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<?xml version="1.0"?> |
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|
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" |
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
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|
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<refentry id="statgrab"> |
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|
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<refentryinfo> |
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<date>$Date: 2004/05/05 10:41:42 $</date> |
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<releaseinfo>$Id: statgrab.xml,v 1.11 2004/05/05 10:41:42 tdb Exp $</releaseinfo> |
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</refentryinfo> |
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|
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<refmeta> |
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<refentrytitle>statgrab</refentrytitle> |
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<manvolnum>3</manvolnum> |
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<refmiscinfo>i-scream</refmiscinfo> |
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</refmeta> |
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|
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<refnamediv> |
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<refname>statgrab</refname> |
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<refpurpose>get system statistics</refpurpose> |
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</refnamediv> |
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|
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<refsynopsisdiv> |
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<funcsynopsis> |
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<funcsynopsisinfo>#include <statgrab.h></funcsynopsisinfo> |
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|
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<funcprototype> |
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<funcdef>int <function>sg_init</function></funcdef> |
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<void/> |
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</funcprototype> |
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<funcprototype> |
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<funcdef>int <function>sg_drop_privileges</function></funcdef> |
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<void/> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_error <function>sg_get_error</function></funcdef> |
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<void/> |
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</funcprototype> |
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<funcprototype> |
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<funcdef>const char *<function>sg_get_error_arg</function></funcdef> |
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<void/> |
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</funcprototype> |
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<funcprototype> |
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<funcdef>int<function>sg_get_error_errno</function></funcdef> |
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<void/> |
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</funcprototype> |
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<funcprototype> |
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<funcdef>const char *<function>sg_str_error</function></funcdef> |
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<paramdef>sg_error <parameter>code</parameter></paramdef> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_cpu_stats *<function>sg_get_cpu_stats</function></funcdef> |
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<void/> |
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</funcprototype> |
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<funcprototype> |
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<funcdef>sg_cpu_stats *<function>sg_get_cpu_stats_diff</function></funcdef> |
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<void/> |
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</funcprototype> |
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<funcprototype> |
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<funcdef>sg_cpu_percents *<function>sg_get_cpu_percents</function></funcdef> |
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<void/> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_disk_io_stats *<function>sg_get_disk_io_stats</function></funcdef> |
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<paramdef>int *<parameter>entries</parameter></paramdef> |
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</funcprototype> |
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<funcprototype> |
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<funcdef>sg_disk_io_stats *<function>sg_get_disk_io_stats_diff</function></funcdef> |
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<paramdef>int *<parameter>entries</parameter></paramdef> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_fs_stats *<function>sg_get_fs_stats</function></funcdef> |
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<void/> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_host_info *<function>sg_get_host_info</function></funcdef> |
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<void/> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_load_stats *<function>sg_get_load_stats</function></funcdef> |
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<void/> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_mem_stats *<function>sg_get_mem_stats</function></funcdef> |
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<void/> |
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</funcprototype> |
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<funcprototype> |
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<funcdef>sg_swap_stats *<function>sg_get_swap_stats</function></funcdef> |
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<void/> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_network_io_stats *<function>sg_get_network_io_stats</function></funcdef> |
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<paramdef>int *<parameter>entries</parameter></paramdef> |
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</funcprototype> |
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<funcprototype> |
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<funcdef>sg_network_io_stats *<function>sg_get_network_io_stats_diff</function></funcdef> |
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<paramdef>int *<parameter>entries</parameter></paramdef> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_network_iface_stats *<function>sg_get_network_iface_stats</function></funcdef> |
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<paramdef>int *<parameter>entries</parameter></paramdef> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_page_stats *<function>sg_get_page_stats</function></funcdef> |
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<void/> |
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</funcprototype> |
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<funcprototype> |
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<funcdef>sg_page_stats *<function>sg_get_page_stats_diff</function></funcdef> |
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<void/> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_process_count *<function>sg_get_process_stats</function></funcdef> |
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<void/> |
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</funcprototype> |
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|
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<funcprototype> |
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<funcdef>sg_user_stats *<function>sg_get_user_stats</function></funcdef> |
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<void/> |
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</funcprototype> |
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|
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</funcsynopsis> |
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</refsynopsisdiv> |
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|
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<refsect1> |
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<title>Description</title> |
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<para> |
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The statgrab library provides a cross-platform interface to getting |
