141 lines
4.7 KiB
HTML
141 lines
4.7 KiB
HTML
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<title>sched_getscheduler</title>
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<basefont size="3"> <a name="sched_getscheduler"></a> <a name="tag_03_620"></a><!-- sched_getscheduler -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_620_01"></a>NAME</h4>
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<blockquote>sched_getscheduler - get scheduling policy (<b>REALTIME</b>)</blockquote>
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<h4><a name="tag_03_620_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('PS')">PS</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/sched.h.html">sched.h</a>><br>
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<br>
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int sched_getscheduler(pid_t</tt> <i>pid</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_620_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>sched_getscheduler</i>() function shall return the scheduling policy of the process specified by <i>pid</i>. If the value
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of <i>pid</i> is negative, the behavior of the <i>sched_getscheduler</i>() function is unspecified.</p>
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<p>The values that can be returned by <i>sched_getscheduler</i>() are defined in the <a href=
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"../basedefs/sched.h.html"><i><sched.h></i></a> header.</p>
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<p>If a process specified by <i>pid</i> exists, and if the calling process has permission, the scheduling policy shall be returned
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for the process whose process ID is equal to <i>pid</i>.</p>
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<p>If <i>pid</i> is zero, the scheduling policy shall be returned for the calling process.</p>
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</blockquote>
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<h4><a name="tag_03_620_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, the <i>sched_getscheduler</i>() function shall return the scheduling policy of the specified
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process. If unsuccessful, the function shall return -1 and set <i>errno</i> to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_620_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>sched_getscheduler</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EPERM]</dt>
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<dd>The requesting process does not have permission to determine the scheduling policy of the specified process.</dd>
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<dt>[ESRCH]</dt>
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<dd>No process can be found corresponding to that specified by <i>pid</i>.</dd>
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</dl>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_620_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_620_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_620_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_620_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_620_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="sched_getparam.html"><i>sched_getparam</i>()</a> , <a href="sched_setparam.html"><i>sched_setparam</i>()</a> , <a href=
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"sched_setscheduler.html"><i>sched_setscheduler</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/sched.h.html"><i><sched.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_620_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 5. Included for alignment with the POSIX Realtime Extension.</p>
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</blockquote>
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<h4><a name="tag_03_620_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>sched_getscheduler</i>() function is marked as part of the Process Scheduling option.</p>
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<p>The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the Process
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Scheduling option.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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POSIX ® is a registered Trademark of The IEEE.<br>
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