(tation)g(for)e(more)h(information)h(on)f
1415 (iostreams.)62 694 y Fo(streambuf)f Fn(coun)o(terpart)h(of)f(the)i(so)q(c)o
1416 (k)o(et)p Fo(++)e Fn(is)i Fo(sockbuf)p Fn(.)i Fo(sockbuf)d
1417 Fn(is)g(an)g(endp)q(oin)o(t)i(for)d(comm)o(unication)0 756
1418 y(with)k(y)o(et)f(another)g Fo(sockbuf)g Fn(or)g(simply)i(a)e
1419 Fo(socket)g Fn(descriptor.)28 b Fo(sockbuf)16 b Fn(has)i(also)f(metho)q(ds)h
1420 (that)f(act)g(as)0 818 y(in)o(terfaces)d(for)f(most)g(of)h(the)g(commonly)g
1421 (used)h(system)e(calls)i(that)e(in)o(v)o(olv)o(e)i(so)q(c)o(k)o(ets.)j(See)d
1422 (Chapter)f(2)f([so)q(c)o(kbuf)0 881 y(Class],)h(page)i(4,)e(for)h(more)f
1423 (information)i(on)f(the)g(so)q(c)o(k)o(et)g(bu\013er)g(class.)62
1424 1018 y(F)l(or)f(eac)o(h)h(comm)o(unication)g(domain,)g(w)o(e)f(deriv)o(e)i(a)
1425 e(new)h(class)g(from)e Fo(sockbuf)h Fn(that)g(has)g(some)h(additional)0
1426 1080 y(metho)q(ds)h(that)f(are)h(sp)q(eci\014c)i(to)d(that)g(domain.)23
1427 b(A)o(t)15 b(presen)o(t,)h(only)g Fi(unix)k Fn(and)c Fi(inet)i
1428 Fn(domains)e(are)g(supp)q(orted.)0 1142 y Fo(sockunixbuf)d
1429 Fn(class)h(and)h Fo(sockinetbuf)e Fn(class)h(de\014ne)i(the)e
1430 Fi(unix)19 b Fn(and)14 b Fi(inet)i Fn(domain)f(of)f(so)q(c)o(k)o(ets)f(resp)q
1431 (ectiv)o(ely)l(.)0 1204 y(See)h(Chapter)f(6)g([so)q(c)o(kunixbuf)h(Class],)f
1432 (page)g(21,)f(for)h Fi(unix)k Fn(so)q(c)o(k)o(ets)c(and)g(See)h(Chapter)f(4)g
1433 ([so)q(c)o(kinetbuf)h(Class],)0 1267 y(page)h(14,)f(for)h Fi(inet)i
1434 Fn(so)q(c)o(k)o(ets.)62 1404 y(W)l(e)e(also)g(ha)o(v)o(e)g(domain)g(sp)q
1435 (eci\014c)i(so)q(c)o(k)o(et)e(address)g(classes)g(that)f(are)h(deriv)o(ed)h
1436 (from)e(a)h(common)g(base)g(class)0 1466 y(called)g Fo(sockAddr)p
1437 Fn(.)j Fo(sockunixaddr)11 b Fn(class)j(is)g(used)g(for)e Fi(unix)18
1438 b Fn(domain)13 b(addresses)h(and)f Fo(sockinetaddr)f Fn(class)h(is)0
1439 1528 y(used)j(for)f Fi(inet)i Fn(domain)f(addresses.)21 b(F)l(or)15
1440 b(more)g(information)h(on)f(address)h(classes)g(see)g(Chapter)f(3)g([so)q(c)o
1441 (kAddr)0 1590 y(Class],)22 b(page)f(13,)h(Chapter)f(7)g([so)q(c)o(kunixaddr)h
1442 (Class],)g(page)f(25,)h(and)f(Chapter)g(5)g([so)q(c)o(kinetaddr)h(Class],)0
1443 1653 y(page)15 b(19.)120 1790 y Fi(Note)s Fn(:)i Fo(sockAddr)9
1444 b Fn(is)j(not)e(sp)q(elled)j Fo(sockaddr)d Fn(in)h(order)g(to)f(prev)o(en)o
1445 (t)h(name)f(clash)i(with)f(the)g Fo(struct)120 1840 y(sockaddr)j
1446 Fn(declared)i(in)h(`)p Fo(<sys/socket.h>)p Fn('.)62 2051 y(W)l(e)k(noted)f
1447 (earlier)i(that)d(so)q(c)o(k)o(et)p Fo(++)h Fn(pro)o(vides)h(the)f(same)g(in)
1448 o(terface)h(as)f(the)g(iostream)g(library)l(.)37 b(F)l(or)20
1449 b(ex-)0 2114 y(ample,)e(in)f(the)g(in)o(ternet)h(domain,)f(w)o(e)g(ha)o(v)o
1450 (e)f Fo(isockinet)p Fn(,)g Fo(osockinet)p Fn(,)g(and)h Fo(iosockinet)f
1451 Fn(classes)h(that)f(are)0 2176 y(coun)o(terparts)e(to)g Fo(istream)p
1452 Fn(,)f Fo(ostream)p Fn(,)g(and)i Fo(iostream)e Fn(classes)i(of)f(IOStream)h
1453 (library)l(.)21 b(F)l(or)13 b(more)i(details)g(on)0 2238 y
1454 Fo(iosockstream)f Fn(classes)h(see)h(See)g(Chapter)e(8)h([so)q(c)o(kstream)f
1455 (Classes],)h(page)g(26.)62 2375 y(The)c(services)g(of)e Fo(pipe\(\))p
1456 Fn(,)h Fo(socketpair\(\))p Fn(,)f(and)i Fo(popen\(\))e Fn(system)h(calls)h
1457 (are)f(pro)o(vided)h(b)o(y)f(the)g Fo(pipestream)0 2437 y Fn(class.)20
1458 b(See)c(Chapter)f(9)g([pip)q(estream)g(Classes],)g(page)g(33.)p
1459 eop
1460 %%Page: 4 6
1461 bop 0 -58 a Fn(Chapter)15 b(2:)k Fo(sockbuf)c Fn(Class)1408
1462 b(4)0 183 y Fk(2)41 b Fj(sockbuf)14 b Fk(Class)62 383 y Fo(sockbuf)h
1463 Fn(class)g(is)h(deriv)o(ed)h(from)d Fo(streambuf)h Fn(class)g(of)g(the)h
1464 (iostream)f(library)l(.)21 b(Y)l(ou)16 b(can)g(sim)o(ultaneously)0
1465 445 y(read)d(and)h(write)g(in)o(to)f(a)g Fo(sockbuf)f Fn(just)i(lik)o(e)g(y)o
1466 (ou)f(can)h(listen)h(and)e(talk)h(through)f(a)g(telephone.)20
1467 b(T)l(o)14 b(accomplish)0 508 y(the)h(ab)q(o)o(v)o(e)g(goal,)g(w)o(e)g(main)o
1468 (tain)g(t)o(w)o(o)f(indep)q(enden)o(t)k(bu\013ers)d(for)f(reading)i(and)f
1469 (writing.)0 755 y Fm(2.1)33 b(Constructors)62 895 y Fo(sockbuf)13
1470 b Fn(constructors)g(sets)h(up)g(an)g(endp)q(oin)o(t)h(for)e(comm)o
1471 (unication.)20 b(A)14 b Fo(sockbuf)f Fn(ob)s(ject)g(so)h(created)g(can)0
1472 957 y(b)q(e)19 b(read)e(from)h(and)g(written)g(to)f(in)i(linebu\013ered)h(mo)
1473 q(de.)28 b(T)l(o)18 b(c)o(hange)g(mo)q(de,)g(refer)g(to)f Fo(streambuf)g
1474 Fn(class)h(in)0 1020 y(y)o(our)d(IOStream)g(library)l(.)120
1475 1159 y Fi(Note)s Fn(:)20 b(If)c(y)o(ou)f(are)g(using)h(A)l(T&T)g(IOStream)g
1476 (library)l(,)g(then)g(the)g(linebu\013ered)i(mo)q(de)e(is)g(p)q(erma-)120
1477 1209 y(nen)o(tly)g(turned)h(o\013.)k(Th)o(us,)15 b(y)o(ou)h(need)g(to)f
1478 (explicitly)k(\015ush)d(a)g(so)q(c)o(k)o(et)f(stream.)21 b(Y)l(ou)16
1479 b(can)g(\015ush)g(a)120 1259 y(so)q(c)o(k)o(et)f(stream)f(bu\013er)h(in)h
1480 (one)g(of)e(the)i(follo)o(wing)f(four)g(w)o(a)o(ys:)335 1386
1481 y Fo(//)24 b(os)g(is)f(a)h(socket)f(ostream)335 1436 y(os)h(<<)g("this)f(is)g
1482 (a)h(test")f(<<)h(endl;)335 1486 y(os)g(<<)g("this)f(is)g(a)h(test\\n")f(<<)h
1483 (flush;)335 1535 y(os)g(<<)g("this)f(is)g(a)h(test\\n";)f(os.flush)g(\(\);)
1484 335 1585 y(os)h(<<)g("this)f(is)g(a)h(test\\n";)f(os->sync)g(\(\);)62
1485 1802 y(sockbuf)14 b Fn(ob)s(jects)h(are)g(created)g(as)g(follo)o(ws)g(where)
1486 25 1942 y Fl(\000)30 b Fo(s)15 b Fn(and)g Fo(so)g Fn(are)g
1487 Fo(sockbuf)f Fn(ob)s(jects)25 2019 y Fl(\000)30 b Fo(sd)15
1488 b Fn(is)h(an)f(in)o(teger)g(whic)o(h)h(is)g(a)f(so)q(c)o(k)o(et)f(descriptor)
1489 25 2096 y Fl(\000)30 b Fo(af)15 b Fn(and)g Fo(proto)g Fn(are)g(in)o(tegers)g
1490 (whic)o(h)h(denote)f(domain)h(n)o(um)o(b)q(er)g(and)f(proto)q(col)g(n)o(um)o
1491 (b)q(er)h(resp)q(ectiv)o(ely)25 2174 y Fl(\000)30 b Fo(ty)17
1492 b Fn(is)g(a)g Fo(sockbuf::type)e Fn(and)j(m)o(ust)e(b)q(e)i(one)f(of)g
1493 Fo(sockbuf::sock_stream)p Fn(,)d Fo(sockbuf::sock_dgram)p Fn(,)90
1494 2236 y Fo(sockbuf::sock_raw)p Fn(,)e Fo(sockbuf::sock_rdm)p
1495 Fn(,)h(and)i Fo(sockbuf::sock_seqpacket)0 2376 y(sockbuf)f(s\(sd\);)0
1496 2438 y(sockbuf)g(s;)240 2515 y Fn(Set)h(so)q(c)o(k)o(et)g(descriptor)h(of)e
1497 Fo(s)h Fn(to)g Fo(sd)g Fn(\(defaults)g(to)g(-1\).)k Fo(sockbuf)14
1498 b Fn(destructor)h(will)i(close)f Fo(sd)p Fn(.)0 2593 y Fo(sockbuf)e(s\(af,)h
1499 (ty,)f(proto\);)240 2670 y Fn(Set)h(so)q(c)o(k)o(et)g(descriptor)h(of)e
1500 Fo(s)h Fn(to)g Fo(::socket\(af,)e(int\(ty\),)h(proto\);)p eop
1501 %%Page: 5 7
1502 bop 0 -58 a Fn(Chapter)15 b(2:)k Fo(sockbuf)c Fn(Class)1408
1503 b(5)0 183 y Fo(sockbuf)14 b(so\(s\);)240 259 y Fn(Set)h(so)q(c)o(k)o(et)g
1504 (descriptor)h(of)e Fo(so)h Fn(to)g(the)g(so)q(c)o(k)o(et)g(descriptor)g(of)g
1505 Fo(s)p Fn(.)0 334 y Fo(s.open\(ty,)f(proto\))240 409 y Fn(do)q(es)i(nothing)f
1506 (and)h(returns)f(simply)h Fo(0)p Fn(,)f(the)g(n)o(ull)i(p)q(oin)o(ter)e(to)g
1507 Fo(sockbuf)p Fn(.)0 485 y Fo(s.is_open\(\))240 560 y Fn(returns)g(a)g
1508 (non-zero)g(n)o(um)o(b)q(er)h(if)g(the)f(so)q(c)o(k)o(et)g(descriptor)g(is)h
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1510 b(a)g(reference)h Fo(s)f Fn(after)f(assigning)i Fo(s)f Fn(with)h
1511 Fo(so)p Fn(.)0 865 y Fm(2.2)33 b(Destructor)62 1002 y Fo
1512 (sockbuf::~sockbuf\(\))14 b Fn(\015ushes)j(output)f(and)g(closes)h(its)f(so)q
1513 (c)o(k)o(et)g(if)g(no)h(other)e(so)q(c)o(kbuf)i(is)f(referencing)i(it)0
1514 1065 y(and)p 91 1065 14 2 v 32 w(S)p 133 1065 V 16 w(DELETE)p
1515 338 1065 V 16 w(DONT)p 491 1065 V 17 w(CLOSE)e(\015ag)f(is)g(not)g(set.)20
1516 b(It)15 b(also)g(deletes)h(its)g(read)f(and)g(write)h(bu\013ers.)62
1517 1202 y(In)g(what)f(follo)o(ws,)25 1340 y Fl(\000)30 b Fo(s)15
1518 b Fn(is)h(a)f Fo(sockbuf)f Fn(ob)s(ject)25 1415 y Fl(\000)30
1519 b Fo(how)10 b Fn(is)g(of)g(t)o(yp)q(e)g Fo(sockbuf::shuthow)e
1520 Fn(and)j(m)o(ust)e(b)q(e)i(one)f(of)g Fo(sockbuf::shut_read)p
1521 Fn(,)e Fo(sockbuf::shut_write)p Fn(,)90 1477 y(and)15 b Fo
1522 (sockbuf::shut_readwrite)0 1615 y(sockbuf::~sockbuf\(\))240
1523 1690 y Fn(\015ushes)i(output)f(and)g(closes)g(its)h(so)q(c)o(k)o(et)e(if)i
1524 (no)f(other)f Fo(sockbuf)g Fn(ob)s(ject)h(is)g(referencing)h(it)g(b)q(efore)
1525 240 1753 y(deleting)f(its)f(read)f(and)h(write)f(bu\013ers.)20
1526 b(If)14 b(the)p 1068 1753 V 31 w(S)p 1109 1753 V 17 w(DELETE)p
1527 1315 1753 V 16 w(DONT)p 1468 1753 V 16 w(CLOSE)i(\015ag)e(is)h(set,)f(then)
1528 240 1815 y(the)h(so)q(c)o(k)o(et)g(is)h(not)e(closed.)0 1890
1529 y Fo(s.close\(\))240 1965 y Fn(closes)d(the)f(so)q(c)o(k)o(et)g(ev)o(en)g(if)
1530 h(it)f(is)h(referenced)g(b)o(y)f(other)g Fo(sockbuf)f Fn(ob)s(jects)g(and)p
1531 1579 1965 V 27 w(S)p 1621 1965 V 17 w(DELETE)p 1827 1965 V
1532 16 w(DONT)p 1980 1965 V 16 w(CLOSE)240 2028 y(\015ag)15 b(is)h(set.)0
1533 2103 y Fo(s.shutdown\(how\))240 2178 y Fn(sh)o(uts)10 b(do)o(wn)g(read)g(if)g
1534 Fo(how)g Fn(is)h Fo(sockbuf::shut_read)p Fn(,)d(sh)o(uts)i(do)o(wn)g(write)g
1535 (if)h Fo(how)e Fn(is)i Fo(sockbuf::shut_write)p Fn(,)240 2241
1536 y(and)k(sh)o(uts)g(do)o(wn)g(b)q(oth)h(read)f(and)g(write)g(if)h
1537 Fo(how)f Fn(is)h Fo(sockbuf::shut_readwrite)o Fn(.)0 2470 y
1538 Fm(2.3)33 b(Reading)15 b(and)h(W)-6 b(riting)62 2608 y Fo(sockbuf)17
1539 b Fn(class)g(o\013ers)g(sev)o(eral)g(w)o(a)o(ys)g(to)f(read)i(and)f(write)h
1540 (and)f(tailors)h(the)f(b)q(eha)o(vior)h(of)f(sev)o(eral)g(virtual)0
1541 2670 y(functions)f(of)f Fo(streambuf)f Fn(for)g(so)q(c)o(k)o(et)h(comm)o
1542 (unication.)p eop
1543 %%Page: 6 8
1544 bop 0 -58 a Fn(Chapter)15 b(2:)k Fo(sockbuf)c Fn(Class)1408
1545 b(6)62 183 y(In)16 b(case)f(of)g(error,)f Fo(sockbuf::error\(const)f(char*\))
1546 h Fn(is)i(called.)62 321 y(In)g(what)f(follo)o(ws,)25 459 y
1547 Fl(\000)30 b Fo(s)15 b Fn(is)h(a)f Fo(sockbuf)f Fn(ob)s(ject)25
1548 535 y Fl(\000)30 b Fo(buf)15 b Fn(is)g(bu\013er)h(of)e(t)o(yp)q(e)i
1549 Fo(char*)25 610 y Fl(\000)30 b Fo(bufsz)14 b Fn(is)i(an)f(in)o(teger)h(and)f
1550 (is)h(less)g(than)f Fo(sizeof\(buf\))25 686 y Fl(\000)30 b
1551 Fo(msgf)15 b Fn(is)g(an)g(in)o(teger)h(and)f(denotes)h(the)f(message)g
1552 (\015ag)25 762 y Fl(\000)30 b Fo(sa)15 b Fn(is)h(of)e(t)o(yp)q(e)i
1553 Fo(sockAddr)25 837 y Fl(\000)30 b Fo(msgh)15 b Fn(is)g(a)g(p)q(oin)o(ter)h
1554 (to)e Fo(struct)h(msghdr)25 913 y Fl(\000)30 b Fo(wp)15 b Fn(is)h(an)f(in)o
1555 (teger)g(and)g(denotes)h(time)f(in)h(seconds)25 988 y Fl(\000)30
1556 b Fo(c)15 b Fn(is)h(a)f(c)o(har)0 1126 y Fo(s.is_open\(\))240
1557 1202 y Fn(returns)g(a)g(non-zero)g(n)o(um)o(b)q(er)h(if)g(the)f(so)q(c)o(k)o
1558 (et)g(descriptor)g(is)h(op)q(en)g(else)g(return)f(0.)0 1278
1559 y Fo(s.is_eof\(\))240 1353 y Fn(returns)g(a)g(non-zero)g(n)o(um)o(b)q(er)h
1560 (if)g(the)f(so)q(c)o(k)o(et)g(has)g(seen)g(EOF)g(while)i(reading)f(else)g
1561 (return)f(0.)0 1429 y Fo(s.write\(buf,)f(bufsz\))240 1505 y
1562 Fn(returns)20 b(an)f(in)o(t)i(whic)o(h)f(m)o(ust)f(b)q(e)i(equal)f(to)g
1563 Fo(bufsz)f Fn(if)h Fo(bufsz)f Fn(c)o(hars)h(in)g(the)g Fo(buf)f
1564 Fn(are)h(written)240 1567 y(successfully)l(.)37 b(It)20 b(returns)g(0)g(if)h
1565 (there)f(is)h(nothing)g(to)e(write)i(or)e(if,)j(in)f(case)f(of)g(timeouts,)h
1566 (the)240 1629 y(so)q(c)o(k)o(et)15 b(is)g(not)g(ready)g(for)g(write)g
1567 (Section)h(2.6)e([Timeouts],)h(page)g(11.)0 1705 y Fo(s.send\(buf,)f(bufsz,)g
1568 (msgf\))240 1780 y Fn(same)20 b(as)g Fo(sockbuf::write)f Fn(describ)q(ed)k
1569 (ab)q(o)o(v)o(e)d(but)g(allo)o(ws)h(the)g(user)g(to)f(con)o(trol)g(the)g
1570 (trans-)240 1843 y(mission)f(of)f(messages)g(using)h(the)g(message)f(\015ag)g
1571 Fo(msgf)p Fn(.)29 b(If)19 b Fo(msgf)f Fn(is)h Fo(sockbuf::msg_oob)d
1572 Fn(and)240 1905 y(the)k(so)q(c)o(k)o(et)f(t)o(yp)q(e)g(of)g
1573 Fo(s)h Fn(is)g Fo(sockbuf::sock_stream)p Fn(,)d Fo(s)j Fn(sends)g(the)f
1574 (message)h(in)g Fi(out-of-band)240 1967 y Fn(mo)q(de.)38 b(If)22
1575 b Fo(msgf)f Fn(is)h Fo(sockbuf::msg_dontroute)p Fn(,)d Fo(s)i
1576 Fn(sends)h(the)f(outgoing)g(pac)o(k)o(ets)g(without)240 2029
1577 y(routing.)29 b(If)18 b Fo(msgf)g Fn(is)g(0,)g(whic)o(h)h(is)g(the)f(default)
1578 h(case,)g Fo(sockbuf::send)d Fn(b)q(eha)o(v)o(es)i(exactly)h(lik)o(e)240
1579 2092 y Fo(sockbuf::write)p Fn(.)0 2167 y Fo(s.sendto\(sa,)14
1580 b(buf,)g(bufsz,)g(msgf\))240 2243 y Fn(same)f(as)h Fo(sockbuf::send)d
1581 Fn(but)j(w)o(orks)f(on)g(unconnected)i(so)q(c)o(k)o(ets.)k
1582 Fo(sa)13 b Fn(sp)q(eci\014es)j(the)e Fi(to)h Fn(address)240
1583 2305 y(for)g(the)g(message.)0 2381 y Fo(s.sendmsg\(msgh,)e(msgf\))240
1584 2456 y Fn(same)i(as)g Fo(sockbuf::send)e Fn(but)i(sends)h(a)f
1585 Fo(struct)f(msghdr)h Fn(ob)s(ject)f(instead.)0 2532 y Fo(s.sys_write\(buf,)f
1586 (bufsz\))240 2608 y Fn(calls)e Fo(sockbuf::write)d Fn(and)j(returns)f(the)g
1587 (result.)19 b(Unlik)o(e)11 b Fo(sockbuf::write)d(sockbuf::sys_write)240
1588 2670 y Fn(is)16 b(declared)g(as)f(a)g(virtual)h(function.)p
1589 eop
1590 %%Page: 7 9
1591 bop 0 -58 a Fn(Chapter)15 b(2:)k Fo(sockbuf)c Fn(Class)1408
1592 b(7)0 183 y Fo(s.read\(buf,)14 b(bufsz\))240 258 y Fn(returns)h(an)g(in)o(t)h
