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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>times</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_010_070"> </a>NAME</h4><blockquote>times - get process and waited-for child process times</blockquote><h4><a name = "tag_000_010_071"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="systimes.h.html">sys/times.h</a>>clock_t times(struct tms *<i>buffer</i>);</code></pre></blockquote><h4><a name = "tag_000_010_072"> </a>DESCRIPTION</h4><blockquote>The<i>times()</i>function fills the<b>tms</b>structure pointed to by<i>buffer</i>with time-accounting information.The structure<b>tms</b>is defined in<i><a href="systimes.h.html"><sys/times.h></a></i>.<p>All times are measured in terms of the number of clock ticks used.<p>The times of a terminated child process are included in the<b>tms_cutime</b>and<b>tms_cstime</b>elements of the parent when<i><a href="wait.html">wait()</a></i>or<i><a href="waitpid.html">waitpid()</a></i>returns the process ID of this terminated child. If a child process has notwaited for its children, their times will not be included in its times.<ul><p><li>The<b>tms_utime</b>structure member is the CPUtime charged for the execution of user instructions of thecalling process.<p><li>The<b>tms_stime</b>structure member is the CPUtime charged for execution by the system on behalf of thecalling process.<p><li>The<b>tms_cutime</b>structure member is the sum of the<b>tms_utime</b>and<b>tms_cutime</b>times of the child processes.<p><li>The<b>tms_cstime</b>structure member is the sum of the<b>tms_stime</b>and<b>tms_cstime</b>times of the child processes.<p></ul></blockquote><h4><a name = "tag_000_010_073"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>times()</i>returns the elapsed real time, inclock ticks, since an arbitrarypoint in the past (for example, system start-up time).This point does not change from one invocation of<i>times()</i>within the process to another. The return value may overflow the possiblerange of type<b>clock_t</b>.If<i>times()</i>fails, (<b>clock_t</b>)-1 is returned and<i>errno</i>is set to indicate the error.</blockquote><h4><a name = "tag_000_010_074"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_010_075"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_076"> </a>APPLICATION USAGE</h4><blockquote>Applications should useto determine the number of clock ticks persecond as it may vary from system to system.</blockquote><h4><a name = "tag_000_010_077"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_078"> </a>SEE ALSO</h4><blockquote><i><a href="exec.html">exec</a></i>,<i><a href="fork.html">fork()</a></i>,<i><a href="sysconf.html">sysconf()</a></i>,<i><a href="time.html">time()</a></i>,<i><a href="wait.html">wait()</a></i>,<i><a href="systimes.h.html"><sys/times.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</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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