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system statistics. Each of the function calls returns a structure |
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containing statistics. See the manual page for each individual |
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function for more details on usage. |
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</para> |
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<para> |
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<function>sg_init</function> must be the first |
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function you call before you start to use libstatgrab; it performs all |
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the one-time initialisation operations that need setuid/setgid |
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privileges. For instance, on *BSD it opens a descriptor to be able to |
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read kernel structures later on, and on Solaris it reads the device |
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mappings that in some cases are only accessible by root (machines with |
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a /dev/osa). Once this has run, the other libstatgrab functions no longer |
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need elevated privileges. It is therefore a good idea to call |
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<function>sg_drop_privileges</function>, which discards |
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setuid and setgid privileges, immediately after you call |
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<function>sg_init</function>, unless your application has |
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another reason for needing setuid or setgid privileges. |
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</para> |
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<para> |
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<function>sg_init</function> and |
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<function>sg_drop_privileges</function> return 0 on success, and |
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non-zero on failure. |
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</para> |
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<para> |
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There are three functions relating to error reporting in libstatgrab. |
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The first, <function>sg_get_error</function> returns an sg_error code |
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which relates to the last error generated by libstatgrab. This can be |
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converted to a string by calling <function>sg_str_error</function> |
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giving the sg_error code as an argument. An optional |
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argument may be set when the error was generated. This can be |
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accessed by calling <function>sg_get_error_arg</function>; |
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<constant>NULL</constant> will be returned if no argument has |
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been set. Some errors will also record the value of the system |
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errno variable when the error occurred; this can be retrieved by |
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calling <function>sg_get_error_errno</function>, which will |
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return <constant>0</constant> if no valid errno has been recorded. |
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</para> |
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<para> |
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It is the intended practice that whenever a libstatgrab function is |
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called and subsequently fails that an appropriate error will be set. |
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</para> |
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<para> |
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The library was originally written to support the i-scream |
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central monitoring system, but has since become a standalone |
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package. It has been ported to work on Linux, NetBSD, FreeBSD, |
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OpenBSD, DragonFly BSD, Solaris and Cygwin. |
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</para> |
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</refsect1> |
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|
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<refsect1> |
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<title>See Also</title> |
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|
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<simplelist type="inline"> |
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<member> |
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<citerefentry> |
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<refentrytitle>sg_get_cpu_percents</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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<citerefentry> |
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<refentrytitle>sg_get_disk_io_stats</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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<citerefentry> |
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<refentrytitle>sg_get_fs_stats</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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<citerefentry> |
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<refentrytitle>sg_get_host_info</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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<citerefentry> |
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<refentrytitle>sg_get_load_stats</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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<citerefentry> |
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<refentrytitle>sg_get_mem_stats</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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<citerefentry> |
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<refentrytitle>sg_get_network_io_stats</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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<citerefentry> |
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<refentrytitle>sg_get_network_iface_stats</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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<citerefentry> |
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<refentrytitle>sg_get_page_stats</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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<citerefentry> |
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<refentrytitle>sg_get_process_stats</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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<citerefentry> |
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<refentrytitle>sg_get_user_stats</refentrytitle> |
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<manvolnum>3</manvolnum> |
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</citerefentry> |
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</member> |
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</simplelist> |
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</refsect1> |
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|
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<refsect1> |
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<title>Website</title> |
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|
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<simplelist type="vert"> |
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<member> |
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<ulink url="http://www.i-scream.org/libstatgrab/"> |
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http://www.i-scream.org/libstatgrab/ |
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</ulink> |
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</member> |
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</simplelist> |
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</refsect1> |
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|
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</refentry> |