1593 (whic)o(h)g(is)g(the)g(n)o(um)o(b)q(er)f(of)g(c)o(hars)g(read)g(in)o(to)h
1594 (the)f Fo(buf)p Fn(.)20 b(In)c(case)f(of)g(EOF,)g(return)240
1595 320 y(EOF.)c(Here,)h Fo(bufsz)f Fn(indicates)i(the)e(size)i(of)e(the)g
1596 Fo(buf)p Fn(.)19 b(In)12 b(case)f(of)g(timeouts,)h(return)f(0)h(Section)g
1597 (2.6)240 382 y([Timeouts],)i(page)h(11.)0 457 y Fo(s.recv\(buf,)f(bufsz,)g
1598 (msgf\))240 531 y Fn(same)20 b(as)g Fo(sockbuf::read)e Fn(describ)q(ed)23
1599 b(ab)q(o)o(v)o(e)c(but)i(allo)o(ws)f(the)h(user)f(to)g(receiv)o(e)h
1600 Fi(out-of-band)240 594 y Fn(data)14 b(if)h Fo(msgf)f Fn(is)h
1601 Fo(sockbuf::msg_oob)d Fn(or)i(to)g(preview)h(the)g(data)f(w)o(aiting)g(to)g
1602 (b)q(e)h(read)g(if)g Fo(msgf)e Fn(is)240 656 y Fo(sockbuf::msg_peek)p
1603 Fn(.)23 b(If)17 b Fo(msgf)f Fn(is)i(0,)f(whic)o(h)g(is)h(the)f(default)h
1604 (case,)f Fo(sockbuf::recv)e Fn(b)q(eha)o(v)o(es)240 718 y(exactly)h(lik)o(e)g
1605 Fo(sockbuf::read)p Fn(.)0 793 y Fo(s.recvfrom\(sa,)d(buf,)i(bufsz,)f(msgf\))
1606 240 867 y Fn(same)22 b(as)g Fo(sockbuf::recv)f Fn(but)i(w)o(orks)e(on)i
1607 (unconnected)g(so)q(c)o(k)o(ets.)42 b Fo(sa)22 b Fn(sp)q(eci\014es)i(the)f
1608 Fi(from)240 929 y Fn(address)15 b(for)g(the)g(message.)0 1004
1609 y Fo(s.recvmsg\(msgh,)e(msgf\))240 1078 y Fn(same)i(as)g Fo(sockbuf::recv)e
1610 Fn(but)i(reads)g(a)g Fo(struct)g(msghdr)f Fn(ob)s(ject)h(instead.)0
1611 1153 y Fo(s.sys_read\(buf,)e(bufsz\))240 1227 y Fn(calls)e
1612 Fo(sockbuf::read)e Fn(and)h(returns)g(the)g(result.)19 b(Unlik)o(e)11
1613 b Fo(sockbuf::read)e(sockbuf::sys_read)240 1290 y Fn(is)16
1614 b(declared)g(as)f(a)g(virtual)h(function.)0 1364 y Fo
1615 (s.is_readready\(wp_sec,)c(wp_usec\))240 1439 y Fn(returns)g(a)f(non-zero)i
1616 (in)o(t)f(if)g Fo(s)g Fn(has)g(data)f(w)o(aiting)h(to)g(b)q(e)g(read)g(from)f
1617 (the)h(comm)o(unication)h(c)o(hannel.)240 1501 y(If)h Fo(wp_sec)g(>=)h(0)p
1618 Fn(,)e(it)g(w)o(aits)g(for)g Fo(wp_sec)h(10^6)h(+)g(wp_usec)d
1619 Fn(microseconds)i(b)q(efore)f(returning)h(0)f(in)240 1563 y(case)j(there)h
1620 (are)f(no)h(data)e(w)o(aiting)i(to)f(b)q(e)h(read.)24 b(If)16
1621 b Fo(wp_sec)f(<)g(0)p Fn(,)h(then)h(it)g(w)o(aits)e(un)o(til)j(a)e(datum)240
1622 1625 y(arriv)o(es)f(at)g(the)g(comm)o(unication)h(c)o(hannel.)21
1623 b Fo(wp_usec)14 b Fn(defaults)i(to)e(0.)360 1700 y Fi(Please)19
1624 b(Note)s Fn(:)25 b(The)18 b(data)f(w)o(aiting)i(in)f Fo(sockbuf)p
1625 Fn('s)f(o)o(wn)h(bu\013er)g(is)g(di\013eren)o(t)h(from)360
1626 1750 y(the)c(data)g(w)o(aiting)g(in)h(the)f(comm)o(unication)h(c)o(hannel.)0
1627 1824 y Fo(s.is_writeready\(wp_sec,)c(wp_usec\))240 1899 y Fn(returns)19
1628 b(a)h(non-zero)f(in)o(t)h(if)g(data)f(can)h(b)q(e)g(written)f(on)o(to)g(the)g
1629 (comm)o(unication)i(c)o(hannel)f(of)g Fo(s)p Fn(.)240 1961
1630 y(If)f Fo(wp_sec)14 b(>=)h(0)p Fn(,)20 b(it)f(w)o(aits)f(for)g
1631 Fo(wp_sec)d(10^6)f(+)h(wp_usec)j Fn(microseconds)i(b)q(efore)f(returning)g(0)
1632 240 2023 y(in)e(case)g(no)g(data)f(can)g(b)q(e)i(written.)24
1633 b(If)17 b Fo(wp_sec)d(<)h(0)p Fn(,)i(then)g(it)g(w)o(aits)f(un)o(til)i(the)e
1634 (comm)o(unication)240 2086 y(c)o(hannel)g(is)g(ready)f(to)g(accept)g(data.)k
1635 Fo(wp_usec)c Fn(defaults)g(to)g(0.)360 2160 y Fi(Please)f(Note)s
1636 Fn(:)k(The)c(bu\013er)g(of)f(the)h Fo(sockbuf)e Fn(class)i(is)g(di\013eren)o
1637 (t)g(from)f(the)h(bu\013er)f(of)360 2210 y(the)i(comm)o(unication)h(c)o
1638 (hannel)h(bu\013er.)0 2284 y Fo(s.is_exceptionpending\(wp_s)o(ec,)12
1639 b(wp_usec\))240 2359 y Fn(returns)19 b(non-zero)g(in)o(t)f(if)i
1640 Fo(s)e Fn(has)h(an)o(y)f(exception)i(ev)o(en)o(ts)e(p)q(ending.)32
1641 b(If)19 b Fo(wp_sec)c(>=)g(0)p Fn(,)k(it)f(w)o(aits)240 2421
1642 y(for)g Fo(wp_sec)c(10^6)h(+)g(wp_usec)j Fn(microseconds)h(b)q(efore)g
1643 (returning)h(0)e(in)i(case)e Fo(s)h Fn(do)q(es)g(not)f(ha)o(v)o(e)240
1644 2483 y(an)o(y)f(exception)h(ev)o(en)o(ts)f(p)q(ending.)27 b(If)17
1645 b Fo(wp_sec)d(<)h(0)p Fn(,)i(then)h(it)f(w)o(aits)f(un)o(til)j(an)e(exp)q
1646 (ception)h(ev)o(en)o(t)240 2546 y(o)q(ccurs.)i Fo(wp_usec)14
1647 b Fn(defaults)i(to)f(0.)360 2620 y Fi(Please)26 b(Note)s Fn(:)40
1648 b(The)26 b(exceptions)h(that)e Fo(sockbuf::is_exceptionpen)o(ding)d
1649 Fn(is)360 2670 y(lo)q(oking)16 b(for)f(are)g(di\013eren)o(t)g(from)f(the)i(C)
1650 p Fo(++)e Fn(exceptions.)p eop
1651 %%Page: 8 10
1652 bop 0 -58 a Fn(Chapter)15 b(2:)k Fo(sockbuf)c Fn(Class)1408
1653 b(8)0 183 y Fo(s.flush_output\(\))240 259 y Fn(\015ushes)20
1654 b(the)f(output)g(bu\013er)g(and)g(returns)g(the)g(n)o(um)o(b)q(er)g(of)g(c)o
1655 (hars)f(\015ushed.)33 b(In)19 b(case)g(of)g(error,)240 321
1656 y(return)g(EOF.)h Fo(sockbuf::flush_output)c Fn(is)k(a)f(protected)h(mem)o(b)
1657 q(er)f(function)i(and)f(it)f(is)h(not)240 384 y(a)o(v)m(ailable)d(for)d
1658 (general)i(public.)0 459 y Fo(s.doallocate\(\))240 535 y Fn(allo)q(cates)i
1659 (free)g(store)f(for)g(read)g(and)h(write)g(bu\013ers)f(of)h
1660 Fo(s)f Fn(and)h(returns)f(1)h(if)g(allo)q(cation)g(is)h(done)240
1661 598 y(and)13 b(returns)g(0)g(if)h(there)f(is)h(no)f(need.)20
1662 b Fo(sockbuf::doallocate)10 b Fn(is)k(a)f(protected)g(virtual)h(mem)o(b)q(er)
1663 240 660 y(function)i(and)f(it)h(is)g(not)e(a)o(v)m(ailable)j(for)e(general)h
1664 (public.)0 736 y Fo(s.underflow\(\))240 811 y Fn(returns)21
1665 b(the)f(unread)i(c)o(har)e(in)i(the)e(bu\013er)h(as)g(an)f(unsigned)i(c)o
1666 (har)f(if)g(there)g(is)g(an)o(y)l(.)36 b(Else)22 b(re-)240
1667 874 y(turns)e(EOF)f(if)h Fo(s)g Fn(cannot)g(allo)q(cate)g(space)g(for)f(the)h
1668 (bu\013ers,)g(cannot)g(read)g(or)f(p)q(eer)h(is)g(closed.)240
1669 936 y Fo(sockbuf::underflow)11 b Fn(is)j(a)f(protected)g(virtual)h(mem)o(b)q
1670 (er)f(function)i(and)e(it)h(is)g(not)f(a)o(v)m(ailable)i(for)240
1671 998 y(general)h(public.)0 1074 y Fo(s.overflow\(c\))240 1150
1672 y Fn(if)23 b Fo(c==EOF)p Fn(,)f(call)h(and)g(return)f(the)g(result)g(of)g
1673 Fo(flush_output\(\))p Fn(,)g(else)h(if)f Fo(c=='\\n')f Fn(and)i
1674 Fo(s)e Fn(is)240 1212 y(linebu\013ered,)c(call)g Fo(flush_output\(\))c
1675 Fn(and)j(return)g Fo(c)f Fn(unless)i Fo(flush_output\(\))c
1676 Fn(returns)i(EOF,)240 1274 y(in)g(whic)o(h)g(case)f(return)g(EOF.)f(In)i(an)o
1677 (y)e(other)h(case,)g(insert)g(c)o(har)g Fo(c)g Fn(in)o(to)g(the)g(bu\013er)g
1678 (and)g(return)g Fo(c)240 1337 y Fn(as)h(an)h(unsigned)g(c)o(har.)21
1679 b Fo(sockbuf::overflow)13 b Fn(is)j(a)f(protected)h(mem)o(b)q(er)f(virtual)h
1680 (function)h(and)240 1399 y(it)e(is)h(not)f(a)o(v)m(ailable)i(for)d(general)i
1681 (public.)360 1475 y Fi(No)q(de:)k Fn(linebu\013ered)14 b(mo)q(de)f(do)q(es)g
1682 (not)f(w)o(ork)g(with)h(A)l(T&T)g(IOStream)g(library)l(.)20
1683 b(Use)360 1525 y(explicit)d(\015ushing)g(to)d(\015ush)i Fo(sockbuf)p
1684 Fn(.)0 1600 y Fo(s.sync\(\))48 b Fn(calls)22 b Fo(flush_output\(\))d
1685 Fn(and)i(returns)f(the)h(result.)38 b(Useful)21 b(if)h(the)f(user)g(needs)g
1686 (to)f(\015ush)i(the)240 1663 y(output)15 b(without)g(writing)h(newline)h(c)o
1687 (har)e(in)o(to)g(the)g(write)h(bu\013er.)0 1739 y Fo(s.xsputn\(buf,)d
1688 (bufsz\))240 1814 y Fn(write)h Fo(bufsz)f Fn(c)o(hars)g(in)o(to)h(the)g
1689 (bu\013er)g(and)g(returns)g(the)g(n)o(um)o(b)q(er)g(of)f(c)o(hars)h
1690 (successfully)h(written.)240 1877 y(Output)h(is)f(\015ushed)i(if)e(an)o(y)g
1691 (c)o(har)g(in)h Fo(buf[0..bufsz-1])d Fn(is)j Fo('\\n')p Fn(.)0
1692 1952 y Fo(s.recvtimeout\(wp\))240 2028 y Fn(sets)f(the)g(recv)h(timeout)f(to)
1693 f Fo(wp)h Fn(seconds.)20 b(If)c Fo(wp)f Fn(is)h(-1,)e(it)i(is)f(a)g(blo)q(c)o
1694 (k)h(and)g(if)f Fo(wp)g Fn(is)h(0,)e(it)i(is)f(a)g(p)q(oll.)240
1695 2104 y(It)f(a\013ects)f(all)j(read)e(functions.)20 b(If)14
1696 b(the)g(so)q(c)o(k)o(et)g(is)h(not)e(read)h(ready)g(within)i
1697 Fo(wp)d Fn(seconds,)i(the)f(read)240 2166 y(call)j(will)g(return)f(0.)21
1698 b(It)15 b(also)h(a\013ects)f Fo(sockbuf::underflow)p Fn(.)k
1699 Fo(sockbuf::underflow)13 b Fn(will)k(not)240 2229 y(set)e(the)g
1700 Fo(_S_EOF_SEEN)f Fn(\015ag)h(if)g(it)h(is)g(returning)f(EOF)g(b)q(ecause)i
1701 (of)d(timeout.)240 2304 y Fo(sockbuf::recvtimeout)e Fn(returns)j(the)h(old)g
1702 (recv)f(timeout)g(v)m(alue.)0 2380 y Fo(s.sendtimeout\(wp\))240
1703 2456 y Fn(sets)g(the)g(send)g(timeout)g(to)g Fo(wp)f Fn(seconds.)20
1704 b(If)c Fo(wp)e Fn(is)i(-1,)e(it)i(is)f(a)g(blo)q(c)o(k)g(and)h(if)f
1705 Fo(wp)g Fn(is)g(0,)g(it)g(is)g(a)g(p)q(oll.)240 2532 y(It)j(a\013ects)g(all)h
1706 (write)g(functions.)30 b(If)18 b(the)h(so)q(c)o(k)o(et)f(is)g(not)g(write)h
1707 (ready)f(within)i Fo(wp)e Fn(seconds,)h(the)240 2594 y(write)c(call)i(will)f
1708 (return)g(0.)240 2670 y Fo(sockbuf::sendtimeout)c Fn(returns)j(the)h(old)g
1709 (send)f(timeout)h(v)m(alue.)p eop
1710 %%Page: 9 11
1711 bop 0 -58 a Fn(Chapter)15 b(2:)k Fo(sockbuf)c Fn(Class)1408
1712 b(9)0 183 y Fm(2.4)33 b(Establishing)16 b(connections)62 320
1713 y Fn(A)11 b(name)g(m)o(ust)g(b)q(e)g(b)q(ound)h(to)f(a)f Fo(sockbuf)g
1714 Fn(if)i(pro)q(cesses)f(w)o(an)o(t)f(to)g(refer)h(to)f(it)i(and)f(use)g(it)g
1715 (for)g(comm)o(unication.)0 382 y(Names)i(m)o(ust)g(b)q(e)i(unique.)20
1716 b(A)14 b Fi(unix)k Fn(name)13 b(is)h(a)g(3-tuple,)g Fo(<)p
1717 Fi(proto)q(col,)f(lo)q(cal)i(path,)f(p)q(eer)g(path)p Fo(>)p
1718 Fn(.)19 b(An)14 b Fi(inet)h Fn(name)0 445 y(is)k(a)g(5-tuple,)h
1719 Fo(<)p Fi(proto)q(col,)f(lo)q(cal)g(addr,)h(lo)q(cal)f(p)q(ort,)g(p)q(eer)h
1720 (addr,)f(p)q(eer)g(p)q(ort)p Fo(>)p Fn(.)30 b Fo(sockbuf::bind)17
1721 b Fn(is)i(used)h(to)0 507 y(sp)q(ecify)h(the)g(lo)q(cal)g(half)f(of)g(the)g
1722 (name|)p Fo(<)p Fi(lo)q(cal)i(path)p Fo(>)d Fn(for)h Fi(unix)k
1723 Fn(and)c Fo(<)p Fi(lo)q(cal)h(addr,)g(lo)q(cal)h(p)q(ort)p
1724 Fo(>)d Fn(for)h Fi(inet)p Fn(.)0 569 y Fo(sockbuf::connect)d
1725 Fn(and)i Fo(sockbuf::accept)e Fn(are)i(used)h(to)f(sp)q(ecify)h(the)f(p)q
1726 (eer)h(half)g(of)f(the)g(name|)p Fo(<)p Fi(p)q(eer)0 632 y(path)p
1727 Fo(>)c Fn(for)f Fi(unix)20 b Fn(and)15 b Fo(<)p Fi(p)q(eer)h(addr,)f(p)q(eer)
1728 h(p)q(ort)p Fo(>)e Fn(for)h Fi(inet)p Fn(.)62 769 y(In)h(what)f(follo)o(ws,)
1729 25 906 y Fl(\000)30 b Fo(s)15 b Fn(and)g Fo(so)g Fn(are)g Fo(sockbuf)f
1730 Fn(ob)s(jects)25 978 y Fl(\000)30 b Fo(sa)15 b Fn(is)h(a)e
1731 Fo(sockAddr)h Fn(ob)s(ject)25 1051 y Fl(\000)30 b Fo(nc)15
1732 b Fn(is)h(an)f(in)o(teger)g(denoting)h(the)f(n)o(um)o(b)q(er)h(of)f
1733 (connections)h(to)e(allo)o(w)0 1188 y Fo(s.bind\(sa\))240 1260
1734 y Fn(binds)i Fo(sockAddr)f(sa)f Fn(as)h(the)g(lo)q(cal)i(half)e(of)g(the)h
1735 (name)f(for)f Fo(s)p Fn(.)0 1333 y Fo(s.connect\(sa\))240 1405
1736 y(sockbuf::connect)e Fn(uses)j Fo(sa)g Fn(to)f(pro)o(vide)h(the)g(p)q(eer)g
1737 (half)g(of)g(the)g(name)f(for)g Fo(s)h Fn(and)g(to)f(establish)240
1738 1467 y(the)23 b(connection)h(itself.)43 b Fo(sockbuf::connect)20
1739 b Fn(also)j(pro)o(vides)g(the)g(lo)q(cal)h(half)f(of)f(the)h(name)240
1740 1530 y(automatically)d(and)g(hence,)i(the)d(user)h(should)h(not)e(use)h
1741 Fo(sockbuf::bind)e Fn(to)h(bind)i(an)o(y)f(lo)q(cal)240 1592
1742 y(half)c(of)e(the)i(name.)0 1664 y Fo(s.listen\(nc\))240 1737
1743 y Fn(mak)o(es)c Fo(s)g Fn(ready)g(to)g(accept)g(connections.)20
1744 b Fo(nc)12 b Fn(sp)q(eci\014es)j(the)d(maxim)o(um)g(n)o(um)o(b)q(er)h(of)f
1745 (outstanding)240 1799 y(connections)22 b(that)e(ma)o(y)h(b)q(e)g(queued)i
1746 (and)e(m)o(ust)f(b)q(e)i(at)e(least)i(1)e(and)i(less)f(than)g(or)g(equal)h
1747 (to)240 1861 y Fo(sockbuf::somaxconn)13 b Fn(whic)o(h)j(is)f(usually)i(5)e
1748 (on)g(most)f(systems.)0 1934 y Fo(sockbuf)g(so)h(=)g(s.accept\(sa\))0
1749 1996 y(sockbuf)f(so)h(=)g(s.accept\(\))240 2069 y Fn(accepts)e(connections)h
1750 (and)g(returns)f(the)g(p)q(eer)h(address)f(in)h Fo(sa)p Fn(.)19
1751 b Fo(s)13 b Fn(m)o(ust)g(b)q(e)g(a)g(listening)i Fo(sockbuf)p
1752 Fn(.)240 2131 y(See)h Fo(sockbuf::listen)d Fn(ab)q(o)o(v)o(e.)0
1753 2346 y Fm(2.5)33 b(Getting)15 b(and)h(Setting)g(So)r(c)n(k)n(et)f(Options)62
1754 2483 y Fn(So)q(c)o(k)o(et)k(options)g(are)f(used)h(to)g(con)o(trol)f(a)g(so)q
1755 (c)o(k)o(et)h(comm)o(unication.)31 b(New)19 b(options)g(can)g(b)q(e)g(set)f
1756 (and)h(old)0 2545 y(v)m(alue)c(of)e(the)h(options)f(can)h(b)q(e)g(retriv)o
1757 (ed)g(at)f(the)h(proto)q(col)g(lev)o(el)g(or)g(at)e(the)i(so)q(c)o(k)o(et)f
1758 (lev)o(el)i(b)o(y)f(using)g Fo(setopt)f Fn(and)0 2608 y Fo(getopt)j
1759 Fn(mem)o(b)q(er)g(functions.)25 b(In)17 b(addition,)g(y)o(ou)g(can)f(also)h
1760 (use)f(sp)q(ecial)j(mem)o(b)q(er)d(functions)i(to)d(get)i(and)f(set)0
1761 2670 y(sp)q(eci\014c)h(options.)p eop
1762 %%Page: 10 12
1763 bop 0 -58 a Fn(Chapter)15 b(2:)k Fo(sockbuf)c Fn(Class)1386
1764 b(10)62 183 y(In)16 b(what)f(follo)o(ws,)25 323 y Fl(\000)30
1765 b Fo(s)15 b Fn(is)h(a)f Fo(sockbuf)f Fn(ob)s(ject)25 401 y
1766 Fl(\000)30 b Fo(opval)14 b Fn(is)i(an)f(in)o(teger)h(and)f(denotes)g(the)h
1767 (option)f(v)m(alue)25 479 y Fl(\000)30 b Fo(op)15 b Fn(is)h(of)e(t)o(yp)q(e)i
1768 Fo(sockbuf::option)d Fn(and)i(m)o(ust)g(b)q(e)h(one)f(of)127
1769 556 y Fl(\017)30 b Fo(sockbuf::so_error)13 b Fn(used)j(to)e(retriev)o(e)i
