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// pipestream.C -*- C++ -*- socket library |
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// Copyright (C) 1992,1993,1994 Gnanasekaran Swaminathan <gs4t@virginia.edu> |
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// |
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// Permission is granted to use at your own risk and distribute this software |
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// in source and binary forms provided the above copyright |
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// notice and this paragraph are preserved on all copies. |
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// This software is provided "as is" with no express or implied warranty. |
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// |
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// Version: 17Oct95 1.10 |
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|
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#include <config.h> |
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|
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#include <pipestream.h> |
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#include <unistd.h> |
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#include <sys/socket.h> |
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|
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// environ is not given a declaration in sun's <unistd.h> |
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extern char** environ; |
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|
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// child closes s2 and uses s1 |
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// parent closes s1 and uses s2 |
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|
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enum domain { af_unix = 1 }; |
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|
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iopipestream* iopipestream::head = 0; |
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|
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static sockbuf* createpipestream (const char* cmd, int mode) |
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{ |
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int sockets[2]; |
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if ( ::socketpair (af_unix, sockbuf::sock_stream, 0, sockets) == -1 ) { |
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sock_error ("pipestream", "socketpair"); |
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return 0; |
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} |
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|
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pid_t pid = vfork (); |
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if (pid == -1) { |
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sock_error ("pipestream", "fork"); |
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return 0; |
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} |
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|
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if (pid == 0) { |
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// child process |
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if (::close (sockets[1]) == -1) |
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sock_error ("pipestream", "child close 1"); |
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if ((mode & ios::in) && ::dup2 (sockets[0], 1) == -1) { |
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sock_error ("pipestream", "child dup2 1"); |
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_exit (0x70); |
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} |
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if ((mode & ios::out) && ::dup2 (sockets[0], 0) == -1) { |
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sock_error ("pipestream", "child dup2 0"); |
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_exit (0x71); |
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} |
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if (::close (sockets[0]) == -1) |
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sock_error ("pipestream", "child close 0"); |
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const char* argv[4]; |
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argv[0] = "/bin/sh"; |
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argv[1] = "-c"; |
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argv[2] = cmd; |
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argv[3] = 0; |
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execve ("/bin/sh", (char**) argv, environ); |
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sock_error ("pipestream", "execve"); |
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_exit (0x7f); |
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} |
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// parent process |
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sockbuf* s = new sockbuf (sockets[1]); |
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if (::close (sockets[0]) == -1) |
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sock_error ("pipestream", "parent close 0"); |
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if ( !(mode & ios::out) ) s->shutdown (sockbuf::shut_write); |
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if ( !(mode & ios::in) ) s->shutdown (sockbuf::shut_read); |
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return s; |
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} |
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|
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ipipestream::ipipestream (const char* cmd) |
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: ios (0) |
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{ |
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init (createpipestream (cmd, ios::in)); |
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} |
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|
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opipestream::opipestream (const char* cmd) |
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: ios (0) |
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{ |
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init (createpipestream (cmd, ios::out)); |
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} |
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|
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iopipestream::iopipestream (const char* cmd) |
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: ios (0), cpid(-1), next (0) |
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{ |
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init (createpipestream (cmd, ios::in|ios::out)); |
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} |
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|
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iopipestream::iopipestream(sockbuf::type ty, int proto) |
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: ios (0), cpid(-1), next (head) |
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{ |
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if ( ::socketpair(af_unix, ty, proto, sp) == -1 ) { |
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error ("iopipestream-socketpair "); |
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return; |
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} |
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|
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head = this; |
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} |
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|
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pid_t iopipestream::fork() |
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{ |
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pid_t pid = :: vfork (); |
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if ( pid == -1 ) { |
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sock_error ("iopipestream", "fork"); |
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return pid; |
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} else if (pid > 0) { |
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// parent process |
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while (head) { |
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head->cpid = pid; |
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head->init (new sockbuf (head->sp[0])); |
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if (::close (head->sp[1]) == -1) |
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sock_error ("iopipestream", "parent close 0"); |
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head = head->next; |
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} |
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|
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} else { |
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// child process |
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while (head) { |
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head->cpid = 0; |
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head->init (new sockbuf (head->sp[1])); |
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if (::close (head->sp[0]) == -1) |
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sock_error ("iopipestream", "child close 0"); |
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head = head->next; |
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} |
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} |
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return pid; |
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} |
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