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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>tcsetpgrp</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_009_507"> </a>NAME</h4><blockquote>tcsetpgrp - set the foreground process group ID</blockquote><h4><a name = "tag_000_009_508"> </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>>int tcsetpgrp(int <i>fildes</i>, pid_t <i>pgid_id</i>);</code></pre></blockquote><h4><a name = "tag_000_009_509"> </a>DESCRIPTION</h4><blockquote>If the process has a controlling terminal,<i>tcsetpgrp()</i>will set the foreground process group ID associated with the terminal to<i>pgid_id</i>.The file associated with<i>fildes</i>must be the controlling terminal of the calling process and thecontrolling terminal must be currently associated with thesession of the calling process.The value of<i>pgid_id</i>must match a process group ID of a process in the same session asthe calling process.<p>Attempts to use <i>tcsetpgrp()</i> from a process which is a member of abackground process group on a fildes associated with its controllingterminal will cause the process group to be sent a SIGTTOU signal.If the calling process is blocking or ignoring SIGTTOU signals, theprocess is allowed to perform the operation, and no signal is sent.</blockquote><h4><a name = "tag_000_009_510"> </a>RETURN VALUE</h4><blockquote>Upon successful completion, 0 is returned. Otherwise, -1 is returned and<i>errno</i>is set to indicate the error.</blockquote><h4><a name = "tag_000_009_511"> </a>ERRORS</h4><blockquote>The<i>tcsetpgrp()</i>function will fail if:<dl compact><dt>[EBADF]<dd>The<i>fildes</i>argument is not a valid file descriptor.<dt>[EINVAL]<dd>This implementation does not support the value in the<i>pgid_id</i>argument.<dt>[ENOTTY]<dd>The calling process does not have a controlling terminal,or the file is not the controlling terminal, or the controllingterminal is no longer associated with the session of thecalling process.<dt>[EPERM]<dd>The value of<i>pgid_id</i>does not match the process group ID of a processin the same session as the calling process.</dl></blockquote><h4><a name = "tag_000_009_512"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_513"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_514"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_515"> </a>SEE ALSO</h4><blockquote><i><a href="tcgetpgrp.html">tcgetpgrp()</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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