1770 (and)f(clear)h(error)e(status)127 634 y Fl(\017)30 b Fo(sockbuf::so_type)13
1771 b Fn(used)j(to)e(retriev)o(e)i(t)o(yp)q(e)f(of)g(the)g(so)q(c)o(k)o(et)127
1772 712 y Fl(\017)30 b Fo(sockbuf::so_debug)13 b Fn(is)j(used)f(to)g(sp)q(ecify)h
1773 (recording)g(of)f(debugging)h(information)127 789 y Fl(\017)30
1774 b Fo(sockbuf::so_reuseaddr)12 b Fn(is)k(used)g(to)e(sp)q(ecify)j(the)e(reuse)
1775 h(of)e(lo)q(cal)j(address)127 867 y Fl(\017)30 b Fo(sockbuf::so_keepalive)12
1776 b Fn(is)k(used)g(to)e(sp)q(ecify)j(whether)e(to)g(k)o(eep)g(connections)i
1777 (aliv)o(e)f(or)e(not)127 945 y Fl(\017)30 b Fo(sockbuf::so_dontroute)12
1778 b Fn(is)k(used)g(to)e(sp)q(ecify)j(whether)e(to)g(route)g(messages)f(or)h
1779 (not)127 1022 y Fl(\017)30 b Fo(sockbuf::so_broadcast)13 b
1780 Fn(is)k(used)g(to)e(sp)q(ecify)i(whether)g(to)e(broadcast)h
1781 Fo(sockbuf::sock_dgram)180 1084 y Fn(messages)f(or)f(not)127
1782 1162 y Fl(\017)30 b Fo(sockbuf::so_oobinline)12 b Fn(is)k(used)g(to)e(sp)q
1783 (ecify)j(whether)e(to)g(inline)j Fi(out-of-band)f Fn(data)d(or)h(not.)127
1784 1240 y Fl(\017)30 b Fo(sockbuf::so_linger)13 b Fn(is)i(used)h(to)f(sp)q
1785 (ecify)h(for)f(ho)o(w)g(long)g(to)g(linger)h(b)q(efore)f(sh)o(utting)h(do)o
1786 (wn)127 1317 y Fl(\017)30 b Fo(sockbuf::so_sndbuf)13 b Fn(is)i(used)h(to)f
1787 (retriev)o(e)g(and)g(to)g(set)g(the)g(size)h(of)f(the)g(send)g(bu\013er)h
1788 (\(comm)o(uni-)180 1380 y(cation)f(c)o(hannel)i(bu\013er)e(not)g
1789 Fo(sockbuf)p Fn('s)f(in)o(ternal)i(bu\013er\))127 1457 y Fl(\017)30
1790 b Fo(sockbuf::so_rcvbuf)13 b Fn(is)j(used)g(to)f(retriev)o(e)h(and)g(to)f
1791 (set)g(the)h(size)g(of)g(the)f(recv)h(bu\013er)g(\(comm)o(uni-)180
1792 1520 y(cation)f(c)o(hannel)i(bu\013er)e(not)g Fo(sockbuf)p
1793 Fn('s)f(in)o(ternal)i(bu\013er\))0 1660 y Fo(s.getopt\(op,)e(&opval,)g
1794 (sizeof\(opval\),)f(oplevel\))240 1737 y Fn(gets)f(the)h(option)g(v)m(alue)h
1795 (of)f(the)g Fo(sockbuf::option)e(op)h Fn(at)g(the)h(option)g(lev)o(el)i
1796 Fo(oplevel)c Fn(in)j Fo(opval)p Fn(.)240 1800 y(It)j(returns)f(the)h(actual)g
1797 (size)h(of)e(the)h(bu\013er)g Fo(opval)f Fn(used.)25 b(The)17
1798 b(default)g(v)m(alue)h(of)e(the)h Fo(oplevel)240 1862 y Fn(is)f
1799 Fo(sockbuf::sol_socket)p Fn(.)0 1940 y Fo(s.setopt\(op,)e(&opval,)g
1800 (sizeof\(opval\),)f(oplevel\))240 2017 y Fn(sets)g(the)g(option)g(v)m(alue)h
1801 (of)f(the)g Fo(sockbuf::option)e(op)i Fn(at)f(the)h(option)g(lev)o(el)i
1802 Fo(oplevel)d Fn(to)g Fo(opval)p Fn(.)240 2079 y(The)j(default)h(v)m(alue)h
1803 (of)d(the)i Fo(oplevel)e Fn(is)i Fo(sockbuf::sol_socket)p Fn(.)0
1804 2157 y Fo(s.gettype\(\))240 2235 y Fn(gets)f(the)g(so)q(c)o(k)o(et)g(t)o(yp)q
1805 (e)g(of)g Fo(s)p Fn(.)k(The)d(return)f(t)o(yp)q(e)g(is)h Fo(sockbuf::type)p
1806 Fn(.)0 2312 y Fo(s.clearerror\(\))240 2390 y Fn(gets)f(and)g(clears)h(the)f
1807 (error)f(status)h(of)g(the)g(so)q(c)o(k)o(et.)0 2468 y Fo(s.debug\(opval\))
1808 240 2545 y Fn(if)20 b Fo(opval)f Fn(is)h(not)f(-1,)h(set)f(the)g
1809 Fo(sockbuf::so_debug)e Fn(option)j(v)m(alue)h(to)d Fo(opval)p
1810 Fn(.)32 b(In)20 b(an)o(y)f(case,)240 2608 y(return)14 b(the)h(old)g(option)g
1811 (v)m(alue)g(of)f Fo(sockbuf::so_debug)e Fn(option.)20 b(The)15
1812 b(default)g(v)m(alue)h(of)e Fo(opval)240 2670 y Fn(is)i(-1.)p
1813 eop
1814 %%Page: 11 13
1815 bop 0 -58 a Fn(Chapter)15 b(2:)k Fo(sockbuf)c Fn(Class)1386
1816 b(11)0 183 y Fo(s.reuseaddr\(opval\))240 255 y Fn(if)14 b Fo(opval)e
1817 Fn(is)i(not)f(-1,)g(set)f(the)i Fo(sockbuf::so_reuseaddr)c
1818 Fn(option)j(v)m(alue)i(to)d Fo(opval)p Fn(.)19 b(In)13 b(an)o(y)g(case,)240
1819 317 y(return)k(the)h(old)g(option)g(v)m(alue)h(of)e Fo(sockbuf::so_reuseaddr)
1820 e Fn(option.)27 b(The)17 b(default)i(v)m(alue)f(of)240 380
1821 y Fo(opval)c Fn(is)i(-1.)0 452 y Fo(s.dontroute\(opval\))240
1822 523 y Fn(if)e Fo(opval)e Fn(is)i(not)f(-1,)g(set)f(the)i Fo
1823 (sockbuf::so_dontroute)c Fn(option)j(v)m(alue)i(to)d Fo(opval)p
1824 Fn(.)19 b(In)13 b(an)o(y)g(case,)240 586 y(return)k(the)h(old)g(option)g(v)m
1825 (alue)h(of)e Fo(sockbuf::so_dontroute)e Fn(option.)27 b(The)17
1826 b(default)i(v)m(alue)f(of)240 648 y Fo(opval)c Fn(is)i(-1.)0
1827 720 y Fo(s.oobinline\(opval\))240 792 y Fn(if)e Fo(opval)e
1828 Fn(is)i(not)f(-1,)g(set)f(the)i Fo(sockbuf::so_oobinline)c
1829 Fn(option)j(v)m(alue)i(to)d Fo(opval)p Fn(.)19 b(In)13 b(an)o(y)g(case,)240
1830 854 y(return)k(the)h(old)g(option)g(v)m(alue)h(of)e Fo(sockbuf::so_oobinline)
1831 e Fn(option.)27 b(The)17 b(default)i(v)m(alue)f(of)240 916
1832 y Fo(opval)c Fn(is)i(-1.)0 988 y Fo(s.broadcast\(opval\))240
1833 1060 y Fn(if)e Fo(opval)e Fn(is)i(not)f(-1,)g(set)f(the)i Fo
1834 (sockbuf::so_broadcast)c Fn(option)j(v)m(alue)i(to)d Fo(opval)p
1835 Fn(.)19 b(In)13 b(an)o(y)g(case,)240 1122 y(return)k(the)h(old)g(option)g(v)m
1836 (alue)h(of)e Fo(sockbuf::so_broadcast)e Fn(option.)27 b(The)17
1837 b(default)i(v)m(alue)f(of)240 1185 y Fo(opval)c Fn(is)i(-1.)0
1838 1257 y Fo(s.keepalive\(opval\))240 1328 y Fn(if)e Fo(opval)e
1839 Fn(is)i(not)f(-1,)g(set)f(the)i Fo(sockbuf::so_keepalive)c
1840 Fn(option)j(v)m(alue)i(to)d Fo(opval)p Fn(.)19 b(In)13 b(an)o(y)g(case,)240
1841 1391 y(return)k(the)h(old)g(option)g(v)m(alue)h(of)e Fo
1842 (sockbuf::so_keepalive)e Fn(option.)27 b(The)17 b(default)i(v)m(alue)f(of)240
1843 1453 y Fo(opval)c Fn(is)i(-1.)0 1525 y Fo(s.sendbufsz\(opval\))240
1844 1597 y Fn(if)i Fo(opval)e Fn(is)i(not)f(-1,)g(set)g(the)g(new)h(send)g
1845 (bu\013er)f(size)h(to)f Fo(opval)p Fn(.)25 b(In)18 b(an)o(y)f(case,)g(return)
1846 g(the)g(old)240 1659 y(bu\013er)e(size)h(of)f(the)g(send)h(bu\013er.)k(The)15
1847 b(default)h(v)m(alue)h(of)d Fo(opval)h Fn(is)h(-1.)0 1731 y
1848 Fo(s.recvbufsz\(opval\))240 1803 y Fn(if)i Fo(opval)f Fn(is)h(not)f(-1,)h
1849 (set)f(the)h(new)f(recv)h(bu\013er)g(size)g(to)f Fo(opval)p
1850 Fn(.)26 b(In)18 b(an)o(y)g(case,)f(return)h(the)f(old)240 1865
1851 y(bu\013er)e(size)h(of)f(the)g(recv)h(bu\013er.)k(The)15 b(default)h(v)m
1852 (alue)g(of)f Fo(opval)f Fn(is)i(-1.)0 1937 y Fo(s.linger\(tim\))240
1853 2009 y Fn(if)k Fo(tim)f Fn(is)h(p)q(ositiv)o(e,)h(set)f(the)f(linger)i(time)f
1854 (to)f(tim)g(seconds.)34 b(If)19 b Fo(tim)h Fn(is)g(0,)g(set)f(the)g(linger)i
1855 (o\013.)240 2071 y(In)c(an)o(y)g(case,)f(return)h(the)g(old)g(linger)h(time)f
1856 (if)g(it)g(w)o(as)f(set)g(earlier.)25 b(Otherwise)18 b(return)f(-1.)24
1857 b(The)240 2133 y(default)16 b(v)m(alue)g(of)f Fo(tim)g Fn(is)g(-1.)0
1858 2346 y Fm(2.6)33 b(Time)15 b(Outs)g(While)i(Reading)e(and)h(W)-6
1859 b(riting)62 2483 y Fn(Time)20 b(outs)f(are)g(v)o(ery)g(useful)i(in)f
1860 (handling)h(data)e(of)g(unkno)o(wn)g(sizes)h(and)g(formats)e(while)j(reading)
1861 f(and)0 2545 y(writing.)39 b(F)l(or)20 b(example,)k(ho)o(w)d(do)q(es)g(one)h
1862 (comm)o(unicate)f(with)h(a)f(so)q(c)o(k)o(et)g(that)f(sends)i(c)o(h)o(unks)g
1863 (of)f(data)f(of)0 2608 y(unkno)o(wn)11 b(size)h(and)f(format?)18
1864 b(If)11 b(only)h Fo(sockbuf::read)d Fn(is)i(used)h(without)f(time)g(out,)g
1865 (it)g(will)i(blo)q(c)o(k)e(inde\014nitely)l(.)0 2670 y(In)16
1866 b(suc)o(h)f(cases,)g(time)h(out)e(facilit)o(y)j(is)e(the)h(only)f(answ)o(er.)
1867 p eop
1868 %%Page: 12 14
1869 bop 0 -58 a Fn(Chapter)15 b(2:)k Fo(sockbuf)c Fn(Class)1386
1870 b(12)62 183 y(The)13 b(follo)o(wing)h(idiom)g(is)g(recommended.)20
1871 b(See)13 b(Chapter)g(15)f([Pitfalls],)i(page)e(48)h(for)f(a)h(complete)g
1872 (example.)215 320 y Fo(int)24 b(old_tmo)f(=)h(s.recvtimeout)e(\(2\))h(//)h
1873 (set)f(time)g(out)h(\(2)f(seconds)g(here\))215 370 y(for)h(\(;;\))f({)h(//)g
1874 (read)f(or)g(write)311 420 y(char)g(buf[256];)311 470 y(int)g(rval)h(=)f
1875 (s.read)g(\(buf,)h(256\);)311 519 y(if)f(\(rval)h(==)f(0)h(||)g(rval)f(==)g
1876 (EOF\))h(break;)311 569 y(//)f(process)g(buf)h(here)215 619
1877 y(})215 669 y(s.recvtimeout)f(\(old_tmo\);)f(//)i(reset)f(time)g(out)62
1878 881 y Fn(In)16 b(what)f(follo)o(ws,)25 1018 y Fl(\000)30 b
1879 Fo(s)15 b Fn(is)h(a)f Fo(sockbuf)f Fn(ob)s(ject)25 1092 y Fl(\000)30
1880 b Fo(wp)15 b Fn(is)h(w)o(aiting)f(p)q(erio)q(d)h(in)h(seconds)0
1881 1229 y Fo(s.recvtimeout\(wp\))240 1304 y Fn(sets)e(the)g(recv)h(timeout)f(to)
1882 f Fo(wp)h Fn(seconds.)20 b(If)c Fo(wp)f Fn(is)h(-1,)e(it)i(is)f(a)g(blo)q(c)o
1883 (k)h(and)g(if)f Fo(wp)g Fn(is)h(0,)e(it)i(is)f(a)g(p)q(oll.)240
1884 1379 y(It)f(a\013ects)f(all)j(read)e(functions.)20 b(If)14
1885 b(the)g(so)q(c)o(k)o(et)g(is)h(not)e(read)h(ready)g(within)i
1886 Fo(wp)d Fn(seconds,)i(the)f(read)240 1441 y(call)j(will)g(return)f(0.)21
1887 b(It)15 b(also)h(a\013ects)f Fo(sockbuf::underflow)p Fn(.)k
1888 Fo(sockbuf::underflow)13 b Fn(will)k(not)240 1503 y(set)e(the)g
1889 Fo(_S_EOF_SEEN)f Fn(\015ag)h(if)g(it)h(is)g(returning)f(EOF)g(b)q(ecause)i
1890 (of)d(timeout.)240 1578 y Fo(sockbuf::recvtimeout)e Fn(returns)j(the)h(old)g
1891 (recv)f(timeout)g(v)m(alue.)0 1653 y Fo(s.sendtimeout\(wp\))240
1892 1727 y Fn(sets)g(the)g(send)g(timeout)g(to)g Fo(wp)f Fn(seconds.)20
1893 b(If)c Fo(wp)e Fn(is)i(-1,)e(it)i(is)f(a)g(blo)q(c)o(k)g(and)h(if)f
1894 Fo(wp)g Fn(is)g(0,)g(it)g(is)g(a)g(p)q(oll.)240 1802 y(It)j(a\013ects)g(all)h
1895 (write)g(functions.)30 b(If)18 b(the)h(so)q(c)o(k)o(et)f(is)g(not)g(write)h
1896 (ready)f(within)i Fo(wp)e Fn(seconds,)h(the)240 1864 y(write)c(call)i(will)f
1897 (return)g(0.)240 1939 y Fo(sockbuf::sendtimeout)c Fn(returns)j(the)h(old)g
1898 (send)f(timeout)h(v)m(alue.)p eop
1899 %%Page: 13 15
1900 bop 0 -58 a Fn(Chapter)15 b(3:)k(so)q(c)o(kAddr)d(Class)1366
1901 b(13)0 183 y Fk(3)41 b(so)r(c)n(kAddr)14 b(Class)62 370 y Fn(Class)h
1902 Fo(sockAddr)f Fn(is)i(an)f(abstract)f(base)h(class)g(for)g(all)h(so)q(c)o(k)o
1903 (et)e(address)i(classes.)k(That)14 b(is,)i(domain)f(sp)q(eci\014c)0
1904 432 y(so)q(c)o(k)o(et)g(address)g(classes)h(are)e(all)j(deriv)o(ed)f(from)e
1905 Fo(sockAddr)g Fn(class.)120 569 y Fi(Note)s Fn(:)22 b Fo(sockAddr)15
1906 b Fn(is)i(not)f(sp)q(elled)j Fo(sockaddr)c Fn(in)j(order)e(to)g(prev)o(en)o
1907 (t)g(name)h(clash)g(with)g Fo(struct)120 619 y(sockaddr)d Fn(declared)i(in)h
1908 (`)p Fo(<sys/socket.h>)p Fn('.)62 831 y(Non-abstract)e(deriv)o(ed)h(classes)g
1909 (m)o(ust)e(ha)o(v)o(e)h(de\014nitions)i(for)d(the)i(follo)o(wing)g
1910 (functions.)0 968 y Fo(sockAddr::operator)d(void*)h(\(\))240
1911 1043 y Fn(should)i(simply)h(return)e Fo(this)p Fn(.)0 1117
1912 y Fo(sockAddr::size\(\))240 1192 y Fn(should)h(return)f Fo(sizeof\(*this\))p
1913 Fn(.)j(The)e(return)f(t)o(yp)q(e)g(is)h Fo(int)p Fn(.)0 1267
1914 y Fo(sockAddr::family\(\))240 1341 y Fn(should)g(return)f(address)f(family)i
1915 (\(domain)f(name\))f(of)h(the)g(so)q(c)o(k)o(et)f(address.)20
1916 b(The)15 b(return)g(t)o(yp)q(e)f(is)240 1404 y Fo(int)p eop
1917 %%Page: 14 16
1918 bop 0 -58 a Fn(Chapter)15 b(4:)k(so)q(c)o(kinetbuf)e(Class)1328
1919 b(14)0 183 y Fk(4)41 b(so)r(c)n(kinetbuf)13 b(Class)62 377
1920 y Fo(sockinetbuf)k Fn(class)h(is)h(deriv)o(ed)g(from)e Fo(sockbuf)g
1921 Fn(class)h(and)g(inherits)i(most)d(of)g(the)h(public)j(functions)d(of)0
1922 439 y Fo(sockbuf)p Fn(.)i(See)c(Chapter)f(2)g([so)q(c)o(kbuf)g(Class],)g
1923 (page)g(4,)g(for)g(more)g(information)g(on)h Fo(sockbuf)p Fn(.)j(In)d
1924 (addition,)h(it)0 502 y(pro)o(vides)d(metho)q(ds)h(for)e(getting)h
1925 Fo(sockinetaddr)e Fn(of)i(lo)q(cal)h(and)f(p)q(eer)h(connections.)20
1926 b(See)15 b(Chapter)f(5)f([so)q(c)o(kine-)0 564 y(taddr)i(Class],)f(page)h
1927 (19,)g(for)f(more)h(information)g(on)g Fo(sockinetaddr)p Fn(.)0
1928 801 y Fm(4.1)33 b(Metho)r(ds)62 940 y Fn(In)16 b(what)f(follo)o(ws,)25
1929 1078 y Fl(\000)30 b Fo(ty)15 b Fn(denotes)g(the)h(t)o(yp)q(e)f(of)g(the)g(so)
1930 q(c)o(k)o(et)f(connection)j(and)e(is)h(of)f(t)o(yp)q(e)g Fo(sockbuf::type)25
1931 1154 y Fl(\000)30 b Fo(proto)14 b Fn(denotes)i(the)f(proto)q(col)g(and)h(is)f
1932 (of)g(t)o(yp)q(e)g(in)o(t)25 1230 y Fl(\000)30 b Fo(si,)15
1933 b(ins)f Fn(are)h Fo(sockbuf)g Fn(ob)s(jects)f(and)i(are)e(in)i
1934 Fi(inet)h Fn(domain)25 1306 y Fl(\000)30 b Fo(adr)15 b Fn(denotes)g(an)g
1935 Fi(inet)i Fn(address)e(in)h(host)f(b)o(yte)g(order)g(and)h(is)f(of)g(t)o(yp)q
1936 (e)g(unsigned)i(long)25 1383 y Fl(\000)30 b Fo(serv)15 b Fn(denotes)g(a)g
1937 (service)h(lik)o(e)g Fo(")p Fn(nn)o(tp)p Fo(")f Fn(and)h(is)f(of)g(t)o(yp)q
1938 (e)g(c)o(har*)25 1459 y Fl(\000)30 b Fo(proto)14 b Fn(denotes)i(a)f(proto)q
1939 (col)g(lik)o(e)h Fo(")p Fn(tcp)p Fo(")f Fn(and)h(is)f(of)g(t)o(yp)q(e)g(c)o
1940 (har*)25 1535 y Fl(\000)30 b Fo(thostname)13 b Fn(is)i(of)e(t)o(yp)q(e)i(c)o
1941 (har*)e(and)i(denotes)f(the)g(name)h(of)e(a)h(host)g(lik)o(e)h
1942 Fo("kelvin.acc.virginia.edu")90 1597 y Fn(or)g Fo("128.143.24.31")p
1943 Fn(.)25 1673 y Fl(\000)30 b Fo(portno)14 b Fn(denotes)i(a)f(p)q(ort)f(in)j
1944 (host)d(b)o(yte)h(order)g(and)h(is)f(of)g(t)o(yp)q(e)g(in)o(t)0
1945 1812 y Fo(sockinetbuf)f(ins\(ty,)g(proto\))240 1888 y Fn(Constructs)21
1946 b(a)g Fo(sockinetbuf)e Fn(ob)s(ject)i Fo(ins)g Fn(whose)g(so)q(c)o(k)o(et)g
1947 (comm)o(unication)h(t)o(yp)q(e)g(is)g Fo(ty)f Fn(and)240 1950
