📄 clock_getcpuclockid.html
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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>clock_getcpuclockid</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="clock_getcpuclockid"></a> <a name="tag_03_75"></a><!-- clock_getcpuclockid --> <!--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_03_75_01"></a>NAME</h4><blockquote>clock_getcpuclockid - access a process CPU-time clock (<b>ADVANCED REALTIME</b>)</blockquote><h4><a name="tag_03_75_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('CPT')">CPT</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/time.h.html">time.h</a>><br><br> int clock_getcpuclockid(pid_t</tt> <i>pid</i><tt>, clockid_t *</tt><i>clock_id</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_75_03"></a>DESCRIPTION</h4><blockquote><p>The <i>clock_getcpuclockid</i>() function shall return the clock ID of the CPU-time clock of the process specified by<i>pid</i>. If the process described by <i>pid</i> exists and the calling process has permission, the clock ID of this clock shallbe returned in <i>clock_id</i>.</p><p>If <i>pid</i> is zero, the <i>clock_getcpuclockid</i>() function shall return the clock ID of the CPU-time clock of the processmaking the call, in <i>clock_id</i>.</p><p>The conditions under which one process has permission to obtain the CPU-time clock ID of other processes areimplementation-defined.</p></blockquote><h4><a name="tag_03_75_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>clock_getcpuclockid</i>() shall return zero; otherwise, an error number shall be returned toindicate the error.</p></blockquote><h4><a name="tag_03_75_05"></a>ERRORS</h4><blockquote><p>The <i>clock_getcpuclockid</i>() function shall fail if:</p><dl compact><dt>[EPERM]</dt><dd>The requesting process does not have permission to access the CPU-time clock for the process.</dd></dl><p>The <i>clock_getcpuclockid</i>() function may fail if:</p><dl compact><dt>[ESRCH]</dt><dd>No process can be found corresponding to the process specified by <i>pid</i>.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_75_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_75_07"></a>APPLICATION USAGE</h4><blockquote><p>The <i>clock_getcpuclockid</i>() function is part of the Process CPU-Time Clocks option and need not be provided on allimplementations.</p></blockquote><h4><a name="tag_03_75_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_75_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_75_10"></a>SEE ALSO</h4><blockquote><p><a href="clock_getres.html"><i>clock_getres</i>()</a> , <a href="timer_create.html"><i>timer_create</i>()</a> , the BaseDefinitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/time.h.html"><i><time.h></i></a></p></blockquote><h4><a name="tag_03_75_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Derived from IEEE Std 1003.1d-1999.</p><p>In the SYNOPSIS, the inclusion of <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> is no longerrequired.</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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