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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title><sys/resource.h></title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_009_330"> </a>NAME</h4><blockquote>sys/resource.h - definitions for XSI resource operations</blockquote><h4><a name = "tag_000_009_331"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <sys/resource.h></code></pre></blockquote><h4><a name = "tag_000_009_332"> </a>DESCRIPTION</h4><blockquote>The<i><sys/resource.h></i>header defines the following symbolic constants aspossible values of the <i>which</i> argument of<i><a href="getpriority.html">getpriority()</a></i>and<i><a href="setpriority.html">setpriority()</a></i>:<dl compact><dt>PRIO_PROCESS<dd>Identifies <i>who</i> argument as a process ID.<dt>PRIO_PGRP<dd>Identifies <i>who</i> argument as a process group ID.<dt>PRIO_USER<dd>Identifies <i>who</i> argument as a user ID.</dl><p>The following type is defined through<b>typedef</b>:<dl compact><dt><b>rlim_t</b><dd>Unsigned integral type used for limit values.</dl><p>The following symbolic constants are defined:<dl compact><dt>RLIM_INFINITY<dd>A value of <b>rlim_t</b> indicating no limit.<dt>RLIM_SAVED_MAX<dd>A value of type <b>rlim_t</b> indicating an unrepresentable saved hard limit.<dt>RLIM_SAVED_CUR<dd>A value of type <b>rlim_t</b> indicating an unrepresentable saved soft limit.</dl><p>On implementations where all resource limits are representable in anobject of type<b>rlim_t</b>,RLIM_SAVED_MAX and RLIM_SAVED_CUR need not bedistinct from RLIM_INFINITY. <p>The following symbolic constants are defined as possible valuesof the <i>who</i> parameter of<i><a href="getrusage.html">getrusage()</a></i>:<dl compact><dt>RUSAGE_SELF<dd>Returns information about the current process.<dt>RUSAGE_CHILDREN<dd>Returns information about children of the current process.</dl><p>The<i><sys/resource.h></i>header defines the<b>rlimit</b>structure that includes at least the following members:<pre><code>rlim_t rlim_cur the current (soft) limitrlim_t rlim_max the hard limit</code></pre><p>The<i><sys/resource.h></i>header defines the<b>rusage</b>structure that includes at least the following members:<pre><code>struct timeval ru_utime user time usedstruct timeval ru_stime system time used</code></pre><p>The <b>timeval</b> structure is defined as described in <<b>sys/time.h</b>>.<p>The following symbolic constants are defined as possible values forthe <i>resource</i> argument of<i><a href="getrlimit.html">getrlimit()</a></i>and<i><a href="setrlimit.html">setrlimit()</a></i>:<dl compact><dt>RLIMIT_CORE<dd>Limit on size of core dump file.<dt>RLIMIT_CPU<dd>Limit on CPU time per process.<dt>RLIMIT_DATA<dd>Limit on data segment size.<dt>RLIMIT_FSIZE<dd>Limit on file size.<dt>RLIMIT_NOFILE<dd>Limit on number of open files.<dt>RLIMIT_STACK<dd>Limit on stack size.<dt>RLIMIT_AS<dd>Limit on address space size.</dl><p>The following are declared as functions and may also be defined as macros.Function prototypes must be provided for use with an ISO Ccompiler.<pre><code>int <a href="getpriority.html">getpriority</a>(int, id_t);int <a href="getrlimit.html">getrlimit</a>(int, struct rlimit *);int <a href="getrusage.html">getrusage</a>(int, struct rusage *);int <a href="setpriority.html">setpriority</a>(int, id_t, int);int <a href="setrlimit.html">setrlimit</a>(int, const struct rlimit *);</code></pre><p>The<b>id_t</b>type is defined through<b>typedef</b>as described in<i><a href="systypes.h.html"><sys/types.h></a></i>.<p>Inclusion of the<i><sys/resource.h></i>header may also make visible all symbols from<i><a href="systime.h.html"><sys/time.h></a></i>.</blockquote><h4><a name = "tag_000_009_333"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_334"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_335"> </a>SEE ALSO</h4><blockquote><i><a href="getpriority.html">getpriority()</a></i>,<i><a href="getrusage.html">getrusage()</a></i>,<i><a href="getrlimit.html">getrlimit()</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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