1948 y(proto)q(col)15 b(is)h Fo(proto)p Fn(.)j Fo(proto)14 b Fn(defaults)i(to)f
1949 (0.)0 2026 y Fo(sockinetbuf)f(ins\(si\))240 2102 y Fn(Constructs)g(a)h
1950 Fo(sockinetbuf)f Fn(ob)s(ject)h Fo(ins)f Fn(whic)o(h)i(uses)g(the)f(same)g
1951 (so)q(c)o(k)o(et)g(as)f Fo(si)h Fn(uses.)0 2179 y Fo(ins)g(=)g(si)66
1952 b Fn(p)q(erforms)17 b(the)h(same)g(function)g(as)f Fo(sockbuf::operator=)p
1953 Fn(.)25 b(See)18 b(Chapter)g(2)f([so)q(c)o(kbuf)h(Class],)240
1954 2241 y(page)d(4,)g(for)f(more)h(details.)0 2317 y Fo(ins.open\(ty,)f(proto\))
1955 240 2393 y Fn(create)g(a)f(new)h Fo(sockinetbuf)e Fn(whose)i(t)o(yp)q(e)g
1956 (and)g(proto)q(col)f(are)h Fo(ty)f Fn(and)h Fo(proto)f Fn(resp)q(ectiv)o(ely)
1957 j(and)240 2455 y(assign)f(it)h(to)e Fo(ins)p Fn(.)0 2532 y
1958 Fo(sockinetaddr)g(sina)g(=)h(ins.localaddr\(\))240 2608 y Fn(returns)f(the)f
1959 (lo)q(cal)i Fi(inet)h Fn(address)e(of)f(the)h Fo(sockinetbuf)e
1960 Fn(ob)s(ject)h Fo(ins)p Fn(.)19 b(The)14 b(call)h(will)g(mak)o(e)e(sense)240
1961 2670 y(only)j(after)e(a)h(call)h(to)f(either)h Fo(sockbuf::bind)d
1962 Fn(or)i Fo(sockbuf::connect)p Fn(.)p eop
1963 %%Page: 15 17
1964 bop 0 -58 a Fn(Chapter)15 b(4:)k(so)q(c)o(kinetbuf)e(Class)1328
1965 b(15)0 183 y Fo(sockinetaddr)14 b(sina)g(=)h(ins.peeraddr\(\))240
1966 255 y Fn(returns)f(the)h(p)q(eer)g Fi(inet)h Fn(address)e(of)g(the)g
1967 Fo(sockinetbuf)f Fn(ob)s(ject)h Fo(ins)p Fn(.)19 b(The)14 b(call)i(will)g
1968 (mak)o(e)d(sense)240 318 y(only)j(after)e(a)h(call)h(to)f Fo
1969 (sockbuf::connect)p Fn(.)0 390 y Fo(const)f(char*)h(hn)g(=)g
1970 (ins.localhost\(\))240 462 y Fn(returns)j(the)f(lo)q(cal)i
1971 Fi(inet)g Fn(thostname)e(of)h(the)f Fo(sockinetbuf)g Fn(ob)s(ject)g
1972 Fo(ins)p Fn(.)26 b(The)18 b(call)h(will)g(mak)o(e)240 524 y(sense)d(only)f
1973 (after)g(a)g(call)h(to)f(either)h Fo(sockbuf::bind)d Fn(or)i
1974 Fo(sockbuf::connect)p Fn(.)0 596 y Fo(const)f(char*)h(hn)g(=)g
1975 (ins.peerhost\(\))240 668 y Fn(returns)j(the)g(p)q(eer)h Fi(inet)h
1976 Fn(thostname)d(of)h(the)g Fo(sockinetbuf)f Fn(ob)s(ject)h Fo(ins)p
1977 Fn(.)28 b(The)18 b(call)i(will)f(mak)o(e)240 730 y(sense)d(only)f(after)g(a)g
1978 (call)h(to)f Fo(sockbuf::connect)p Fn(.)0 802 y Fo(int)g(pn)g(=)g
1979 (ins.localport\(\))240 875 y Fn(returns)26 b(the)g(lo)q(cal)h
1980 Fi(inet)h Fn(p)q(ort)d(n)o(um)o(b)q(er)i(of)e(the)h Fo(sockinetbuf)f
1981 Fn(ob)s(ject)g Fo(ins)h Fn(in)h(host)e(b)o(yte)240 937 y(order.)59
1982 b(The)28 b(call)i(will)g(mak)o(e)e(sense)g(only)h(after)f(a)g(call)h(to)f
1983 (either)h Fo(sockbuf::bind)d Fn(or)240 999 y Fo(sockbuf::connect)p
1984 Fn(.)0 1071 y Fo(int)15 b(pn)g(=)g(ins.peerport\(\))240 1143
1985 y Fn(returns)j(the)g(p)q(eer)h Fi(inet)h Fn(p)q(ort)d(n)o(um)o(b)q(er)i(of)f
1986 (the)g Fo(sockinetbuf)e Fn(ob)s(ject)i Fo(ins)f Fn(in)i(lo)q(cal)h(host)d(b)o
1987 (yte)240 1205 y(order.)j(The)15 b(call)h(will)h(mak)o(e)e(sense)h(only)f
1988 (after)g(a)g(call)h(to)f Fo(sockbuf::connect)p Fn(.)0 1278
1989 y Fo(ins.bind)f(\(\))240 1350 y Fn(binds)i Fo(ins)f Fn(to)g(the)g(default)h
1990 (address)f Fi(INADDR)p 1087 1350 14 2 v 17 w(ANY)22 b Fn(and)15
1991 b(the)g(default)h(p)q(ort.)0 1422 y Fo(ins.bind)e(\(adr,)h(portno\))240
1992 1494 y Fn(binds)h Fo(ins)f Fn(to)g(the)g(address)g Fo(adr)g
1993 Fn(and)g(the)h(p)q(ort)f Fo(portno)p Fn(.)0 1566 y Fo(ins.bind)f(\(adr,)h
1994 (serv,)f(proto\))240 1638 y Fn(binds)j Fo(ins)e Fn(to)f(the)i(address,)f
1995 Fo(adr)g Fn(and)h(the)f(p)q(ort)g(corresp)q(onding)i(to)e(the)g(service)h
1996 Fo(serv)f Fn(and)h(the)240 1700 y(proto)q(col)f Fo(proto>)p
1997 Fn(.)0 1772 y Fo(ins.bind)f(\(thostname,)g(portno\))240 1844
1998 y Fn(binds)24 b Fo(ins)f Fn(to)f(the)h(address)g(corresp)q(onding)h(to)f(the)
1999 g(hostname)f Fo(thostname)g Fn(and)h(the)g(p)q(ort)240 1907
2000 y Fo(portno)p Fn(.)0 1979 y Fo(ins.bind)14 b(\(thostname,)g(serv,)g(proto\))
2001 240 2051 y Fn(binds)j Fo(ins)e Fn(to)f(the)i(address)f(corresp)q(onding)i(to)
2002 d(the)i(hostname)f Fo(thostname)f Fn(and)i(the)f(p)q(ort)g(cor-)240
2003 2113 y(resp)q(onding)h(to)f(the)g(service)h Fo(serv)f Fn(and)g(the)h(proto)q
2004 (col)f Fo(proto>)p Fn(.)0 2185 y Fo(ins.connect)f(\(adr,)g(portno\))240
2005 2257 y Fn(connects)i Fo(ins)e Fn(to)h(the)g(address)g Fo(adr)g
2006 Fn(and)h(the)f(p)q(ort)g Fo(portno)p Fn(.)0 2329 y Fo(ins.connect)f(\(adr,)g
2007 (serv,)h(proto\))240 2401 y Fn(connects)i Fo(ins)f Fn(to)g(the)g(address,)h
2008 Fo(adr)f Fn(and)h(the)f(p)q(ort)g(corresp)q(onding)i(to)e(the)g(service)i
2009 Fo(serv)e Fn(and)240 2464 y(the)f(proto)q(col)g Fo(proto>)p
2010 Fn(.)0 2536 y Fo(ins.connect)f(\(thostname,)f(portno\))240
2011 2608 y Fn(connects)18 b Fo(ins)f Fn(to)h(the)f(address)h(corresp)q(onding)h
2012 (to)e(the)h(hostname)f Fo(thostname)g Fn(and)g(the)h(p)q(ort)240
2013 2670 y Fo(portno)p Fn(.)p eop
2014 %%Page: 16 18
2015 bop 0 -58 a Fn(Chapter)15 b(4:)k(so)q(c)o(kinetbuf)e(Class)1328
2016 b(16)0 183 y Fo(ins.connect)14 b(\(thostname,)f(serv,)i(proto\))240
2017 259 y Fn(connects)j Fo(ins)f Fn(to)h(the)f(address)h(corresp)q(onding)h(to)e
2018 (the)h(hostname)f Fo(thostname)g Fn(and)g(the)h(p)q(ort)240
2019 321 y(corresp)q(onding)e(to)f(the)g(service)h Fo(serv)f Fn(and)g(the)g(proto)
2020 q(col)h Fo(proto>)p Fn(.)0 554 y Fm(4.2)33 b Fh(inet)15 b Fm(Datagram)f(So)r
2021 (c)n(k)n(ets)62 692 y Fn(The)i(follo)o(wing)h(t)o(w)o(o)d(programs)h
2022 (illustrates)i(ho)o(w)e(to)g(use)h Fo(sockinetbuf)e Fn(class)i(for)g
2023 (datagram)e(connection)0 754 y(in)20 b Fi(inet)g Fn(domain.)32
2024 b Fo(tdinread.cc)17 b Fn(also)i(sho)o(ws)f(ho)o(w)h(to)f(use)h
2025 Fo(isockinet)f Fn(class)h(and)g Fo(tdinwrite.cc)f Fn(sho)o(ws)0
2026 816 y(ho)o(w)d(to)f(use)i Fo(osockinet)e Fn(class.)0 1032 y
2027 Fg(tdinread.cc)120 1170 y Fo(//)24 b(reads)f(data)g(sent)g(by)h(tdinwrite.cc)
2028 120 1220 y(#include)f(<sockinet.h>)120 1320 y(int)g(main\(int)g(ac,)h(char**)
2029 f(av\))120 1370 y({)311 1419 y(isockinet)46 b(is)24 b
2030 (\(sockbuf::sock_dgram\);)311 1469 y(is->bind\(\);)311 1569
2031 y(cout)f(<<)h("localhost)e(=)i(")g(<<)f(so.localhost\(\))f(<<)i(endl)430
2032 1619 y(<<)g("localport)e(=)i(")g(<<)f(so.localport\(\))f(<<)i(endl;)311
2033 1718 y(char)214 b(buf[256];)311 1768 y(int)238 b(n;)311 1868
2034 y(is)23 b(>>)h(n;)311 1917 y(cout)f(<<)h(av[0])f(<<)h(":)f(";)311
2035 1967 y(while\(n--\))f({)502 2017 y(is)h(>>)h(buf;)502 2067
2036 y(cout)f(<<)h(buf)f(<<)h(')f(';)311 2117 y(})311 2167 y(cout)g(<<)h(endl;)311
2037 2266 y(return)f(0;)120 2316 y(})0 2532 y Fg(tdin)n(write.cc)120
2038 2670 y Fo(//)h(sends)f(data)g(to)h(tdinread.cc)p eop
2039 %%Page: 17 19
2040 bop 0 -58 a Fn(Chapter)15 b(4:)k(so)q(c)o(kinetbuf)e(Class)1328
2041 b(17)120 183 y Fo(#include)23 b(<sockinetbuf.h>)120 233 y(#include)g
2042 (<stdlib.h>)120 333 y(int)g(main\(int)g(ac,)h(char**)f(av\))120
2043 382 y({)311 432 y(if)g(\(ac)h(<)g(3\))f({)502 482 y(cerr)g(<<)h("USAGE:)f(")g
2044 (<<)h(av[0])f(<<)h(")f(thostname)g(port-number)f(")621 532
2045 y(<<)i("data)f(...)g(")h(<<)g(endl;)502 582 y(return)f(1;)311
2046 632 y(})311 731 y(osockinet)g(os)g(\(sockbuf::sock_dgram\);)311
2047 781 y(os->connect)f(\(av[1],)h(atoi\(av[2]\)\);)311 881 y(cout)g(<<)h
2048 ("local:)f(")g(<<)h(so.localport\(\))e(<<)i(')f(')740 930 y(<<)h
2049 (so.localhost\(\))e(<<)i(endl)430 980 y(<<)g("peer:)47 b(")23
2050 b(<<)h(so.peerport\(\))e(<<)i(')f(')740 1030 y(<<)h(so.peerhost\(\))e(<<)i
2051 (endl;)311 1130 y(os)f(<<)h(ac-3;)f(av)h(+=)f(3;)311 1180 y(while\(*av\))f
2052 (os)i(<<)g(*av++)f(<<)g(')h(';)311 1229 y(os)f(<<)h(endl;)311
2053 1329 y(return)f(0;)120 1379 y(})0 1664 y Fm(4.3)33 b Fh(inet)15
2054 b Fm(Stream)g(So)r(c)n(k)n(ets)62 1802 y Fn(The)j(follo)o(wing)g(t)o(w)o(o)e
2055 (programs)h(illustrates)h(the)g(use)f(of)g Fo(sockinetbuf)f
2056 Fn(class)i(for)f(stream)g(connection)h(in)0 1865 y Fi(inet)f
2057 Fn(domain.)j(It)15 b(also)h(sho)o(ws)e(ho)o(w)h(to)f(use)i
2058 Fo(iosockinet)e Fn(class.)0 2083 y Fg(tsinread.cc)120 2222
2059 y Fo(//)24 b(receives)e(strings)h(from)h(tsinwrite.cc)e(and)h(sends)g(the)h
2060 (strlen)120 2271 y(//)g(of)f(each)g(string)h(back)f(to)g(tsinwrite.cc)120
2061 2321 y(#include)190 b(<sockinet.h>)120 2421 y(int)23 b(main\(\))120
2062 2471 y({)311 2521 y(sockinetbuf)118 b(si\(sockbuf::sock_stream\))o(;)311
2063 2570 y(si.bind\(\);)311 2670 y(cout)23 b(<<)h(si.localhost\(\))e(<<)h(')h(')g
2064 (<<)f(si.localport\(\))f(<<)i(endl;)p eop
2065 %%Page: 18 20
2066 bop 0 -58 a Fn(Chapter)15 b(4:)k(so)q(c)o(kinetbuf)e(Class)1328
2067 b(18)311 183 y Fo(si.listen\(\);)311 283 y(iosockinet)22 b(s)i(=)g
2068 (si.accept\(\);)311 333 y(char)238 b(buf[1024];)311 432 y(while)23
2069 b(\(s)h(>>)f(buf\))h({)502 482 y(cout)f(<<)h(buf)f(<<)h(')f(';)502
2070 532 y(s)h(<<)f(::strlen\(buf\))f(<<)i(endl;)311 582 y(})311
2071 632 y(cout)f(<<)h(endl;)311 731 y(return)f(0;)120 781 y(})0
2072 989 y Fg(tsin)n(write.cc)120 1126 y Fo(//)h(sends)f(strings)g(to)g
2073 (tsinread.cc)g(and)g(gets)g(back)h(their)f(length)120 1175
2074 y(//)h(usage:)f(tsinwrite)f(hostname)h(portno)120 1225 y(//)191
2075 b(see)23 b(the)h(output)f(of)g(tsinread)g(for)g(what)h(hostname)e(and)i
2076 (portno)f(to)h(use)120 1325 y(#include)190 b(<sockinet.h>)120
2077 1375 y(#include)g(<stdlib.h>)120 1474 y(int)23 b(main\(int)g(ac,)h(char**)f
2078 (av\))120 1524 y({)311 1574 y(iosockinet)f(sio)i(\(sockbuf::sock_stream\);)
2079 311 1624 y(sio->connect)e(\(av[1],)h(atoi)g(\(av[2]\)\);)311
2080 1723 y(sio)g(<<)h("Hello!)f(This)g(is)h(a)f(test\\n")g(<<)h(flush;)311
2081 1823 y(//)f(terminate)g(the)h(while)f(loop)g(in)h(tsinread.cc)311
2082 1873 y(si.shutdown\(sockbuf::shut)o(_write\);)311 1972 y(int)f(len;)311
2083 2022 y(while)g(\(s)h(>>)f(len\))h(cout)f(<<)g(len)h(<<)g(')f(';)311
2084 2072 y(cout)g(<<)h(endl;)311 2172 y(return)f(0;)120 2221 y(})p
2085 eop
2086 %%Page: 19 21
2087 bop 0 -58 a Fn(Chapter)15 b(5:)k(so)q(c)o(kinetaddr)d(Class)1302
2088 b(19)0 183 y Fk(5)41 b(so)r(c)n(kinetaddr)14 b(Class)62 369
2089 y Fn(Class)c Fo(sockinetaddr)f Fn(is)i(deriv)o(ed)g(from)e
2090 Fo(sockAddr)g Fn(declared)i(in)g Fo(<sockstream.h>)e Fn(and)h(from)f
2091 Fo(sockaddr_in)0 432 y Fn(declared)17 b(in)f Fo(<netinet/in.h>)p
2092 Fn(.)i(Alw)o(a)o(ys)d(use)g(a)g Fo(sockinetaddr)f Fn(ob)s(ject)h(for)f(an)i
2093 (address)f(with)h Fi(inet)h Fn(domain)0 494 y(of)e(so)q(c)o(k)o(ets.)k(See)d
2094 (Section)g(2.4)e([Connection)i(Establishmen)o(t],)f(page)g(9.)62
2095 631 y(In)h(what)f(follo)o(ws,)25 768 y Fl(\000)30 b Fo(adr)15
2096 b Fn(denotes)g(an)g Fi(inet)i Fn(address)e(in)h(host)f(b)o(yte)g(order)g(and)
2097 h(is)f(of)g(t)o(yp)q(e)g(unsigned)i(long)25 842 y Fl(\000)30
2098 b Fo(serv)15 b Fn(denotes)g(a)g(service)h(lik)o(e)g Fo(")p
2099 Fn(nn)o(tp)p Fo(")f Fn(and)h(is)f(of)g(t)o(yp)q(e)g(c)o(har*)25
2100 917 y Fl(\000)30 b Fo(proto)14 b Fn(denotes)i(a)f(proto)q(col)g(lik)o(e)h
2101 Fo(")p Fn(tcp)p Fo(")f Fn(and)h(is)f(of)g(t)o(yp)q(e)g(c)o(har*)25
2102 991 y Fl(\000)30 b Fo(thostname)13 b Fn(is)i(of)e(t)o(yp)q(e)i(c)o(har*)e
2103 (and)i(denotes)f(the)g(name)h(of)e(a)h(host)g(lik)o(e)h Fo
2104 ("kelvin.acc.virginia.edu")90 1054 y Fn(or)g Fo("128.143.24.31")p
2105 Fn(.)25 1128 y Fl(\000)30 b Fo(portno)14 b Fn(denotes)i(a)f(p)q(ort)f(in)j
2106 (host)d(b)o(yte)h(order)g(and)h(is)f(of)g(t)o(yp)q(e)g(in)o(t)0
2107 1265 y Fo(sockinetaddr)f(sina)240 1340 y Fn(Constructs)g(a)h
2108 Fo(sockinetaddr)e Fn(ob)s(ject)h Fo(sina)g Fn(with)i(default)f(address)g
2109 Fi(INADDR)p 1664 1340 14 2 v 17 w(ANY)21 b Fn(and)15 b(de-)240
2110 1402 y(fault)g(p)q(ort)g(n)o(um)o(b)q(er)h(0.)0 1477 y Fo(sockinetaddr)e
2111 (sina\(adr,)f(portno\))240 1551 y Fn(Constructs)g(a)g Fo(sockinetaddr)f
2112 Fn(ob)s(ject)h Fo(sina)g Fn(setting)g(inet)i(address)e(to)g
2113 Fo(adr)g Fn(and)h(the)g(p)q(ort)f(n)o(um-)240 1613 y(b)q(er)j(to)e
2114 Fo(portno)p Fn(.)19 b Fo(portno)c Fn(defaults)g(to)g(0.)0 1688
2115 y Fo(sockinetaddr)f(sina\(adr,)f(serv,)i(proto\))240 1762 y
2116 Fn(Constructs)e(a)g Fo(sockinetaddr)f Fn(ob)s(ject)h Fo(sina)g
2117 Fn(setting)g(inet)i(address)e(to)g Fo(adr)g Fn(and)h(the)g(p)q(ort)f(n)o(um-)
2118 240 1825 y(b)q(er)k(corresp)q(onding)h(to)e(the)h(service)g
2119 Fo(serv)g Fn(and)g(the)f(proto)q(col)h Fo(proto)p Fn(.)24 b(The)17
2120 b(proto)q(col)f(defaults)240 1887 y(to)f Fo(")p Fn(tcp)p Fo(")p
2121 Fn(.)0 1961 y Fo(sockinetaddr)f(sina\(thostname,)f(portno\))240
2122 2036 y Fn(Constructs)29 b(a)g Fo(sockinetaddr)f Fn(ob)s(ject)g
2123 Fo(sina)h Fn(setting)h(inet)g(address)g(to)e(the)i(address)f(of)240
2124 2098 y Fo(thostname)14 b Fn(and)h(the)h(p)q(ort)e(n)o(um)o(b)q(er)i(to)f
2125 Fo(portno)p Fn(.)k Fo(portno)14 b Fn(defaults)i(to)e(0.)0 2173
2126 y Fo(sockinetaddr)g(sina\(thostname,)f(serv,)h(proto\))240
2127 2247 y Fn(Constructs)29 b(a)g Fo(sockinetaddr)f Fn(ob)s(ject)g
2128 Fo(sina)h Fn(setting)h(inet)g(address)g(to)e(the)i(address)f(of)240
2129 2310 y Fo(thostname)20 b Fn(and)i(the)f(p)q(ort)h(n)o(um)o(b)q(er)f(corresp)q
2130 (onding)i(to)e(the)g(service)i Fo(serv)d Fn(and)i(the)g(proto-)240
