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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>setsid</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_008_492"> </a>NAME</h4><blockquote>setsid - create session and set process group ID</blockquote><h4><a name = "tag_000_008_493"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="systypes.h.html">sys/types.h</a>>#include <<a href="unistd.h.html">unistd.h</a>>pid_t setsid(void);</code></pre></blockquote><h4><a name = "tag_000_008_494"> </a>DESCRIPTION</h4><blockquote>The<i>setsid()</i>function creates a new session, if the calling processis not a process group leader.Upon return the calling process will be the session leader ofthis new session, will be the process group leader of a newprocess group, and will have no controlling terminal.The process group ID of the calling process will be set equal tothe process ID of the calling process.The calling process will be the only process in the new processgroup and the only process in the new session.</blockquote><h4><a name = "tag_000_008_495"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>setsid()</i>returns the value of the process group ID of the calling process.Otherwise it returns (<b>pid_t</b>)-1 and sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_008_496"> </a>ERRORS</h4><blockquote>The<i>setsid()</i>function will fail if:<dl compact><dt>[EPERM]<dd>The calling process is already a process group leader, or theprocess group ID of a process other than the calling processmatches the process ID of the calling process.</dl></blockquote><h4><a name = "tag_000_008_497"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_498"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_499"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_500"> </a>SEE ALSO</h4><blockquote><i><a href="getsid.html">getsid()</a></i>,<i><a href="setpgid.html">setpgid()</a></i>,<i><a href="setpgrp.html">setpgrp()</a></i>,<i><a href="systypes.h.html"><sys/types.h></a></i>,<i><a href="unistd.h.html"><unistd.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX.1-1988 standard.</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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