sched_getscheduler.html

来自「unix 下的C开发手册,还用详细的例程。」· HTML 代码 · 共 99 行

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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>sched_getscheduler</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_008_198">&nbsp;</a>NAME</h4><blockquote>sched_getscheduler - get scheduling policy(<b>REALTIME</b>)</blockquote><h4><a name = "tag_000_008_199">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="sched.h.html">sched.h</a>&gt;int sched_getscheduler(pid_t <i>pid</i>);</code></pre></blockquote><h4><a name = "tag_000_008_200">&nbsp;</a>DESCRIPTION</h4><blockquote>The<i>sched_getscheduler()</i>function returns the scheduling policy of the process specified by<i>pid</i>.If the value of<i>pid</i>is negative, the behaviour of the<i>sched_getscheduler()</i>function is unspecified.<p>The values that can be returned by<i>sched_getscheduler()</i>are defined in the header file<i><a href="sched.h.html">&lt;sched.h&gt;</a></i><p>If a process specified by<i>pid</i>exists and if the calling process has permission,the scheduling policy will be returnedfor the process whose process ID is equal to<i>pid</i>.<p>If<i>pid</i>is zero, the scheduling policy will be returned for the calling process.</blockquote><h4><a name = "tag_000_008_201">&nbsp;</a>RETURN VALUE</h4><blockquote>Upon successful completion, the<i>sched_getscheduler()</i>function returns the scheduling policy of the specified process.If unsuccessful, the function returns -1 and sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_008_202">&nbsp;</a>ERRORS</h4><blockquote>The <i>sched_getscheduler()</i>function will fail if:<dl compact><dt>[ENOSYS]<dd>The function<i>sched_getscheduler()</i>is not supported by this implementation.<dt>[EPERM]<dd>The requesting process does not have permissionto determine the scheduling policy of the specified process.<dt>[ESRCH]<dd>No process can be found corresponding to that specified by<i>pid</i>.</dl></blockquote><h4><a name = "tag_000_008_203">&nbsp;</a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_204">&nbsp;</a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_205">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_206">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="sched_getparam.html">sched_getparam()</a></i>,<i><a href="sched_setparam.html">sched_setparam()</a></i>,<i><a href="sched_setscheduler.html">sched_setscheduler()</a></i>,<i><a href="sched.h.html">&lt;sched.h&gt;</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 &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 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>

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