2131 2372 y(col)16 b Fo(proto)p Fn(.)j(The)c(proto)q(col)g(defaults)h(to)f
2132 Fo(")p Fn(tcp)p Fo(")p Fn(.)0 2446 y Fo(void*)f(a)h(=)g(sina)240
2133 2521 y Fn(returns)g(the)g(address)h(of)e(the)i Fo(sockaddr_in)d
2134 Fn(part)i(of)g Fo(sockinetaddr)e Fn(ob)s(ject)i Fo(sina)f Fn(as)h(v)o(oid*.)0
2135 2595 y Fo(int)g(sz)g(=)g(sina.size\(\))240 2670 y Fn(returns)g(the)g(sizeof)h
2136 Fo(sockaddr_in)e Fn(part)g(of)h Fo(sockinetaddr)f Fn(ob)s(ject)g
2137 Fo(sina)p Fn(.)p eop
2138 %%Page: 20 22
2139 bop 0 -58 a Fn(Chapter)15 b(5:)k(so)q(c)o(kinetaddr)d(Class)1302
2140 b(20)0 183 y Fo(int)15 b(af)g(=)g(sina.family\(\))240 258 y
2141 Fn(returns)g Fo(sockinetbuf::af_inet)d Fn(if)k(all)g(is)g(w)o(ell.)0
2142 333 y Fo(int)f(pn)g(=)g(sina.getport\(\))240 407 y Fn(returns)g(the)g(p)q
2143 (ort)g(n)o(um)o(b)q(er)h(of)f(the)g Fo(sockinetaddr)e Fn(ob)s(ject)i
2144 Fo(sina)g Fn(in)h(host)e(b)o(yte)h(order.)0 482 y Fo(const)f(char*)h(hn)g(=)g
2145 (getthostname\(\))240 557 y Fn(returns)g(the)g(host)g(name)g(of)g(the)g
2146 Fo(sockinetaddr)f Fn(ob)s(ject)g Fo(sina)p Fn(.)p eop
2147 %%Page: 21 23
2148 bop 0 -58 a Fn(Chapter)15 b(6:)k(so)q(c)o(kunixbuf)e(Class)1317
2149 b(21)0 183 y Fk(6)41 b(so)r(c)n(kunixbuf)12 b(Class)62 353
2150 y Fo(sockunixbuf)d Fn(class)i(is)g(deriv)o(ed)g(from)f Fo(sockbuf)g
2151 Fn(class)g(declared)i(in)f Fo(<sockstream.h>)e Fn(and)i(hence,)h(inherits)0
2152 416 y(most)j(of)g(the)h(public)i(mem)o(b)q(er)d(functions)i(of)e
2153 Fo(sockbuf)p Fn(.)20 b(See)d(Chapter)e(2)g([so)q(c)o(kbuf)h(Class],)f(page)g
2154 (4,)g(for)g(more)0 478 y(information)g(on)g Fo(sockbuf)p Fn(.)0
2155 686 y Fm(6.1)33 b(Metho)r(ds)62 823 y Fn(In)16 b(what)f(follo)o(ws,)25
2156 960 y Fl(\000)30 b Fo(ty)15 b Fn(denotes)g(the)h(so)q(c)o(k)o(et)e(t)o(yp)q
2157 (e)h(and)h(is)g(of)e(t)o(yp)q(e)i Fo(sockbuf::type)25 1030
2158 y Fl(\000)30 b Fo(proto)14 b Fn(denotes)i(the)f(proto)q(col)g(n)o(um)o(b)q
2159 (er)h(and)f(is)h(of)f(t)o(yp)q(e)g(in)o(t)25 1101 y Fl(\000)30
2160 b Fo(su)15 b Fn(is)h(a)e Fo(sockbuf)h Fn(and)g(m)o(ust)g(b)q(e)h(in)g
2161 Fi(unix)j Fn(domain)25 1171 y Fl(\000)30 b Fo(path)15 b Fn(is)g(the)h
2162 Fi(unix)j Fn(path)c(name)g(lik)o(e)i Fo(")p Fn(/tmp/unix)p
2163 981 1171 14 2 v 16 w(so)q(c)o(k)o(et)p Fo(")0 1308 y(sockunixbuf)d(uns\(ty,)g
2164 (proto\))240 1379 y Fn(Constructs)k(a)g Fo(sockunixbuf)f Fn(ob)s(ject)h
2165 Fo(uns)g Fn(with)h Fo(ty)f Fn(as)g(its)h(t)o(yp)q(e)g(and)f
2166 Fo(proto)g Fn(as)g(its)h(proto)q(col)240 1441 y(n)o(um)o(b)q(er.)h
2167 Fo(proto)15 b Fn(defaults)g(to)g(0.)0 1512 y Fo(sockunixbuf)f(uns)g(=)h(su)
2168 240 1582 y Fn(Constructs)f(a)h Fo(sockunixbuf)f Fn(ob)s(ject)h
2169 Fo(uns)f Fn(whic)o(h)i(uses)g(the)f(same)g(so)q(c)o(k)o(et)g(as)f(is)i(used)g
2170 (b)o(y)f Fo(su)p Fn(.)0 1653 y Fo(uns)g(=)g(su)66 b(sockunixbuf)14
2171 b Fn(ob)s(ject)h Fo(uns)g Fn(closes)g(its)h(curren)o(t)f(so)q(c)o(k)o(et)g
2172 (if)h(no)f(other)g Fo(sockbuf)f Fn(is)i(referring)g(to)f(it)240
2173 1715 y(and)g(uses)h(the)f(so)q(c)o(k)o(et)g(that)f Fo(sockbuf)g
2174 Fn(ob)s(ject)h Fo(su)g Fn(is)h(using.)0 1786 y Fo(uns.open\(ty,)e(proto\))240
2175 1856 y Fn(create)h(a)h Fo(sockunixbuf)e Fn(ob)s(ject)h(with)h
2176 Fo(ty)f Fn(as)h(its)g(t)o(yp)q(e)f(and)h Fo(proto)f Fn(as)g(its)h(proto)q
2177 (col)g(and)g(assign)240 1919 y(the)f Fo(sockunixbuf)f Fn(ob)s(ject)h(so)f
2178 (created)i(to)e Fo(*this)p Fn(.)19 b(It)d(returns)f Fo(this)p
2179 Fn(.)k Fo(proto)14 b Fn(defaults)i(to)f(0.)0 1989 y Fo(uns.bind\(path\))240
2180 2060 y Fn(binds)h Fo(uns)f Fn(to)g(the)g Fi(unix)k Fn(pathname)d
2181 Fo(path)p Fn(.)0 2130 y Fo(uns.connect\(path\))240 2201 y Fn(connects)g
2182 Fo(uns)e Fn(to)h(the)g Fi(unix)20 b Fn(pathname)15 b Fo(path)p
2183 Fn(.)0 2408 y Fm(6.2)33 b Fh(unix)17 b Fm(Datagram)d(So)r(c)n(k)n(ets)62
2184 2545 y Fn(The)i(follo)o(wing)h(t)o(w)o(o)d(programs)h(illustrates)i(ho)o(w)e
2185 (to)g(use)h Fo(sockunixbuf)e Fn(class)i(for)g(datagram)e(connection)0
2186 2608 y(in)19 b Fi(unix)j Fn(domain.)29 b Fo(tdunread.cc)16
2187 b Fn(also)i(sho)o(ws)g(ho)o(w)f(to)h(use)g Fo(isockunix)f Fn(class)h(and)g
2188 Fo(tdunwrite.cc)f Fn(sho)o(ws)0 2670 y(ho)o(w)e(to)f(use)i
2189 Fo(osockunix)e Fn(class.)p eop
2190 %%Page: 22 24
2191 bop 0 -58 a Fn(Chapter)15 b(6:)k(so)q(c)o(kunixbuf)e(Class)1317
2192 b(22)0 183 y Fg(tdunread.cc)120 321 y Fo(//)24 b(reads)f(data)g(sent)g(by)h
2193 (tdunwrite.cc)120 371 y(#include)f(<sockunix.h>)120 421 y(#include)g
2194 (<unistd.h>)120 471 y(#include)g(<errno.h>)120 570 y(int)g(main\(int)g(ac,)h
2195 (char**)f(av\))120 620 y({)311 670 y(if)g(\(ac)h(!=)g(2\))f({)502
2196 720 y(cerr)g(<<)h("USAGE:)f(")g(<<)h(av[0])f(<<)h(")f(socket_path_name\\n";)
2197 502 770 y(return)g(1;)311 820 y(})311 919 y(//)g(isockunix)g(builds)g(the)h
2198 (sockunixbuf)e(object)311 969 y(isockunix)46 b(su)24 b
2199 (\(sockbuf::sock_dgram\);)311 1069 y(su->bind\(av[1]\);)311
2200 1168 y(cout)f(<<)h("Socket)f(name)g(=)h(")f(<<)h(av[1])f(<<)h(endl;)311
2201 1268 y(if)f(\(chmod\(av[1],)g(0777\))g(==)g(-1\))h({)502 1318
2202 y(perror\("chmod"\);)502 1367 y(return)f(1;)311 1417 y(})311
2203 1517 y(char)g(buf[1024];)311 1567 y(int)g(i;)311 1617 y(su)g(>>)h(i;)311
2204 1666 y(cout)f(<<)h(av[0])f(<<)h(":)f(")h(<<)f(i)h(<<)g(")g(strings:)e(";)311
2205 1716 y(while)h(\(i--\))g({)502 1766 y(su)g(>>)h(buf;)502 1816
2206 y(cout)47 b(<<)24 b(buf)f(<<)h(')f(';)311 1866 y(})311 1915
2207 y(cout)g(<<)h(endl;)311 2015 y(unlink\(av[1]\);)311 2065 y(return)f(0;)120
2208 2115 y(})0 2333 y Fg(tdun)n(write.cc)120 2471 y Fo(//)h(sends)f(data)g(to)h
2209 (tdunread.cc)120 2521 y(#include)f(<sockunix.h>)120 2620 y(int)g(main\(int)g
2210 (ac,)h(char**)f(av\))120 2670 y({)p eop
2211 %%Page: 23 25
2212 bop 0 -58 a Fn(Chapter)15 b(6:)k(so)q(c)o(kunixbuf)e(Class)1317
2213 b(23)311 183 y Fo(if)23 b(\(ac)h(<)g(2\))f({)502 233 y(cerr)g(<<)h("USAGE:)f
2214 (")g(<<)h(av[0])621 283 y(<<)g(")f(socket_path_name)f(data...\\n";)502
2215 333 y(return)h(1;)311 382 y(})311 482 y(osockunix)g(su)g
2216 (\(sockbuf::sock_dgram\);)120 582 y(su->connect)f(\(av[1]\);)311
2217 681 y(su)h(<<)h(ac)g(<<)f(')h(';)311 731 y(while)f(\(*av\))g({)h(su)g(<<)f
2218 (av[i])g(<<)h(')g(';)f(av++;)g(})311 781 y(su)g(<<)h(endl;)311
2219 881 y(return)f(0;)120 930 y(})0 1166 y Fm(6.3)33 b Fh(unix)17
2220 b Fm(Stream)f(So)r(c)n(k)n(ets)62 1304 y Fn(The)g(follo)o(wing)h(t)o(w)o(o)e
2221 (programs)f(illustrates)j(ho)o(w)f(to)f(use)h Fo(sockunixbuf)f
2222 Fn(class)h(for)f(stream)g(connection)i(in)0 1366 y Fi(unix)i
2223 Fn(domain.)i(It)15 b(also)g(sho)o(ws)g(ho)o(w)f(to)h(use)g
2224 Fo(iosockunix)f Fn(class.)0 1585 y Fg(tsunread.cc)120 1724
2225 y Fo(//)24 b(exchanges)e(char)i(strings)e(with)i(tsunwrite.cc)120
2226 1773 y(#include)f(<sockunix.h>)120 1823 y(#include)g(<unistd.h>)120
2227 1873 y(#include)g(<errno.h>)120 1973 y(int)g(main\(int)g(ac,)h(char**)f(av\))
2228 120 2022 y({)311 2072 y(if)g(\(ac)h(!=)g(2\))f({)502 2122 y(cerr)g(<<)h
2229 ("USAGE:)f(")g(<<)h(av[0])f(<<)h(")f(socket_path_name\\n";)502
2230 2172 y(return)g(1;)311 2222 y(})311 2321 y(sockunixbuf)46 b
2231 (su\(sockbuf::sock_stream\);)311 2371 y(su.bind\(av)22 b([1]\);)311
2232 2471 y(cout)h(<<)h("Socket)f(name)g(=)h(")f(<<)h(av[1])f(<<)h(endl;)311
2233 2570 y(if)f(\(chmod\(av[1],)g(0777\))g(==)g(-1\))h({)502 2620
2234 y(perror\("chmod"\);)502 2670 y(return)f(1;)p eop
2235 %%Page: 24 26
2236 bop 0 -58 a Fn(Chapter)15 b(6:)k(so)q(c)o(kunixbuf)e(Class)1317
2237 b(24)311 183 y Fo(})311 283 y(su.listen\(3\);)311 382 y(iosockunix)22
2238 b(ioput)i(=)f(su.accept)g(\(\);)311 432 y(char)166 b(buf[1024];)311
2239 532 y(ioput)23 b(<<)h(av[0])f(<<)g(')h(')g(<<)f(av[1])h(<<)f(endl;)311
2240 582 y(while)g(\()h(ioput)f(>>)h(buf)f(\))h(cout)f(<<)h(av[0])f(<<)g(":)h(")g
2241 (<<)f(buf)h(<<)f(endl;)311 632 y(unlink\(av[1]\);)311 681 y(return)g(0;)120
2242 731 y(})0 939 y Fg(tsun)n(write.cc)120 1076 y Fo(//)h(exchanges)e(char)i
2243 (strings)e(with)i(tsunread.cc)120 1126 y(#include)f(<sockunix.h>)120
2244 1225 y(int)g(main\(int)g(ac,)h(char**)f(av\))120 1275 y({)311
2245 1325 y(if)g(\(ac)h(<)g(2\))f({)502 1375 y(cerr)g(<<)h("USAGE:)f(")g(<<)h
2246 (av[0])621 1424 y(<<)g(")f(socket_path_name)f(data...\\n";)502
2247 1474 y(return)h(1;)311 1524 y(})311 1624 y(iosockunix)f(oput)i
2248 (\(sockbuf::sock_stream\);)311 1673 y(oput->connect)e(\(av)h([1]\);)311
2249 1773 y(char)g(buf[128];)311 1873 y(oput)g(>>)h(buf;)311 1923
2250 y(cout)f(<<)h(buf)f(<<)h(')g(';)311 1972 y(oput)f(>>)h(buf;)311
2251 2022 y(cout)f(<<)h(buf)f(<<)h(endl;)311 2122 y(while)f(\(*av\))g(oput)h(<<)f
2252 (*av++)g(<<)h(')g(';)311 2172 y(oput)f(<<)h(endl;)311 2271
2253 y(return)f(0;)120 2321 y(})p eop
2254 %%Page: 25 27
2255 bop 0 -58 a Fn(Chapter)15 b(7:)k(so)q(c)o(kunixaddr)e(Class)1290
2256 b(25)0 183 y Fk(7)41 b(so)r(c)n(kunixaddr)13 b(Class)62 370
2257 y Fn(Class)e Fo(sockunixaddr)e Fn(is)j(deriv)o(ed)g(from)e(class)h
2258 Fo(sockAddr)f Fn(declared)i(in)f Fo(<sockstream.h>)e Fn(and)i(from)f(struct)0
2259 432 y Fo(sockaddr_un)15 b Fn(declared)i(in)h Fo(<sys/un.h>)p
2260 Fn(.)k(Alw)o(a)o(ys)16 b(use)g Fo(sockunixaddr)f Fn(ob)s(jects)h(for)g
2261 (addresses)g(with)h Fi(unix)0 495 y Fn(domain)f(of)e(so)q(c)o(k)o(ets.)20
2262 b(See)15 b(Section)i(2.4)d([Connection)h(Establishmen)o(t],)g(page)g(9.)62
2263 632 y(In)h(what)f(follo)o(ws,)25 769 y Fl(\000)30 b Fo(path)15
2264 b Fn(is)g(the)h Fi(unix)j Fn(path)c(name)g(lik)o(e)i Fo(")p
2265 Fn(/tmp/unix)p 981 769 14 2 v 16 w(so)q(c)o(k)o(et)p Fo(")0
2266 906 y(sockunixaddr)d(suna\(path\))240 980 y Fn(Constructs)g(a)h
2267 Fo(sockunixaddr)f Fn(ob)s(ject)g Fo(suna)h Fn(with)h Fo(path)e
2268 Fn(as)h(the)g Fi(unix)20 b Fn(path)15 b(name.)0 1055 y Fo(void*)f(a)h(=)g
2269 (suna)240 1130 y Fn(returns)g(the)g(address)h(of)e(the)i Fo(sockaddr_un)d
2270 Fn(part)i(of)g Fo(sockunixaddr)e Fn(ob)s(ject)i Fo(suna)f Fn(as)h(v)o(oid*.)0
2271 1204 y Fo(int)g(sz)g(=)g(suna.size\(\))240 1279 y Fn(returns)g(the)g(sizeof)h
2272 Fo(sockaddr_un)e Fn(part)g(of)h Fo(sockunixaddr)f Fn(ob)s(ject)g
2273 Fo(suna)p Fn(.)0 1354 y Fo(int)h(af)g(=)g(suna.family\(\))240
2274 1429 y Fn(returns)g Fo(sockunixbuf::af_unix)d Fn(if)k(all)g(is)g(w)o(ell.)p
2275 eop
2276 %%Page: 26 28
2277 bop 0 -58 a Fn(Chapter)15 b(8:)k(so)q(c)o(kstream)c(Classes)1296
2278 b(26)0 183 y Fk(8)41 b(so)r(c)n(kstream)15 b(Classes)62 360
2279 y Fn(so)q(c)o(kstream)k(classes)i(are)f(designed)h(in)g(suc)o(h)g(a)f(w)o(a)o
2280 (y)f(that)g(they)i(pro)o(vide)f(the)g(same)g(in)o(terface)h(as)e(their)0
2281 422 y(stream)e(coun)o(terparts)g(do.)28 b(W)l(e)18 b(ha)o(v)o(e)g
2282 Fo(isockstream)e Fn(deriv)o(ed)j(from)e Fo(istream)g Fn(and)i
2283 Fo(osockstream)d Fn(deriv)o(ed)0 485 y(from)e Fo(ostream)p
2284 Fn(.)19 b(W)l(e)d(also)f(ha)o(v)o(e)g Fo(iosockstream)e Fn(whic)o(h)j(is)g
2285 (deriv)o(ed)g(from)f Fo(iostream)p Fn(.)62 622 y(Eac)o(h)f(domain)h(also)f
2286 (has)g(its)h(o)o(wn)e(set)h(of)g Fo(stream)g Fn(classes.)20
2287 b(F)l(or)13 b(example,)i Fo(unix)f Fn(domain)g(has)h Fo(isockunix)p
2288 Fn(,)0 684 y Fo(osockunix)p Fn(,)e(and)h Fo(iosockunix)e Fn(deriv)o(ed)j
2289 (from)f Fo(isockstream)p Fn(,)e Fo(osockstream)p Fn(,)g(and)j
2290 Fo(iosockstream)d Fn(resp)q(ec-)0 746 y(tiv)o(ely)l(.)21 b(Similarly)l(,)c
2291 Fo(inet)e Fn(domain)g(has)g Fo(isockinet)p Fn(,)f Fo(osockinet)p
2292 Fn(,)f(and)j Fo(iosockinet)p Fn(.)0 960 y Fm(8.1)33 b(ioso)r(c)n(kstreams)0
2293 1158 y Fg(8.1.1)d(iso)r(c)n(kstream)16 b(Class)62 1295 y Fn(Since)i
2294 Fo(isockstream)d Fn(is)j(publicly)h(deriv)o(ed)f(from)d Fo(istream)p
2295 Fn(,)h(most)g(of)g(the)h(public)h(functions)g(of)e Fo(istream)0
2296 1357 y Fn(are)f(also)g(a)o(v)m(ailable)i(in)f Fo(isockstream)p
2297 Fn(.)62 1494 y Fo(isockstream)h Fn(rede\014nes)i Fo(rdbuf\(\))f
2298 Fn(de\014ned)h(in)g(its)g(virtual)g(base)f(class)h Fo(ios)p
2299 Fn(.)29 b(Since,)20 b Fo(ios::rdbuf\(\))c Fn(is)0 1557 y(not)f(virtual,)h
2300 (care)g(m)o(ust)f(b)q(e)h(tak)o(en)g(to)f(call)h(the)g(correct)g
2301 Fo(rdbuf\(\))e Fn(through)i(a)f(reference)h(or)f(a)h(p)q(oin)o(ter)g(to)f(an)
2302 0 1619 y(ob)s(ject)g(of)f(class)i Fo(isockstream)p Fn(.)62
2303 1756 y(In)g(what)f(follo)o(ws,)25 1893 y Fl(\000)30 b Fo(sb)15
2304 b Fn(is)h(a)e Fo(sockbuf)h Fn(ob)s(ject)25 1965 y Fl(\000)30
2305 b Fo(sbp)15 b Fn(is)g(a)g(p)q(oin)o(ter)h(to)f(a)f Fo(sockbuf)h
2306 Fn(ob)s(ject)0 2102 y Fo(isockstream)f(is\(sb\))240 2174 y
2307 Fn(Constructs)g(an)i Fo(isockstream)d Fn(ob)s(ject)i Fo(is)g
2308 Fn(with)g Fo(sb)g Fn(as)g(its)g Fo(sockbuf)p Fn(.)0 2247 y
2309 Fo(isockstream)f(is\(sbp\))240 2319 y Fn(Constructs)g(an)i
2310 Fo(isockstream)d Fn(ob)s(ject)i Fo(is)g Fn(with)g Fo(*sbp)g
2311 Fn(as)g(its)g Fo(sockbuf)p Fn(.)0 2391 y Fo(sbp)g(=)g(is.rdbuf\(\))240
2312 2463 y Fn(returns)g(a)g(p)q(oin)o(ter)h(to)e(the)h Fo(sockbuf)g
2313 Fn(of)f(the)i Fo(isockstream)d Fn(ob)s(ject)i Fo(is)p Fn(.)0
2314 2535 y Fo(isockstream::operator)d(->)j(\(\))240 2608 y Fn(returns)f(a)f(p)q
2315 (oin)o(ter)h(to)f(the)h Fo(isockstream)p Fn('s)e Fo(sockbuf)h
