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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title><sys/resource.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../../jscript/dotcode.js"></script><basefont size="3"> <a name="<sys/resource.h>"></a> <a name="tag_13_57"></a><!-- <sys/resource.h> --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_13_57_01"></a>NAME</h4><blockquote>sys/resource.h - definitions for XSI resource operations</blockquote><h4><a name="tag_13_57_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../../images/opt-start.gif" alt="[Option Start]" border="0"> #include <sys/resource.h> <img src="../../images/opt-end.gif" alt="[Option End]" border="0"></tt></div></blockquote><h4><a name="tag_13_57_03"></a>DESCRIPTION</h4><blockquote><p>The <i><sys/resource.h></i> header shall define the following symbolic constants as possible values of the <i>which</i>argument of <a href="../../functions/getpriority.html"><i>getpriority</i>()</a> and <a href="../../functions/setpriority.html"><i>setpriority</i>()</a>:</p><dl compact><dt>PRIO_PROCESS</dt><dd>Identifies the <i>who</i> argument as a process ID.</dd><dt>PRIO_PGRP</dt><dd>Identifies the <i>who</i> argument as a process group ID.</dd><dt>PRIO_USER</dt><dd>Identifies the <i>who</i> argument as a user ID.</dd></dl><p>The following type shall be defined through <b>typedef</b>:</p><dl compact><dt><b>rlim_t</b></dt><dd>Unsigned integer type used for limit values.</dd></dl><p>The following symbolic constants shall be defined:</p><dl compact><dt>RLIM_INFINITY</dt><dd>A value of <b>rlim_t</b> indicating no limit.</dd><dt>RLIM_SAVED_MAX</dt><dd>A value of type <b>rlim_t</b> indicating an unrepresentable saved hard limit.</dd><dt>RLIM_SAVED_CUR</dt><dd>A value of type <b>rlim_t</b> indicating an unrepresentable saved soft limit.</dd></dl><p>On implementations where all resource limits are representable in an object of type <b>rlim_t</b>, RLIM_SAVED_MAX andRLIM_SAVED_CUR need not be distinct from RLIM_INFINITY.</p><p>The following symbolic constants shall be defined as possible values of the <i>who</i> parameter of <a href="../../functions/getrusage.html"><i>getrusage</i>()</a>:</p><dl compact><dt>RUSAGE_SELF</dt><dd>Returns information about the current process.</dd><dt>RUSAGE_CHILDREN</dt><dd>Returns information about children of the current process.</dd></dl><p>The <i><sys/resource.h></i> header shall define the <b>rlimit</b> structure that includes at least the followingmembers:</p><pre><tt>rlim_t rlim_cur </tt> The current (soft) limit. <tt>rlim_t rlim_max </tt> The hard limit. <tt></tt></pre><p>The <i><sys/resource.h></i> header shall define the <b>rusage</b> structure that includes at least the followingmembers:</p><pre><tt>struct timeval ru_utime </tt> User time used. <tt>struct timeval ru_stime </tt> System time used. <tt></tt></pre><p>The <b>timeval</b> structure shall be defined as described in <a href="../sys/time.h.html#tag_13_64"><i><sys/time.h></i></a> .</p><p>The following symbolic constants shall be defined as possible values for the <i>resource</i> argument of <a href="../../functions/getrlimit.html"><i>getrlimit</i>()</a> and <a href="../../functions/setrlimit.html"><i>setrlimit</i>()</a>:</p><dl compact><dt>RLIMIT_CORE</dt><dd>Limit on size of <b>core</b> file.</dd><dt>RLIMIT_CPU</dt><dd>Limit on CPU time per process.</dd><dt>RLIMIT_DATA</dt><dd>Limit on data segment size.</dd><dt>RLIMIT_FSIZE</dt><dd>Limit on file size.</dd><dt>RLIMIT_NOFILE</dt><dd>Limit on number of open files.</dd><dt>RLIMIT_STACK</dt><dd>Limit on stack size.</dd><dt>RLIMIT_AS</dt><dd>Limit on address space size.</dd></dl><p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p><pre><tt>int getpriority(int, id_t);int getrlimit(int, struct rlimit *);int getrusage(int, struct rusage *);int setpriority(int, id_t, int);int setrlimit(int, const struct rlimit *);</tt></pre><p>The <b>id_t</b> type shall be defined through <b>typedef</b> as described in <a href="../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> .</p><p>Inclusion of the <i><sys/resource.h></i> header may also make visible all symbols from <a href="../../basedefs/sys/time.h.html"><i><sys/time.h></i></a>.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_13_57_04"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_57_05"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_57_06"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_57_07"></a>SEE ALSO</h4><blockquote><p><a href="../sys/time.h.html#tag_13_64"><i><sys/time.h></i></a> , <a href="../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> , the System Interfaces volume of IEEE Std 1003.1-2001, <ahref="../../functions/getpriority.html"><i>getpriority</i>()</a>, <a href="../../functions/getrusage.html"><i>getrusage</i>()</a>,<a href="../../functions/getrlimit.html"><i>getrlimit</i>()</a></p></blockquote><h4><a name="tag_13_57_08"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4, Version 2.</p></blockquote><h4><a name="tag_13_57_09"></a>Issue 5</h4><blockquote><p>Large File System extensions are added.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../../mindex.html">Main Index</a> | <a href="../../basedefs/contents.html">XBD</a> | <a href="../../utilities/contents.html">XCU</a> | <a href="../../functions/contents.html">XSH</a> | <a href="../../xrat/contents.html">XRAT</a> ]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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