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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) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>sched_getscheduler</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="sched_getscheduler"></a> <a name="tag_03_620"></a><!-- sched_getscheduler --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_620_01"></a>NAME</h4><blockquote>sched_getscheduler - get scheduling policy (<b>REALTIME</b>)</blockquote><h4><a name="tag_03_620_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('PS')">PS</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/sched.h.html">sched.h</a>><br><br> int sched_getscheduler(pid_t</tt> <i>pid</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_620_03"></a>DESCRIPTION</h4><blockquote><p>The <i>sched_getscheduler</i>() function shall return the scheduling policy of the process specified by <i>pid</i>. If the valueof <i>pid</i> is negative, the behavior of the <i>sched_getscheduler</i>() function is unspecified.</p><p>The values that can be returned by <i>sched_getscheduler</i>() are defined in the <a href="../basedefs/sched.h.html"><i><sched.h></i></a> header.</p><p>If a process specified by <i>pid</i> exists, and if the calling process has permission, the scheduling policy shall be returnedfor the process whose process ID is equal to <i>pid</i>.</p><p>If <i>pid</i> is zero, the scheduling policy shall be returned for the calling process.</p></blockquote><h4><a name="tag_03_620_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, the <i>sched_getscheduler</i>() function shall return the scheduling policy of the specifiedprocess. If unsuccessful, the function shall return -1 and set <i>errno</i> to indicate the error.</p></blockquote><h4><a name="tag_03_620_05"></a>ERRORS</h4><blockquote><p>The <i>sched_getscheduler</i>() function shall fail if:</p><dl compact><dt>[EPERM]</dt><dd>The requesting process does not have permission to determine the scheduling policy of the specified process.</dd><dt>[ESRCH]</dt><dd>No process can be found corresponding to that 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_620_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_620_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_620_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_620_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_620_10"></a>SEE ALSO</h4><blockquote><p><a href="sched_getparam.html"><i>sched_getparam</i>()</a>, <a href="sched_setparam.html"><i>sched_setparam</i>()</a>, <a href="sched_setscheduler.html"><i>sched_setscheduler</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/sched.h.html"><i><sched.h></i></a></p></blockquote><h4><a name="tag_03_620_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 5. Included for alignment with the POSIX Realtime Extension.</p></blockquote><h4><a name="tag_03_620_12"></a>Issue 6</h4><blockquote><p>The <i>sched_getscheduler</i>() function is marked as part of the Process Scheduling option.</p><p>The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the ProcessScheduling option.</p></blockquote><div class="box"><em>End of informative text.</em></div><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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