2316 Fn(so)g(that)g(the)h(user)g(can)f(use)i Fo(isockstream)240
2317 2670 y Fn(ob)s(ject)g(as)f(a)h Fo(sockbuf)g Fn(ob)s(ject.)p
2318 eop
2319 %%Page: 27 29
2320 bop 0 -58 a Fn(Chapter)15 b(8:)k(so)q(c)o(kstream)c(Classes)1296
2321 b(27)455 183 y Fo(is->connect)23 b(\(sa\);)g(//)h(same)f(as)g
2322 (is.rdbuf\(\)->connect)f(\(sa\);)0 392 y Fg(8.1.2)30 b(oso)r(c)n(kstream)15
2323 b(Class)62 529 y Fn(Since)j Fo(osockstream)d Fn(is)j(publicly)h(deriv)o(ed)f
2324 (from)d Fo(ostream)p Fn(,)h(most)g(of)g(the)h(public)h(functions)g(of)e
2325 Fo(ostream)0 591 y Fn(are)f(also)g(a)o(v)m(ailable)i(in)f Fo(osockstream)p
2326 Fn(.)62 728 y Fo(osockstream)h Fn(rede\014nes)i Fo(rdbuf\(\))f
2327 Fn(de\014ned)h(in)g(its)g(virtual)g(base)f(class)h Fo(ios)p
2328 Fn(.)29 b(Since,)20 b Fo(ios::rdbuf\(\))c Fn(is)0 791 y(not)f(virtual,)h
2329 (care)g(m)o(ust)f(b)q(e)h(tak)o(en)g(to)f(call)h(the)g(correct)g
2330 Fo(rdbuf\(\))e Fn(through)i(a)f(reference)h(or)f(a)h(p)q(oin)o(ter)g(to)f(an)
2331 0 853 y(ob)s(ject)g(of)f(class)i Fo(osockstream)p Fn(.)62 990
2332 y(In)g(what)f(follo)o(ws,)25 1127 y Fl(\000)30 b Fo(sb)15 b
2333 Fn(is)h(a)e Fo(sockbuf)h Fn(ob)s(ject)25 1202 y Fl(\000)30
2334 b Fo(sbp)15 b Fn(is)g(a)g(p)q(oin)o(ter)h(to)f(a)f Fo(sockbuf)h
2335 Fn(ob)s(ject)0 1339 y Fo(osockstream)f(os\(sb\))240 1414 y
2336 Fn(Constructs)g(an)i Fo(osockstream)d Fn(ob)s(ject)i Fo(os)g
2337 Fn(with)g Fo(sb)g Fn(as)g(its)g Fo(sockbuf)p Fn(.)0 1489 y
2338 Fo(osockstream)f(os\(sbp\))240 1564 y Fn(Constructs)g(an)i
2339 Fo(osockstream)d Fn(ob)s(ject)i Fo(os)g Fn(with)g Fo(*sbp)g
2340 Fn(as)g(its)g Fo(sockbuf)p Fn(.)0 1639 y Fo(sbp)g(=)g(os.rdbuf\(\))240
2341 1713 y Fn(returns)g(a)g(p)q(oin)o(ter)h(to)e(the)h Fo(sockbuf)g
2342 Fn(of)f(the)i Fo(osockstream)d Fn(ob)s(ject)i Fo(os)p Fn(.)0
2343 1788 y Fo(osockstream::operator)d(->)j(\(\))240 1863 y Fn(returns)f(a)f(p)q
2344 (oin)o(ter)h(to)f(the)h Fo(osockstream)p Fn('s)e Fo(sockbuf)h
2345 Fn(so)g(that)g(the)h(user)g(can)f(use)i Fo(osockstream)240
2346 1925 y Fn(ob)s(ject)g(as)f(a)h Fo(sockbuf)g Fn(ob)s(ject.)455
2347 2000 y Fo(os->connect)23 b(\(sa\);)g(//)h(same)f(as)g(os.rdbuf\(\)->connect)f
2348 (\(sa\);)0 2209 y Fg(8.1.3)30 b(ioso)r(c)n(kstream)15 b(Class)62
2349 2346 y Fn(Since)e Fo(iosockstream)c Fn(is)j(publicly)i(deriv)o(ed)e(from)e
2350 Fo(iostream)p Fn(,)g(most)h(of)f(the)h(public)j(functions)d(of)g
2351 Fo(iostream)0 2408 y Fn(are)k(also)g(a)o(v)m(ailable)i(in)f
2352 Fo(iosockstream)p Fn(.)62 2545 y Fo(iosockstream)f Fn(rede\014nes)j
2353 Fo(rdbuf\(\))d Fn(de\014ned)j(in)g(its)f(virtual)g(base)g(class)g
2354 Fo(ios)p Fn(.)23 b(Since,)c Fo(ios::rdbuf\(\))14 b Fn(is)0
2355 2608 y(not)h(virtual,)h(care)g(m)o(ust)f(b)q(e)h(tak)o(en)g(to)f(call)h(the)g
2356 (correct)g Fo(rdbuf\(\))e Fn(through)i(a)f(reference)h(or)f(a)h(p)q(oin)o
2357 (ter)g(to)f(an)0 2670 y(ob)s(ject)g(of)f(class)i Fo(iosockstream)p
2358 Fn(.)p eop
2359 %%Page: 28 30
2360 bop 0 -58 a Fn(Chapter)15 b(8:)k(so)q(c)o(kstream)c(Classes)1296
2361 b(28)62 183 y(In)16 b(what)f(follo)o(ws,)25 321 y Fl(\000)30
2362 b Fo(sb)15 b Fn(is)h(a)e Fo(sockbuf)h Fn(ob)s(ject)25 397 y
2363 Fl(\000)30 b Fo(sbp)15 b Fn(is)g(a)g(p)q(oin)o(ter)h(to)f(a)f
2364 Fo(sockbuf)h Fn(ob)s(ject)0 535 y Fo(iosockstream)f(io\(sb\))240
2365 611 y Fn(Constructs)g(an)i Fo(iosockstream)d Fn(ob)s(ject)i
2366 Fo(io)g Fn(with)g Fo(sb)g Fn(as)g(its)g Fo(sockbuf)p Fn(.)0
2367 687 y Fo(iosockstream)f(io\(sbp\))240 763 y Fn(Constructs)g(an)i
2368 Fo(iosockstream)d Fn(ob)s(ject)i Fo(io)g Fn(with)g Fo(*sbp)g
2369 Fn(as)g(its)g Fo(sockbuf)p Fn(.)0 838 y Fo(sbp)g(=)g(io.rdbuf\(\))240
2370 914 y Fn(returns)g(a)g(p)q(oin)o(ter)h(to)e(the)h Fo(sockbuf)g
2371 Fn(of)f(the)i Fo(iosockstream)d Fn(ob)s(ject)i Fo(io)p Fn(.)0
2372 990 y Fo(iosockstream::operator)d(->)j(\(\))240 1066 y Fn(returns)10
2373 b(a)g(p)q(oin)o(ter)g(to)g(the)g Fo(iosockstream)p Fn('s)e
2374 Fo(sockbuf)h Fn(so)h(that)g(the)g(user)g(can)g(use)h Fo(iosockstream)240
2375 1128 y Fn(ob)s(ject)k(as)f(a)h Fo(sockbuf)g Fn(ob)s(ject.)455
2376 1204 y Fo(io->connect)23 b(\(sa\);)g(//)h(same)f(as)g(io.rdbuf\(\)->connect)f
2377 (\(sa\);)0 1438 y Fm(8.2)33 b(ioso)r(c)n(kinet)15 b(Stream)h(Classes)62
2378 1576 y Fn(W)l(e)g(discus)g(only)g Fo(isockinet)e Fn(class)i(here.)21
2379 b Fo(osockinet)14 b Fn(and)i Fo(iosockinet)e Fn(are)h(similar)h(and)g(are)f
2380 (left)h(out.)0 1638 y(Ho)o(w)o(ev)o(er,)e(they)h(are)g(co)o(v)o(ered)g(in)h
2381 (the)f(examples)h(that)f(follo)o(w.)0 1855 y Fg(8.2.1)30 b(iso)r(c)n(kinet)62
2382 1993 y Fo(isockinet)19 b Fn(is)h(used)g(to)f(handle)i(in)o(terpro)q(cess)g
2383 (comm)o(unication)f(in)h Fi(inet)g Fn(domain.)34 b(It)20 b(is)g(deriv)o(ed)h
2384 (from)0 2055 y Fo(isockstream)f Fn(class)j(and)f(it)g(uses)g(a)g
2385 Fo(sockinetbuf)e Fn(as)h(its)h(stream)g(bu\013er.)39 b(See)23
2386 b(Section)g(8.1.3)d([ioso)q(c)o(k-)0 2118 y(stream],)13 b(page)g(27,)h(for)f
2387 (more)h(details)h(on)f Fo(isockstream)p Fn(.)j(See)e(Chapter)f(4)f([so)q(c)o
2388 (kinetbuf)i(Class],)e(page)h(14,)g(for)0 2180 y(information)h(on)g
2389 Fo(sockinetbuf)p Fn(.)62 2318 y(In)h(what)f(follo)o(ws,)25
2390 2456 y Fl(\000)30 b Fo(ty)17 b Fn(is)g(a)g Fo(sockbuf::type)e
2391 Fn(and)j(m)o(ust)e(b)q(e)i(one)f(of)g Fo(sockbuf::sock_stream)p
2392 Fn(,)d Fo(sockbuf::sock_dgram)p Fn(,)90 2518 y Fo(sockbuf::sock_raw)p
2393 Fn(,)e Fo(sockbuf::sock_rdm)p Fn(,)h(and)i Fo(sockbuf::sock_seqpacket)25
2394 2594 y Fl(\000)30 b Fo(proto)14 b Fn(denotes)i(the)f(proto)q(col)g(n)o(um)o
2395 (b)q(er)h(and)f(is)h(of)f(t)o(yp)q(e)g(in)o(t)25 2670 y Fl(\000)30
2396 b Fo(sb)15 b Fn(is)h(a)e Fo(sockbuf)h Fn(ob)s(ject)f(and)i(m)o(ust)e(b)q(e)i
2397 (in)g Fi(inet)h Fn(domain)p eop
2398 %%Page: 29 31
2399 bop 0 -58 a Fn(Chapter)15 b(8:)k(so)q(c)o(kstream)c(Classes)1296
2400 b(29)25 183 y Fl(\000)30 b Fo(sinp)15 b Fn(is)g(a)g(p)q(oin)o(ter)h(to)e(an)i
2401 (ob)s(ject)e(of)h Fo(sockinetbuf)0 323 y(isockinet)f(is)h(\(ty,)f(proto\))240
2402 401 y Fn(constructs)k(an)g Fo(isockinet)g Fn(ob)s(ject)g Fo(is)g
2403 Fn(whose)g Fo(sockinetbuf)f Fn(bu\013er)h(is)h(of)g(the)f(t)o(yp)q(e)h
2404 Fo(ty)f Fn(and)240 463 y(has)d(the)g(proto)q(col)h(n)o(um)o(b)q(er)f
2405 Fo(proto)p Fn(.)k(The)d(default)f(proto)q(col)h(n)o(um)o(b)q(er)f(is)h(0.)0
2406 540 y Fo(isockinet)e(is)h(\(sb\))240 618 y Fn(constructs)c(a)f
2407 Fo(isockinet)g Fn(ob)s(ject)h Fo(is)f Fn(whose)h Fo(sockinetbuf)f
2408 Fn(is)h Fo(sb)p Fn(.)18 b Fo(sb)11 b Fn(m)o(ust)g(b)q(e)g(in)h
2409 Fi(inet)h Fn(domain.)0 696 y Fo(isockinet)h(is)h(\(sinp\))240
2410 773 y Fn(constructs)g(a)g Fo(isockinet)f Fn(ob)s(ject)g Fo(is)h
2411 Fn(whose)g Fo(sockinetbuf)f Fn(is)i Fo(sinp)p Fn(.)0 851 y
2412 Fo(sinp)f(=)g(is.rdbuf)f(\(\))240 928 y Fn(returns)h(a)g(p)q(oin)o(ter)h(to)e
2413 (the)h Fo(sockinetbuf)f Fn(of)h Fo(isockinet)f Fn(ob)s(ject)g
2414 Fo(is)p Fn(.)0 1006 y Fo(isockinet::operator)f(->)240 1083
2415 y Fn(returns)h Fo(sockinetbuf)e Fn(of)i Fo(sockinet)e Fn(so)i(that)f(the)h
2416 Fo(sockinet)f Fn(ob)s(ject)g(acts)h(as)f(a)h(smart)e(p)q(oin)o(ter)240
2417 1146 y(to)j Fo(sockinetbuf)p Fn(.)551 1223 y Fo(is->localhost)22
2418 b(\(\);)h(//)h(same)f(as)h(is.rdbuf)f(\(\)->localhost)f(\(\);)0
2419 1456 y Fg(8.2.2)30 b(ioso)r(c)n(kinet)15 b(examples)62 1596
2420 y Fn(The)f(\014rst)g(pair)g(of)f(examples)i(demonstrates)e(datagram)f(so)q(c)
2421 o(k)o(et)i(connections)h(in)f(the)g Fi(inet)i Fn(domain.)k(First,)0
2422 1658 y Fo(tdinread)g Fn(prin)o(ts)h(its)g(lo)q(cal)h(host)e(and)h(lo)q(cal)h
2423 (p)q(ort)f(on)g(stdout)f(and)h(w)o(aits)f(for)h(input)h(in)f(the)g
2424 (connection.)0 1721 y Fo(tdinwrite)c Fn(is)h(started)f(with)i(the)f(lo)q(cal)
2425 h(host)e(and)h(lo)q(cal)i(p)q(ort)d(of)h Fo(tdinread)f Fn(as)g(argumen)o(ts.)
2426 27 b(It)18 b(sends)h(the)0 1783 y(string)c Fo(")p Fn(Ho)o(w)g(do)g(y)o(e)g
2427 (do!)p Fo(")f Fn(to)h Fo(tdinread)f Fn(whic)o(h)i(in)g(turn)f(reads)g(the)h
2428 (string)f(and)g(prin)o(ts)h(on)f(its)g(stdout.)120 1923 y Fo(//)24
2429 b(tdinread.cc)120 1973 y(#include)f(<sockinet.h>)120 2072 y(int)g(main)h
2430 (\(\))120 2122 y({)215 2172 y(char)g(buf[256];)215 2222 y(isockinet)f(is)h
2431 (\(sockbuf::sock_dgram\);)215 2271 y(is->bind)f(\(\);)215 2371
2432 y(cout)h(<<)f(is->localhost\(\))f(<<)i(')f(')h(<<)g(is->localport\(\))e(<<)h
2433 (endl;)215 2471 y(is.getline)g(\(buf\);)215 2521 y(cout)h(<<)f(buf)h(<<)f
2434 (endl;)215 2620 y(return)g(0;)120 2670 y(})p eop
2435 %%Page: 30 32
2436 bop 0 -58 a Fn(Chapter)15 b(8:)k(so)q(c)o(kstream)c(Classes)1296
2437 b(30)120 183 y Fo(//)24 b(tdinwrite.cc--tdinwrite)c(hostname)j(portno)120
2438 233 y(#include)g(<sockinet.h>)120 283 y(#include)g(<stdlib.h>)120
2439 382 y(int)g(main)h(\(int)f(ac,)h(char**)f(av\))120 432 y({)215
2440 482 y(osockinet)g(os)h(\(sockbuf::sock_dgram\);)215 532 y(os->connect)f
2441 (\(av[1],)g(atoi\(av[2]\)\);)215 582 y(os)h(<<)g("How)f(do)h(ye)f(do!")g(<<)h
2442 (endl;)215 632 y(return)f(0;)120 681 y(})62 933 y Fn(The)15
2443 b(next)f(example)h(comm)o(unicates)g(with)g(an)f(nn)o(tp)g(serv)o(er)g
2444 (through)g(a)g Fo(sockbuf::sock_stream)e Fn(so)q(c)o(k)o(et)0
2445 995 y(connection)k(in)h Fi(inet)g Fn(domain.)k(After)15 b(establishing)i(a)e
2446 (connection)i(to)d(the)i(nn)o(tp)f(serv)o(er,)g(it)h(sends)g(a)f
2447 Fo(")p Fn(HELP)p Fo(")0 1057 y Fn(command)g(and)g(gets)g(bac)o(k)g(the)g
2448 (HELP)h(message)f(b)q(efore)g(sending)i(the)e Fo(")p Fn(QUIT)p
2449 Fo(")g Fn(command.)120 1214 y Fo(//)24 b(tnntp.cc)120 1264
2450 y(#include)f(<sockinet.h>)120 1363 y(int)g(main)h(\(\))120
2451 1413 y({)215 1463 y(char)48 b(buf[1024];)215 1513 y(iosockinet)23
2452 b(io)h(\(sockbuf::sock_stream\);)215 1563 y(io->connect)f
2453 (\("murdoch.acc.virginia.ed)o(u",)e("nntp",)i("tcp"\);)215
2454 1613 y(io.getline)g(\(buf,)g(1024\);)g(cout)g(<<)h(buf)g(<<)f(endl;)215
2455 1662 y(io)h(<<)g("HELP\\r\\n")e(<<)i(flush;)215 1712 y(io.getline)f(\(buf,)g
2456 (1024\);)g(cout)g(<<)h(buf)g(<<)f(endl;)215 1762 y(while)h(\(io.getline)e
2457 (\(buf,)h(1024\)\))311 1812 y(if)g(\(buf[0])g(==)h('.')f(&&)h(buf[1])f(==)h
2458 ('\\r'\))f(break;)311 1862 y(else)g(if)h(\(buf[0])f(==)g('.')h(&&)f(buf[1])g
2459 (==)h('.'\))f(cout)h(<<)f(buf+1)g(<<)h(endl;)311 1911 y(else)f(cout)h(<<)f
2460 (buf)h(<<)f(endl;)215 1961 y(io)h(<<)g("QUIT\\r\\n")e(<<)i(flush;)215
2461 2011 y(io.getline)f(\(buf,)g(1024\);)g(cout)g(<<)h(buf)g(<<)f(endl;)215
2462 2061 y(return)g(0;)120 2111 y(})0 2513 y Fm(8.3)33 b(ioso)r(c)n(kunix)16
2463 b(Classes)62 2670 y Fn(W)l(e)g(discuss)g(only)g Fo(isockunix)d
2464 Fn(here.)21 b Fo(osockunix)14 b Fn(and)h Fo(iosockunix)f Fn(are)h(similar.)p
2465 eop
2466 %%Page: 31 33
2467 bop 0 -58 a Fn(Chapter)15 b(8:)k(so)q(c)o(kstream)c(Classes)1296
2468 b(31)0 183 y Fg(8.3.1)30 b(iso)r(c)n(kunix)16 b(class)62 323
2469 y Fo(isockunix)i Fn(is)h(used)h(to)e(handle)i(in)o(terpro)q(cess)f(comm)o
2470 (unication)h(in)f Fi(unix)k Fn(domain.)32 b(It)19 b(is)g(deriv)o(ed)h(from)0
2471 385 y Fo(isockstream)11 b Fn(class)i(and)f(it)h(uses)g(a)f
2472 Fo(sockunixbuf)e Fn(as)j(its)f(stream)g(bu\013er.)19 b(See)13
2473 b(Section)g(8.1.3)e([ioso)q(c)o(kstream],)0 447 y(page)16 b(27,)g(for)g(more)
2474 g(details)i(on)e Fo(isockstream)p Fn(.)23 b(See)17 b(Chapter)f(6)h([so)q(c)o
2475 (kunixbuf)g(Class],)f(page)h(21,)f(for)g(infor-)0 509 y(mation)f(on)g
2476 Fo(sockunixbuf)p Fn(.)62 649 y(In)h(what)f(follo)o(ws,)25 788
2477 y Fl(\000)30 b Fo(ty)17 b Fn(is)g(a)g Fo(sockbuf::type)e Fn(and)j(m)o(ust)e
2478 (b)q(e)i(one)f(of)g Fo(sockbuf::sock_stream)p Fn(,)d Fo(sockbuf::sock_dgram)p
2479 Fn(,)90 850 y Fo(sockbuf::sock_raw)p Fn(,)e Fo(sockbuf::sock_rdm)p
2480 Fn(,)h(and)i Fo(sockbuf::sock_seqpacket)25 927 y Fl(\000)30
2481 b Fo(proto)14 b Fn(denotes)i(the)f(proto)q(col)g(n)o(um)o(b)q(er)h(and)f(is)h
2482 (of)f(t)o(yp)q(e)g(in)o(t)25 1004 y Fl(\000)30 b Fo(sb)15 b
2483 Fn(is)h(a)e Fo(sockbuf)h Fn(ob)s(ject)f(and)i(m)o(ust)e(b)q(e)i(in)g
2484 Fi(unix)k Fn(domain)25 1081 y Fl(\000)30 b Fo(sinp)15 b Fn(is)g(a)g(p)q(oin)o
2485 (ter)h(to)e(an)i(ob)s(ject)e(of)h Fo(sockunixbuf)0 1221 y(isockunix)f(is)h
2486 (\(ty,)f(proto\))240 1298 y Fn(constructs)k(an)g Fo(isockunix)g
2487 Fn(ob)s(ject)g Fo(is)g Fn(whose)g Fo(sockunixbuf)f Fn(bu\013er)h(is)h(of)g
2488 (the)f(t)o(yp)q(e)h Fo(ty)f Fn(and)240 1360 y(has)d(the)g(proto)q(col)h(n)o
2489 (um)o(b)q(er)f Fo(proto)p Fn(.)k(The)d(default)f(proto)q(col)h(n)o(um)o(b)q
2490 (er)f(is)h(0.)0 1437 y Fo(isockunix)e(is)h(\(sb\))240 1514
2491 y Fn(constructs)22 b(a)g Fo(isockunix)f Fn(ob)s(ject)h Fo(is)g
2492 Fn(whose)h Fo(sockunixbuf)d Fn(is)j Fo(sb)p Fn(.)42 b Fo(sb)22
2493 b Fn(m)o(ust)g(b)q(e)h(in)g Fi(unix)240 1576 y Fn(domain.)0
2494 1653 y Fo(isockunix)14 b(is)h(\(sinp\))240 1730 y Fn(constructs)g(a)g
2495 Fo(isockunix)f Fn(ob)s(ject)g Fo(is)h Fn(whose)g Fo(sockunixbuf)f
2496 Fn(is)i Fo(sinp)p Fn(.)0 1807 y Fo(sinp)f(=)g(is.rdbuf)f(\(\))240
2497 1884 y Fn(returns)h(a)g(p)q(oin)o(ter)h(to)e(the)h Fo(sockunixbuf)f
2498 Fn(of)h Fo(isockunix)f Fn(ob)s(ject)g Fo(is)p Fn(.)0 1961 y
