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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>nanosleep</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_007_859"> </a>NAME</h4><blockquote>nanosleep - high resolution sleep(<b>REALTIME</b>)</blockquote><h4><a name = "tag_000_007_860"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="time.h.html">time.h</a>>int nanosleep(const struct timespec *<i>rqtp</i>, struct timespec *<i>rmtp</i>);</code></pre></blockquote><h4><a name = "tag_000_007_861"> </a>DESCRIPTION</h4><blockquote>The<i>nanosleep()</i>function causes the current thread to be suspended from executionuntil either the time interval specified by the<i>rqtp</i>argument has elapsedor a signal is delivered to the calling threadand its action is to invoke a signal-catching functionor to terminate the process.The suspension time may be longer than requestedbecause the argument value is rounded up to an integer multiple ofthe sleep resolution orbecause of thescheduling of other activity by the system.But, except for the case of being interrupted by a signal, thesuspension time will not be less than the time specified by<i>rqtp</i>,as measured by the system clock, CLOCK_REALTIME.<p>The use of the<i>nanosleep()</i>function has no effect on the action or blockage of any signal.</blockquote><h4><a name = "tag_000_007_862"> </a>RETURN VALUE</h4><blockquote>If the<i>nanosleep()</i>function returns because the requested time has elapsed,its return value is zero.<p>If the<i>nanosleep()</i>function returns because it has been interrupted by a signal,the function returns a value of -1 and sets<i>errno</i>to indicate the interruption.If the<i>rmtp</i>argument is non-NULL, the<b>timespec</b>structure referenced by itis updated to contain the amount of time remaining in the interval(the requested time minus the time actually slept).If the<i>rmtp</i>argument is NULL, the remaining time is not returned.<p>If<i>nanosleep()</i>fails, it returns a value of -1 and sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_007_863"> </a>ERRORS</h4><blockquote>The <i>nanosleep()</i>function will fail if:<dl compact><dt>[EINTR]<dd>The<i>nanosleep()</i>function was interrupted by a signal.<dt>[EINVAL]<dd>The<i>rqtp</i>argument specified a nanosecondvalue less than zero or greater than or equal to 1000 million.<dt>[ENOSYS]<dd>The<i>nanosleep()</i>function is not supported by this implementation.</dl></blockquote><h4><a name = "tag_000_007_864"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_865"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_866"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_867"> </a>SEE ALSO</h4><blockquote><i><a href="sleep.html">sleep()</a></i>,<i><a href="time.h.html"><time.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995)</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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