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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) 2001-2003 The Open Group, All Rights Reserved --><title>tcsetpgrp</title></head><body bgcolor="white"><basefont size="3"> <a name="tcsetpgrp"></a> <a name="tag_03_769"></a><!-- tcsetpgrp --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_769_01"></a>NAME</h4><blockquote>tcsetpgrp - set the foreground process group ID</blockquote><h4><a name="tag_03_769_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/unistd.h.html">unistd.h</a>><br><br> int tcsetpgrp(int</tt> <i>fildes</i><tt>, pid_t</tt> <i>pgid_id</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_769_03"></a>DESCRIPTION</h4><blockquote><p>If the process has a controlling terminal, <i>tcsetpgrp</i>() shall set the foreground process group ID associated with theterminal to <i>pgid_id</i>. The application shall ensure that the file associated with <i>fildes</i> is the controlling terminal ofthe calling process and the controlling terminal is currently associated with the session of the calling process. The applicationshall ensure that the value of <i>pgid_id</i> matches a process group ID of a process in the same session as the callingprocess.</p><p>Attempts to use <i>tcsetpgrp</i>() from a process which is a member of a background process group on a <i>fildes</i> associatedwith its controlling terminal shall cause the process group to be sent a SIGTTOU signal. If the calling process is blocking orignoring SIGTTOU signals, the process shall be allowed to perform the operation, and no signal is sent.</p></blockquote><h4><a name="tag_03_769_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and <i>errno</i> set to indicate the error.</p></blockquote><h4><a name="tag_03_769_05"></a>ERRORS</h4><blockquote><p>The <i>tcsetpgrp</i>() function shall fail if:</p><dl compact><dt>[EBADF]</dt><dd>The <i>fildes</i> argument is not a valid file descriptor.</dd><dt>[EINVAL]</dt><dd>This implementation does not support the value in the <i>pgid_id</i> argument.</dd><dt>[ENOTTY]</dt><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 the calling process.</dd><dt>[EPERM]</dt><dd>The value of <i>pgid_id</i> is a value supported by the implementation, but does not match the process group ID of a process inthe same session as the calling process.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_769_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_769_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_769_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_769_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_769_10"></a>SEE ALSO</h4><blockquote><p><a href="tcgetpgrp.html"><i>tcgetpgrp</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a>, <a href="../basedefs/unistd.h.html"><i><unistd.h></i></a></p></blockquote><h4><a name="tag_03_769_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 3. Included for alignment with the POSIX.1-1988 standard.</p></blockquote><h4><a name="tag_03_769_12"></a>Issue 6</h4><blockquote><p>In the SYNOPSIS, the inclusion of <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> is no longerrequired.</p><p>The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p><ul><li><p>The requirement to include <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> has been removed. Although <ahref="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> was required for conforming implementations of previous POSIXspecifications, it was not required for UNIX applications.</p></li><li><p>In the DESCRIPTION and ERRORS sections, text previously conditional on _POSIX_JOB_CONTROL is now mandated. This is a FIPSrequirement.</p></li></ul><p>The DESCRIPTION is updated to avoid use of the term "must" for application requirements.</p><p>The Open Group Corrigendum U047/4 is applied.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><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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