2499 Fo(isockunix::operator)f(->)240 2038 y Fn(returns)h Fo(sockunixbuf)e
2500 Fn(of)i Fo(sockunix)e Fn(so)i(that)f(the)h Fo(sockunix)f Fn(ob)s(ject)g(acts)
2501 h(as)f(a)h(smart)e(p)q(oin)o(ter)240 2101 y(to)j Fo(sockunixbuf)p
2502 Fn(.)551 2178 y Fo(is->localhost)22 b(\(\);)h(//)h(same)f(as)h(is.rdbuf)f
2503 (\(\)->localhost)f(\(\);)0 2406 y Fg(8.3.2)30 b(ioso)r(c)n(kunix)16
2504 b(examples)62 2545 y Fo(tsunread)h Fn(listens)j(for)d(connections.)30
2505 b(When)18 b Fo(tsunwrite)f Fn(requests)h(connection,)h Fo(tsunread)e
2506 Fn(accepts)i(it)0 2608 y(and)14 b(w)o(aits)e(for)h(input.)20
2507 b Fo(tsunwrite)12 b Fn(sends)i(the)g(string)f Fo(")p Fn(Hello!!!)p
2508 Fo(")g Fn(to)g Fo(tsunread)p Fn(.)18 b Fo(tsunread)12 b Fn(reads)i(the)f
2509 (string)0 2670 y(sen)o(t)i(b)o(y)g Fo(tsunwrite)f Fn(and)h(prin)o(ts)h(on)f
2510 (its)g(stdout.)p eop
2511 %%Page: 32 34
2512 bop 0 -58 a Fn(Chapter)15 b(8:)k(so)q(c)o(kstream)c(Classes)1296
2513 b(32)120 183 y Fo(//)24 b(tsunread.cc)120 233 y(#include)f(<sockunix.h>)120
2514 283 y(#include)g(<unistd.h>)120 382 y(int)g(main)h(\(\))120
2515 432 y({)215 482 y(sockunixbuf)f(sunb)g(\(sockbuf::sock_stream\);)215
2516 532 y(sunb.bind)g(\("/tmp/socket+-"\);)215 582 y(sunb.listen)g(\(2\);)215
2517 632 y(isockunix)g(is)h(=)f(sunb.accept)g(\(\);)215 681 y(char)h(buf[32];)215
2518 731 y(is)g(>>)g(buf;)f(cout)g(<<)h(buf)f(<<)h(endl;)215 781
2519 y(unlink)f(\("/tmp/socket+-"\);)215 831 y(return)g(0;)120 881
2520 y(})120 1018 y(//)h(tsunwrite.cc)120 1067 y(#include)f(<sockunix.h>)120
2521 1117 y(int)g(main)h(\(\))120 1167 y({)215 1217 y(osockunix)f(os)h
2522 (\(sockbuf::sock_stream\);)215 1267 y(os->connect)f(\("/tmp/socket++"\);)215
2523 1316 y(os)h(<<)g("Hello!!!\\n")e(<<)h(flush;)215 1366 y(return)g(0;)120
2524 1416 y(})p eop
2525 %%Page: 33 35
2526 bop 0 -58 a Fn(Chapter)15 b(9:)k(pip)q(estream)d(Classes)1297
2527 b(33)0 183 y Fk(9)41 b(pip)r(estream)14 b(Classes)62 370 y
2528 Fo(pipestream)e Fn(stream)h(classes)h(pro)o(vide)f(the)h(services)g(of)f(the)
2529 g Fi(UNIX)19 b Fn(system)13 b(calls)h Fo(pipe)f Fn(and)g Fo(socketpair)0
2530 432 y Fn(and)g(the)g(C)g(library)h(function)g Fo(popen)p Fn(.)k
2531 Fo(ipipestream)p Fn(,)12 b Fo(opipestream)p Fn(,)f(and)i Fo(iopipestream)f
2532 Fn(are)g(obtained)i(b)o(y)0 495 y(simply)k(deriving)h(from)d
2533 Fo(isockstream)p Fn(,)f Fo(osockstream)h Fn(and)h Fo(iosockstream)e
2534 Fn(resp)q(ectiv)o(ely)l(.)27 b(See)18 b(Chapter)e(8)0 557 y([so)q(c)o
2535 (kstream)e(Classes],)g(page)h(26)g(for)g(details.)62 694 y(In)h(what)f(follo)
2536 o(ws,)25 831 y Fl(\000)30 b Fo(ip)15 b Fn(is)h(an)f Fo(ipipestream)e
2537 Fn(ob)s(ject)25 905 y Fl(\000)30 b Fo(op)15 b Fn(is)h(an)f
2538 Fo(opipestream)e Fn(ob)s(ject)25 980 y Fl(\000)30 b Fo(iop)15
2539 b Fn(is)g(an)h Fo(iopipestream)d Fn(ob)s(ject)25 1055 y Fl(\000)30
2540 b Fo(cmd)15 b Fn(is)g(a)g(c)o(har*)g(denoting)h(an)f(executable)h(lik)o(e)h
2541 Fo(")p Fn(w)o(c)p Fo(")25 1130 y Fl(\000)30 b Fo(ty)15 b Fn(is)h(of)e(t)o(yp)
2542 q(e)i Fo(sockbuf::type)d Fn(indicating)k(the)e(t)o(yp)q(e)h(of)e(the)i
2543 (connection)25 1204 y Fl(\000)30 b Fo(proto)14 b Fn(is)i(an)f
2544 Fo(int)g Fn(denoting)h(a)f(proto)q(col)g(n)o(um)o(b)q(er)0
2545 1341 y Fo(ipipestream)f(ip\(cmd\))240 1416 y Fn(construct)22
2546 b(an)f Fo(ipipestream)g Fn(ob)s(ject)g Fo(ip)g Fn(suc)o(h)h(that)g(the)f
2547 (output)h(of)f(the)h(command)g Fo(cmd)f Fn(is)240 1478 y(a)o(v)m(ailable)c
2548 (as)e(input)h(through)f Fo(ip)p Fn(.)0 1553 y Fo(opipestream)f(op\(cmd\))240
2549 1628 y Fn(construct)h(an)g Fo(opipestream)e Fn(ob)s(ject)h
2550 Fo(op)h Fn(suc)o(h)g(that)f(the)i(input)f(for)g(the)g(command)g
2551 Fo(cmd)f Fn(can)h(b)q(e)240 1690 y(send)h(through)f Fo(op)p
2552 Fn(.)0 1765 y Fo(iopipestream)f(iop\(cmd\))240 1839 y Fn(construct)22
2553 b(an)f Fo(iopipestream)f Fn(ob)s(ject)i Fo(iop)f Fn(suc)o(h)h(that)f(the)h
2554 (input)h(and)f(the)g(output)g(to)f(the)240 1902 y(command)15
2555 b Fo(cmd)g Fn(can)g(b)q(e)h(sen)o(t)f(and)g(receiv)o(ed)i(through)e
2556 Fo(iop)p Fn(.)0 1976 y Fo(iopipestream)f(iop\(ty,)g(proto\))240
2557 2051 y Fn(construct)20 b(a)h Fo(iopipestream)e Fn(ob)s(ject)h
2558 Fo(iop)g Fn(whose)h(so)q(c)o(k)o(et)f(is)h(a)g(so)q(c)o(k)o(etpair)f(of)g(t)o
2559 (yp)q(e)h Fo(ty)g Fn(with)240 2113 y(proto)q(col)15 b(n)o(um)o(b)q(er)g
2560 Fo(proto)p Fn(.)k Fo(ty)c Fn(defaults)h(to)e Fo(sockbuf::sock_stream)e
2561 Fn(and)k Fo(proto)e Fn(defaults)i(to)240 2176 y(0.)k(Ob)s(ject)15
2562 b Fo(iop)g Fn(can)g(b)q(e)h(used)g(either)f(as)g(a)g Fo(pipe)g
2563 Fn(or)f(as)h(a)g Fo(socketpair)p Fn(.)0 2250 y Fo(iop.pid)f(\(\))240
2564 2325 y Fn(return)g(the)g(pro)q(cess)g(id)h(of)f(the)g(c)o(hild)h(if)g(the)f
2565 (curren)o(t)g(pro)q(cess)g(is)g(the)g(paren)o(t)g(or)g(return)f(0.)20
2566 b(If)14 b(the)240 2387 y(pro)q(cess)h(has)h(not)e(fork)o(ed)h(y)o(et,)f
2567 (return)i(-1.)0 2462 y Fo(iopipestream::fork)d(\(\))240 2537
2568 y(fork\(\))k Fn(is)i(a)e(static)h(function)h(of)e(class)i Fo(iopipestream)p
2569 Fn(.)26 b Fo(fork\(\))17 b Fn(forks)h(the)g(curren)o(t)g(pro)q(cess)240
2570 2599 y(and)13 b(appropriately)h(sets)e(the)h Fo(cpid)f Fn(\014eld)i(of)f(the)
2571 g Fo(iopipestream)e Fn(ob)s(jects)h(that)g(ha)o(v)o(e)h(not)f(fork)o(ed)240
2572 2661 y(y)o(et.)p eop
2573 %%Page: 34 36
2574 bop 0 -58 a Fn(Chapter)15 b(9:)k(pip)q(estream)d(Classes)1297
2575 b(34)0 183 y Fm(9.1)33 b(pip)r(estream)15 b(as)g(pip)r(e)62
2576 321 y Fo(pipe)g Fn(is)h(used)f(to)g(comm)o(unicate)g(b)q(et)o(w)o(een)h
2577 (paren)o(t)f(and)g(c)o(hild)i(pro)q(cesses)f(in)g(the)f Fi(unix)k
2578 Fn(domain.)62 458 y(The)d(follo)o(wing)h(example)g(illustrates)g(ho)o(w)e(to)
2579 h(use)g Fo(iopipestream)e Fn(class)j(as)e(a)h Fo(pipe)p Fn(.)22
2580 b(The)16 b(paren)o(t)f(sends)0 521 y(the)g(string)h Fo(")p
2581 Fn(I)f(am)g(the)h(paren)o(t)p Fo(")f Fn(to)f(the)i(c)o(hild)h(and)e(receiv)o
2582 (es)h(the)g(string)f Fo(")p Fn(I)h(am)f(the)g(c)o(hild)p Fo(")i
2583 Fn(from)e(c)o(hild.)22 b(The)0 583 y(c)o(hild,)e(in)e(turn,)g(receiv)o(es)h
2584 (the)f(string)g Fo(")p Fn(I)g(am)f(the)h(paren)o(t)p Fo(")f
2585 Fn(from)g(paren)o(t)h(and)g(sends)g(the)g(string)f Fo(")p Fn(I)i(am)e(the)0
2586 645 y(c)o(hild)p Fo(")j Fn(to)e(the)h(paren)o(t.)30 b(Note)18
2587 b(the)h(same)g Fo(iopipestream)e Fn(ob)s(ject)h(is)h(used)g(for)f(input)i
2588 (and)f(output)f(in)i(eac)o(h)0 708 y(pro)q(cess.)120 845 y
2589 Fo(#include)j(<pipestream.h>)120 945 y(int)g(main\(\))120 995
2590 y({)311 1044 y(iopipestream)f(p;)311 1094 y(if)h(\()h(p.fork\(\))f(\))h({)502
2591 1144 y(char)f(buf[128];)502 1194 y(p)h(<<)f("I)h(am)f(the)h(parent\\n")e(<<)i
2592 (flush;)502 1244 y(cout)f(<<)h("parent:)e(";)502 1293 y(while\(p)h(>>)g
2593 (buf\))693 1343 y(cout)g(<<)h(buf)f(<<)h(')f(';)502 1393 y(cout)g(<<)h(endl;)
2594 311 1443 y(}else)f({)502 1493 y(char)g(buf[128];)502 1542 y(p.getline\(buf,)f
2595 (127\);)502 1592 y(cout)h(<<)h("child:)f(")g(<<)h(buf)f(<<)h(endl;)502
2596 1642 y(p)g(<<)f("I)h(am)f(the)h(child\\n")f(<<)g(flush;)311
2597 1692 y(})311 1742 y(return)g(0;)120 1792 y(})0 2021 y Fm(9.2)33
2598 b(pip)r(estream)15 b(as)g(so)r(c)n(k)n(etpair)62 2159 y Fn(Lik)o(e)23
2599 b(pip)q(es,)j(so)q(c)o(k)o(etpairs)c(also)g(allo)o(w)g(comm)o(unication)h(b)q
2600 (et)o(w)o(een)g(paren)o(t)f(and)g(c)o(hild)i(pro)q(cesses.)42
2601 b(But)0 2221 y(so)q(c)o(k)o(etpairs)15 b(are)f(more)h(\015exible)i(than)e
2602 (pip)q(es)h(in)g(the)f(sense)g(that)f(they)h(let)h(the)f(users)g(c)o(ho)q
2603 (ose)g(the)g(so)q(c)o(k)o(et)f(t)o(yp)q(e)0 2283 y(and)h(proto)q(col.)62
2604 2421 y(The)f(follo)o(wing)h(example)g(illustrates)g(the)f(use)g(of)g
2605 Fo(iopipestream)e Fn(class)j(as)e(a)h Fo(socketpair)e Fn(whose)i(t)o(yp)q(e)g
2606 (is)0 2483 y Fo(sockbuf::sock_dgram)p Fn(.)i(The)d(paren)o(t)f(sends)h(the)f
2607 (string)h Fo(")p Fn(I)f(am)g(the)h(paren)o(t)p Fo(")f Fn(to)f(the)i(c)o(hild)
2608 h(and)f(receiv)o(es)g(the)0 2545 y(string)h Fo(")p Fn(I)h(am)f(the)g(c)o
2609 (hild)p Fo(")i Fn(from)e(the)g(c)o(hild.)21 b(The)15 b(c)o(hild,)h(in)f
2610 (turn,)f(receiv)o(es)h(and)g(sends)g(the)f(strings)g Fo(")p
2611 Fn(I)h(am)f(the)0 2608 y(paren)o(t)p Fo(")i Fn(and)g Fo(")p
2612 Fn(I)g(am)g(the)g(c)o(hild)p Fo(")i Fn(resp)q(ectiv)o(ely)g(from)d(and)i(to)e
2613 (the)i(paren)o(t.)22 b(Note)16 b(in)h(the)f(follo)o(wing)h(example)0
2614 2670 y(that)d(the)i(same)f Fo(iopipestream)e Fn(ob)s(ject)i(is)h(used)f(for)g
2615 (b)q(oth)g(the)g(input)i(and)e(the)g(output)g(in)h(eac)o(h)g(pro)q(cess.)p
2616 eop
2617 %%Page: 35 37
2618 bop 0 -58 a Fn(Chapter)15 b(9:)k(pip)q(estream)d(Classes)1297
2619 b(35)120 183 y Fo(#include)23 b(<pipestream.h>)120 283 y(int)g(main\(\))120
2620 333 y({)311 382 y(iopipestream)f(p\(sockbuf::sock_dgram\);)311
2621 432 y(if)h(\()h(iopipestream::fork\(\))d(\))j({)502 482 y(char)f(buf[128];)
2622 502 532 y(p)h(<<)f("I)h(am)f(the)h(parent\\n")e(<<)i(flush;)502
2623 582 y(p.getline\(buf,)e(127\);)502 632 y(cout)h(<<)h("parent:)e(")i(<<)g(buf)
2624 f(<<)h(endl;)311 681 y(}else)f({)502 731 y(char)g(buf[128];)502
2625 781 y(p.getline\(buf,)f(127\);)502 831 y(cout)h(<<)h("child:)f(")g(<<)h(buf)f
2626 (<<)h(endl;)502 881 y(p)g(<<)f("I)h(am)f(the)h(child\\n")f(<<)g(flush;)311
2627 930 y(})311 980 y(return)g(0;)120 1030 y(})0 1276 y Fm(9.3)33
2628 b(pip)r(estream)15 b(as)g(p)r(op)r(en)62 1415 y Fo(popen)c
2629 Fn(is)h(used)f(to)g(call)h(an)g(executable)g(and)f(send)h(inputs)h(and)e
2630 (outputs)g(to)g(that)f(executable.)20 b(F)l(or)10 b(example,)0
2631 1477 y(the)15 b(follo)o(wing)h(example)g(executes)g Fo(")p
2632 Fn(/bin/date)p Fo(")p Fn(,)f(gets)g(its)g(output,)g(and)g(prin)o(ts)g(it)h
2633 (to)f(stdout.)120 1617 y Fo(#include)23 b(<pipestream.h>)120
2634 1716 y(int)g(main)h(\(\))120 1766 y({)215 1816 y(char)g(buf[128];)215
2635 1866 y(ipipestream)f(p\("/bin/date"\);)215 1965 y(p.getline)g(\(buf,)g
2636 (127\);)215 2015 y(cout)h(<<)f(buf)h(<<)f(endl;)215 2065 y(return)g(0;)120
2637 2115 y(})62 2331 y Fn(Here)16 b(is)f(an)h(example)g(that)e(prin)o(ts)h
2638 Fo(")p Fn(Hello)i(W)l(orld!!)p Fo(")d Fn(on)i(stdout.)j(It)c(uses)h
2639 Fo(opipestream)d Fn(ob)s(ject.)120 2471 y Fo(#include)23 b(<pipestream.h>)120
2640 2570 y(int)g(main)h(\(\))120 2620 y({)215 2670 y(opipestream)f
2641 (p\("/bin/cat"\);)p eop
2642 %%Page: 36 38
2643 bop 0 -58 a Fn(Chapter)15 b(9:)k(pip)q(estream)d(Classes)1297
2644 b(36)215 183 y Fo(p)24 b(<<)g("Hello)f(World!!\\n")f(<<)i(endl;)215
2645 233 y(return)f(0;)120 283 y(})62 495 y Fn(The)16 b(follo)o(wing)g(example)g
2646 (illustrates)g(the)f(use)h(of)e Fo(iopipestream)g Fn(for)h(b)q(oth)g(input)h
2647 (and)f(output.)120 632 y Fo(#include)23 b(<pipestream.h>)120
2648 731 y(int)g(main\(\))120 781 y({)311 831 y(char)g(buf[128];)311
2649 881 y(iopipestream)f(p\("lpc"\);)311 930 y(p)i(<<)f("help\\nquit\\n")f(<<)i
2650 (flush;)311 980 y(while)f(\()h(p.getline\(buf,)e(127\))h(\))h(cout)f(<<)h
2651 (buf)f(<<)h(endl;)311 1030 y(return)f(0;)120 1080 y(})p eop
2652 %%Page: 37 39
2653 bop 0 -58 a Fn(Chapter)15 b(10:)k(F)l(ork)c(Class)1440 b(37)0
2654 183 y Fk(10)41 b(F)-7 b(ork)15 b(Class)62 370 y Fn(Y)l(ou)h(can)f(e\013ectiv)
2655 o(ely)i(use)f(the)f Fo(Fork)g Fn(wrapp)q(er)g(class)h(to)f(create)g(c)o(hild)
2656 i(pro)q(cesses.)k(Y)l(ou)16 b(can)f(use)h(the)g Fo(Fork)0 432
2657 y Fn(class,)f(instead)h(of)f(directly)h(using)g(the)g(system)e(call)j(fork)d
2658 (\(\),)g(if)i(y)o(ou)f(desire)h(the)f(follo)o(wing:)37 569
2659 y Fl(\017)30 b Fn(Av)o(oid)16 b(zom)o(bie)f(pro)q(cesses)37
2660 644 y Fl(\017)30 b Fn(Optionally)17 b(kill)g(c)o(hild)g(pro)q(cesses)e(when)h
2661 (the)f(paren)o(t)g(pro)q(cess)h(terminates.)37 719 y Fl(\017)30
2662 b Fn(W)l(an)o(t)14 b(to)h(kno)o(w)g(the)g(reason)g(for)f(abnormal)i
2663 (termination)f(of)g(c)o(hild)i(pro)q(cesses.)62 930 y(In)f(what)f(follo)o
2664 (ws,)25 1067 y Fl(\000)30 b Fo(killchild)14 b Fn(is)i(an)f(in)o(teger.)25
2665 1142 y Fl(\000)30 b Fo(reason)14 b Fn(is)i(an)f(in)o(teger.)25
2666 1217 y Fl(\000)30 b Fo(signo)14 b Fn(is)i(a)f(v)m(alid)i(signal.)25
2667 1291 y Fl(\000)30 b Fo(f)15 b Fn(is)h(a)f Fo(Fork)f Fn(ob)s(ject.)0
2668 1428 y Fo(Fork)h(f\(killchild,)e(reason\))240 1503 y Fn(constructs)i(a)g
2669 Fo(Fork)g Fn(ob)s(ject)f Fo(f)p Fn(.)20 b(The)c(constructor)e(creates)h(a)g
2670 (c)o(hild)i(pro)q(cess.)j(When)c(the)f(paren)o(t)240 1565 y(pro)q(cess)h
2671 (terminates,)g(it)h(will)g(kill)h(the)e(c)o(hild)i(pro)q(cess)e(if)h
2672 Fo(killchild)e Fn(is)h(not)g(0.)22 b(Otherwise,)17 b(the)240
2673 1628 y(paren)o(t)c(pro)q(cess)g(will)i(w)o(ait)d(un)o(til)j(all)f(its)f(c)o
2674 (hild)i(pro)q(cesses)e(die.)20 b(If)14 b Fo(reason)e Fn(is)i(not)e(0,)h(then)
2675 g(it)h(giv)o(es)240 1690 y(the)h(reason)g(for)g(a)g(c)o(hild)h(pro)q(cess's)f
2676 (death)h(on)f(the)g(stderr.)0 1765 y Fo(f.is_child)f(\(\))240
2677 1839 y Fn(returns)j(1)f(if)i(the)f(curren)o(t)g(pro)q(cess)g(is)g(the)g(c)o
2678 (hild)i(pro)q(cess)e(follo)o(wing)h(the)f(fork)f(in)i(constructing)240
2679 1902 y(the)d Fo(Fork)g Fn(ob)s(ject)g Fo(f)p Fn(.)k(Otherwise,)d(return)f(0.)
2680 0 1976 y Fo(f.is_parent)f(\(\))240 2051 y Fn(returns)g(1)h(if)g(the)f(curren)
2681 o(t)h(pro)q(cess)g(is)g(the)f(paren)o(t)h(pro)q(cess)f(follo)o(wing)i(the)e
2682 (fork)g(in)i(constructing)240 2113 y(the)f Fo(Fork)g Fn(ob)s(ject)g
2683 Fo(f)p Fn(.)k(Otherwise,)d(return)f(0.)0 2188 y Fo(f.process_id)f(\(\))240
2684 2263 y Fn(returns)h(the)f(pro)q(cess)h(id)h(of)e(the)h(c)o(hild)h(pro)q
2685 (cess,)f(if)g(the)g(curren)o(t)g(pro)q(cess)g(is)g(the)g(paren)o(t)f(pro)q
2686 (cess.)240 2325 y(Returns)i(0,)e(if)i(the)f(curren)o(t)g(pro)q(cess)h(is)f
2687 (the)h(c)o(hild)h(pro)q(cess.)j(Returns)15 b(-1,)g(if)h(fork)e(failed.)0
2688 2400 y Fo(Fork::suicide_signal)e(\(signo\))240 2474 y Fn(is)k(a)f(static)h
2689 (function.)22 b(Up)q(on)16 b(the)f(reciept)i(of)e(the)h(signal)g
2690 Fo(signo)p Fn(,)f(the)h(curren)o(t)f(pro)q(cess)h(will)h(kill)240
2691 2537 y(all)e(its)f(c)o(hild)i(pro)q(cesses)e(created)g(through)g
2692 Fo(Fork::Fork\(int,)f(int\))h Fn(irresp)q(ectiv)o(e)h(of)f(the)g(v)m(alue)240
2693 2599 y(of)h(the)h Fo(killchild)f Fn(\015ag)g(used)h(in)h(the)f(construction)g
2694 (of)f(the)h Fo(Fork)f Fn(ob)s(jects.)21 b Fo(signo)15 b Fn(defaults)i(to)240
2695 2661 y(SIGTERM)e(signal.)p eop
2696 %%Page: 38 40
2697 bop 0 -58 a Fn(Chapter)15 b(10:)k(F)l(ork)c(Class)1440 b(38)0
2698 183 y Fm(10.1)32 b(F)-6 b(ork)17 b(Example)62 336 y Fn(The)g(follo)o(wing)g
2699 (example)g(illustrates)h(the)e(use)h(of)f(the)h Fo(Fork)e Fn(class)i(to)f
2700 (create)g(c)o(hild)i(pro)q(cesses.)24 b(First,)16 b(w)o(e)0
2701 398 y(set)e(up)i Fi(SIGTERM)j Fn(signal)d(handler)g(to)e(kill)i(all)g(the)f
2702 (c)o(hild)h(pro)q(cesses,)f(b)o(y)g(callling)i Fo(Fork::suicide_signal)0
2703 460 y(\(\))p Fn(.)j(Second,)15 b(w)o(e)g(create)g(sev)o(eral)g(c)o(hild)i
2704 (and)f(grandc)o(hild)g(pro)q(cesses.)62 612 y(Y)l(ou)g(can)f(kill)j(the)d
2705 (top)g(most)g(paren)o(t)g(pro)q(cess)g(and)h(all)g(its)g(c)o(hildren)h(b)o(y)
2706 e(sending)i(a)e Fi(SIGTERM)20 b Fn(signal)d(to)0 675 y(the)e(top)g(most)f
2707 (paren)o(t)h(pro)q(cess.)120 827 y Fo(//)24 b(tfork.C)120 877
2708 y(#include)f(<iostream.h>)120 927 y(#include)g(<Fork.h>)120
2709 1026 y(static)g(void)g(print)h(\(char*)f(name,)g(pid_t)g(child\))120
2710 1076 y({)168 1126 y(if)g(\(child\))215 1176 y(cerr)h(<<)f("Parent)g(")h(<<)g
2711 (getppid)e(\(\))i(<<)g(";)f(")263 1225 y(<<)h(name)f(<<)h(')f(')h(<<)g
2712 (getpid)f(\(\))g(<<)h(";)g(Child)f(")g(<<)h(child)f(<<)h(";\\n";)120
2713 1275 y(})120 1375 y(int)f(main)h(\(int)f(ac,)h(char**)f(av\))120
2714 1425 y({)168 1474 y(Fork::suicide_signal)e(\(SIGTERM\);)168
2715 1574 y(Fork)i(a\(0,)g(1\);)168 1674 y(print)g(\("a",)g(a.process_id)f
2716 (\(\)\);)168 1773 y(if)h(\(a.is_child)g(\(\)\))g({)215 1823
2717 y(sleep)h(\(3000\);)168 1873 y(})f(else)h(if)f(\(a.is_parent)g(\(\)\))g({)215
2718 1923 y(Fork)h(b)f(\(1,)h(1\);)215 1973 y(print)g(\("b",)f(b.process_id)f
2719 (\(\)\);)215 2022 y({)263 2072 y(Fork)h(c)h(\(b.is_parent)e(\(\),)i(1\);)263
2720 2122 y(if)g(\(b.is_child)e(\(\)\))120 2172 y(print)h(\("cchild",)g
2721 (c.process_id)f(\(\)\);)263 2222 y(else)120 2271 y(print)h(\("cparent",)g
2722 (c.process_id)f(\(\)\);)263 2321 y(if)i(\(c.is_child)e(\(\)\))i({)120
2723 2371 y(sleep)f(\(3000\);)120 2421 y(return)g(0;)263 2471 y(})215
2724 2521 y(})215 2570 y(if)h(\(b.is_child)e(\(\)\))i({)263 2620
2725 y(sleep)f(\(120\);)263 2670 y(return)g(0x8;)p eop
2726 %%Page: 39 41
2727 bop 0 -58 a Fn(Chapter)15 b(10:)k(F)l(ork)c(Class)1440 b(39)215
2728 183 y Fo(})168 233 y(})168 333 y(return)23 b(0;)120 382 y(})p
2729 eop
2730 %%Page: 40 42
2731 bop 0 -58 a Fn(Chapter)15 b(11:)k(Class)c(proto)q(col)1368
2732 b(40)0 183 y Fk(11)41 b(Class)15 b(proto)r(col)62 382 y Fo(protocol)i
2733 Fn(class)h(is)h(the)f(base)g(class)g(for)f(all)i(the)f(other)f(application)j
2734 (proto)q(col)e(classes)g(lik)o(e)h Fo(echo)p Fn(,)f Fo(smtp)p
2735 Fn(,)0 444 y(etc.)h Fo(protocol)13 b Fn(is)i(deriv)o(ed)f(publicly)j(from)c
2736 Fo(iosockstream)p Fn(.)18 b(It)c(uses)g Fo(protocolbuf)e Fn(class,)i(a)g
2737 (nested)g(class)g(of)0 506 y Fo(protocol)p Fn(,)g(as)g(its)i(stream)e
2738 (bu\013er.)62 646 y(The)g Fo(protocol)e Fn(class)h(is)h(an)f(abstract)g
2739 (class)g(and)h(th)o(us,)f(y)o(ou)g(cannot)g(instan)o(tiate)g(an)g(ob)s(ject)g
2740 (of)f Fo(protocol)p Fn(.)0 891 y Fm(11.1)32 b(Class)14 b(proto)r(col::proto)r
2741 (colbuf)62 1030 y Fo(protocol::protocolbuf)i Fn(class)k(is)f(publicly)j
2742 (deriv)o(ed)e(from)e Fo(sockinetbuf)g Fn(and)h(th)o(us,)g(it)h(inherits)g
2743 (all)0 1093 y(the)c(latter's)f(public)j(mem)o(b)q(er)e(functions.)23
2744 b(In)16 b(addition,)h(the)f Fo(protocolbuf)e Fn(de\014nes)j(the)f(follo)o
2745 (wing)h(mem)o(b)q(er)0 1155 y(functions.)62 1294 y(In)f(what)f(follo)o(ws,)25
2746 1434 y Fl(\000)30 b Fo(p)15 b Fn(is)h(an)f(ob)s(ject)f(of)h(a)g(non-abstract)
2747 g(class)g(deriv)o(ed)h(from)f Fo(protocolbuf)p Fn(.)25 1511
2748 y Fl(\000)30 b Fo(pname)14 b Fn(is)i(the)f(transp)q(ort)g(proto)q(col)g(name)
2749 g(whic)o(h)h(is)g(either)g Fo(protocol::tcp)d Fn(or)i Fo(protocol::udp)p
2750 Fn(.)25 1588 y Fl(\000)30 b Fo(addr)15 b Fn(is)g(an)g(unsigned)i(long)f
2751 (denoting)f(the)h(v)m(alid)h(address)e(of)g(a)f(mac)o(hine)j(in)f(host)e(b)o
2752 (yte)h(order.)25 1665 y Fl(\000)30 b Fo(host)15 b Fn(is)g(a)g(c)o(har)g
2753 (string)g(denoting)h(the)f(name)h(of)e(a)h(mac)o(hine)h(lik)o(e)h
2754 Fo(")p Fn(k)o(elvin.seas.virginia.edu)p Fo(")p Fn(.)25 1742
2755 y Fl(\000)30 b Fo(portno)14 b Fn(is)i(an)f(in)o(t)h(and)f(denotes)g(the)h(p)q
2756 (ort)f(n)o(um)o(b)q(er)g(in)h(host)f(b)o(yte)g(order.)0 1881
2757 y Fo(protocol::protocolbuf::pro)o(tocolbu)o(f)e(\(pname\))240
2758 1958 y Fn(constructs)i Fo(protocolbuf)e Fn(ob)s(ject)i(with)h(the)f(transp)q
2759 (ort)f(proto)q(col)h(set)g(to)g Fo(pname)p Fn(.)0 2036 y Fo(p.protocol_name)e
2760 (\(\))240 2113 y Fn(returns)i(the)g(name)h(of)e(the)i(transp)q(ort)e(proto)q
2761 (col)h(of)g Fo(p)g Fn(as)g(a)g(c)o(har)f(string.)0 2190 y Fo(p.rfc_name)g
2762 (\(\))240 2267 y Fn(returns)25 b(the)h(name)f(of)g(the)g(application)i(proto)
2763 q(col)f(name)f(of)g Fo(p)g Fn(as)g(a)g(c)o(har)g(string.)51
2764 b Fo(pro-)240 2329 y(tocolbuf::rfc_name)13 b(\(\))26 b Fn(is)h(a)f(pure)h
2765 (virtual)g(function;)32 b(th)o(us,)d(an)o(y)d(class)g(deriv)o(ed)i(from)240
2766 2391 y Fo(protocol::protocolbuf)12 b Fn(should)k(pro)o(vide)g(a)f
2767 (de\014nition)i(for)e Fo(protocolbuf::rfc_name)d(\(\))p Fn(.)0
2768 2468 y Fo(p.rfc_doc)i(\(\))240 2545 y Fn(returns)21 b(the)g(RF)o(C)f(do)q
2769 (cumen)o(t)i(name)f(of)f(the)h(application)i(proto)q(col)d(of)h
2770 Fo(p)g Fn(as)f(a)h(c)o(har)f(string.)240 2608 y Fo(protocolbuf::rfc_doc)12
2771 b(\(\))22 b Fn(is)g(a)g(pure)g(virtual)h(function;)j(th)o(us,)d(an)o(y)e
2772 (class)i(deriv)o(ed)g(from)240 2670 y Fo(protocol::protocolbuf)12
2773 b Fn(should)k(pro)o(vide)g(a)f(de\014nition)i(for)e Fo(protocolbuf::rfc_doc)d
2774 (\(\))p Fn(.)p eop
2775 %%Page: 41 43
2776 bop 0 -58 a Fn(Chapter)15 b(11:)k(Class)c(proto)q(col)1368
2777 b(41)0 183 y Fo(p.serve_clients)13 b(\(portno\))240 258 y Fn(con)o(v)o(erts)j
2778 Fo(p)g Fn(in)o(to)g(a)g(serv)o(er.)23 b(Use)17 b(the)g(p)q(ort)f(sp)q
2779 (eci\014ed)i(in)f Fo(/etc/services)e Fn(for)h(the)g(application)240
2780 320 y(if)i Fo(portno)f(<)g Fn(0.)26 b(Use)18 b(a)f(default)h(p)q(ort)f(if)h
2781 Fo(0)d(<=)g(portno)f(<=)h(1024)p Fn(.)26 b(Otherwise,)19 b(use)f
2782 Fo(portno)e Fn(as)240 382 y(the)e(p)q(ort)g(to)g(accept)g(clien)o(ts)i
2783 (requesting)f(service.)20 b Fo(protocolbuf::serve_clients\(\))11
2784 b Fn(is)j(pure)240 445 y(virtual)h(function;)g(th)o(us,)f(an)o(y)g(class)h
2785 (deriv)o(ed)g(from)f Fo(protocol::protocolbuf)d Fn(should)k(pro)o(vide)240
2786 507 y(a)g(de\014nition)i(for)d Fo(protocolbuf::serve_clients\(\))p
2787 Fn(.)240 582 y(Please)i(do)f(not)g(c)o(hange)g(the)g(meaning)h(of)f
2788 Fo(portno)f Fn(when)i(y)o(ou)f(deriv)o(e)h(y)o(our)e(o)o(wn)h(class.)0
2789 656 y Fo(p.bind)f(\(\))34 b Fn(same)15 b(as)g Fo(p.serve_clients)e(\(-1\))p
2790 Fn(.)0 731 y Fo(p.connect)h(\(\))240 806 y Fn(connects)i(to)e(the)h(lo)q(cal)
2791 i(host's)d(serv)o(er)h(for)f(the)i(application.)21 b Fo(p)15
2792 b Fn(acts)g(as)g(the)g(clien)o(t.)0 881 y Fo(p.connect)f(\(addr\))240
2793 955 y Fn(connects)h(to)e(the)h(serv)o(er)g(running)h(at)f(the)g(mac)o(hine)h
2794 (with)g(address,)f Fo(addr)p Fn(.)k Fo(p)c Fn(acts)g(as)g(the)g(clien)o(t.)0
2795 1030 y Fo(p.connect)g(\(host\))240 1105 y Fn(connects)i(to)e(the)h(serv)o(er)
2796 g(running)i(at)d(the)h(mac)o(hine,)h Fo(host)p Fn(.)j Fo(p)c
2797 Fn(acts)g(as)g(the)g(clien)o(t.)0 1180 y Fo(p.connect)f(\(host,)g(portno\))
2798 240 1254 y Fn(connects)19 b(to)e(the)i(serv)o(er)f(servicing)i(clien)o(ts)f
2799 (at)f Fo(portno)f Fn(at)h(the)g(mac)o(hine,)i Fo(host)p Fn(.)29
2800 b(Unlik)o(e)20 b(this)240 1316 y(connect)13 b(call,)g(the)f(other)g(v)m
2801 (arian)o(ts)g(of)g(connect)g(uses)g(the)h(p)q(ort)e(sp)q(eci\014ed)k(in)e
2802 (the)f Fo(/etc/services)240 1379 y Fn(\014le.)p eop
2803 %%Page: 42 44
2804 bop 0 -58 a Fn(Chapter)15 b(12:)k(Ec)o(ho)c(Class)1433 b(42)0
2805 183 y Fk(12)41 b(Ec)n(ho)15 b(Class)62 374 y Fn(The)g Fo(echo)g
2806 Fn(class)g(implemen)o(ts)h(RF)o(C)f(862.)j(An)e Fo(echo)e Fn(ob)s(ject,)g(as)
2807 g(a)h(clien)o(t,)h(will)g(get)f(bac)o(k)g(what)f(ev)o(er)h(data)0
2808 437 y(it)f(sends)f(to)g(an)g Fo(echo)g Fn(serv)o(er.)19 b(Similarly)l(,)c(an)
2809 f Fo(echo)e Fn(ob)s(ject,)h(as)g(a)g(serv)o(er,)g(will)i(ec)o(ho)e(bac)o(k)h
2810 (the)f(data)g(it)g(receiv)o(es)0 499 y(from)h(its)i(clien)o(t.)62
2811 637 y(The)i Fo(echo)f Fn(class)h(is)g(deriv)o(ed)g(from)f Fo(protocol)g
2812 Fn(class,)h(and)f(uses)h Fo(echo::echobuf)e Fn(as)h(its)h(stream)e(bu\013er.)
2813 0 699 y Fo(echo::echobuf)d Fn(is)j(in)g(turn)f(is)h(deriv)o(ed)g(from)f
2814 Fo(protocol::protcolbuf)p Fn(.)62 837 y(In)h(what)f(follo)o(ws,)25
2815 975 y Fl(\000)30 b Fo(e)15 b Fn(is)h(a)f Fo(echo)f Fn(ob)s(ject.)25
2816 1051 y Fl(\000)30 b Fo(pname)14 b Fn(is)i(a)f(transp)q(ort)f(proto)q(col)h
2817 (name)h(and)f(m)o(ust)g(b)q(e)h(either)f Fo(protocol::tcp)f
2818 Fn(or)h Fo(protocol::udp)p Fn(.)0 1188 y Fo(echo)g(e)g(\(pname\))240
2819 1264 y Fn(constructs)g(the)g Fo(echo)g Fn(ob)s(ject,)f Fo(e)h
2820 Fn(with)g Fo(pname)g Fn(as)g(its)g(transp)q(ort)f(proto)q(col)i(name.)0
2821 1340 y Fo(echo::operator)d(->)i(\(\))240 1415 y Fn(an)g Fo(echo)g
2822 Fn(ob)s(ject)f(is)i(a)f(smart)f(p)q(oin)o(ter)i(for)e(the)i(underlying)h
2823 Fo(echobuf)p Fn(.)0 1631 y Fg(12.0.1)29 b(tsec)n(ho.C)120 1769
2824 y Fo(//)24 b(echo)f(server.)g(Serves)g(clients)g(at)g(port)h(4000.)120
2825 1818 y(#include)f(<echo.h>)120 1868 y(#include)g(<stdlib.h>)120
2826 1968 y(int)g(main)h(\(\))120 2018 y({)168 2068 y(echo)f(server)g
2827 (\(protocol::tcp\);)168 2117 y(server->serve_clients)e(\(4000\);)168
2828 2167 y(return)i(1;)120 2217 y(})0 2432 y Fg(12.0.2)29 b(tcec)n(ho.C)120
2829 2570 y Fo(//)24 b(echo)f(client.)g(Sends)g("mary)g(had)h(a)f(litte)h(lamb")f
2830 (to)g(the)h(server)120 2620 y(#include)f(<echo.h>)120 2670
2831 y(#include)g(<stdlib.h>)p eop
2832 %%Page: 43 45
2833 bop 0 -58 a Fn(Chapter)15 b(12:)k(Ec)o(ho)c(Class)1433 b(43)120
2834 233 y Fo(int)23 b(main)h(\(\))120 283 y({)168 333 y(echo)f
2835 (e\(protocol::tcp\);)168 432 y(e->connect)f(\("kelvin.seas.virginia.edu",)e
2836 (4000\);)168 532 y(cout)j(<<)h(e->rfc_name)e(\(\))i(<<)f(')h(')g(<<)f
2837 (e->rfc_doc)g(\(\))g(<<)h(endl;)168 632 y(e)f(<<)h("mary)f(had)h(a)f(little)g
2838 (lamb\\r\\n")g(<<)h(flush;)168 731 y(char)f(buf)g([256];)168
2839 781 y(e.getline)f(\(buf,)i(255\);)168 881 y(cout)f(<<)h("got)f(back:)g(")h
2840 (<<)f(buf)h(<<)f(endl;)168 930 y(return)g(0;)120 980 y(})p
2841 eop
2842 %%Page: 44 46
2843 bop 0 -58 a Fn(Chapter)15 b(13:)k(SMTP)c(Class)1400 b(44)0
2844 183 y Fk(13)41 b(SMTP)15 b(Class)62 359 y Fn(The)k Fo(smtp)f
2845 Fn(class,)i(whic)o(h)f(is)h(deriv)o(ed)f(from)f Fo(protocol)g
2846 Fn(class,)i(implemen)o(ts)f(RF)o(C)g(821.)29 b(It)19 b(can)g(b)q(e)g(used)0
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2856 (to)f(an)g Fo(ostream)p Fn(.)25 1111 y Fl(\000)30 b Fo(buf)15
2857 b Fn(is)g(a)g(c)o(har)g(bu\013er)g(of)g(length)h Fo(buflen)p
2858 Fn(.)25 1183 y Fl(\000)30 b Fo(str,)15 b(str0,)f(str1,)h(...)f
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2860 1392 y Fn(constructs)e(an)h Fo(smtp)e Fn(clien)o(t,)j Fo(s)p
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2864 g(resp)q(onse)h(and)f(sends)h(it)f(to)g Fo(io)f Fn(of)h(the)h
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2866 1743 y Fn(concatenates)k(strings)g Fo(str0)p Fn(,)g Fo(str1)p
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2868 (the)240 1805 y(serv)o(er)d(b)q(efore)g(getting)g(its)h(resp)q(onse.)0
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2876 h(of)f(eac)o(h.)p eop
2877 %%Page: 45 47
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2908 eop
2909 %%Page: 46 48
2910 bop 0 -58 a Fn(Chapter)15 b(13:)k(SMTP)c(Class)1400 b(46)168
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2913 %%Page: 47 49
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2926 %%Page: 48 50
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2958 eop
2959 %%Page: 49 51
2960 bop 0 -58 a Fn(Chapter)15 b(15:)k(Pitfalls)1510 b(49)311 183
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2962 %%Page: 50 52
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3124 eop
3125 %%Page: 51 53
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3627 y Fn(13.0.1)43 b(tcsm)o(tp.C)13 b Fa(:)7 b(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)
3628 f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h
3629 (:)f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)28
3630 b Fn(45)0 1676 y Fm(14)66 b(Error)24 b(Handling)7 b Fb(:)12
3631 b(:)e(:)g(:)h(:)f(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)h(:)f(:)g(:)g
3632 (:)g(:)h(:)f(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)h(:)f(:)30
3633 b Fm(47)0 1816 y(15)66 b(Pitfalls)11 b Fb(:)h(:)e(:)g(:)g(:)g(:)h(:)f(:)g(:)g
3634 (:)g(:)h(:)f(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)h(:)f(:)g(:)g(:)g
3635 (:)h(:)f(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)h(:)f(:)g(:)g(:)34
3636 b Fm(48)0 1956 y(Index)7 b Fb(:)12 b(:)e(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h
3637 (:)f(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f
3638 (:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)g(:)g(:)h(:)f(:)g(:)g(:)g(:)h(:)f(:)g
3639 (:)g(:)h(:)f(:)30 b Fm(50)p eop
3640 %%Trailer
3641 end
3642 userdict /end-hook known{end-hook}if
3643 %%EOF