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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>setregid</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="setregid"></a> <a name="tag_03_663"></a><!-- setregid --> <!--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_663_01"></a>NAME</h4><blockquote>setregid - set real and effective group IDs</blockquote><h4><a name="tag_03_663_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/unistd.h.html">unistd.h</a>><br><br> int setregid(gid_t</tt> <i>rgid</i><tt>, gid_t</tt> <i>egid</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_663_03"></a>DESCRIPTION</h4><blockquote><p>The <i>setregid</i>() function shall set the real and effective group IDs of the calling process.</p><p>If <i>rgid</i> is -1, the real group ID shall not be changed; if <i>egid</i> is -1, the effective group ID shall not bechanged.</p><p>The real and effective group IDs may be set to different values in the same call.</p><p>Only a process with appropriate privileges can set the real group ID and the effective group ID to any valid value.</p><p>A non-privileged process can set either the real group ID to the saved set-group-ID from one of the <i><a href="../functions/exec.html">exec</a></i> family of functions, or the effective group ID to the saved set-group-ID or the real groupID.</p><p>Any supplementary group IDs of the calling process remain unchanged.</p></blockquote><h4><a name="tag_03_663_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, andneither of the group IDs are changed.</p></blockquote><h4><a name="tag_03_663_05"></a>ERRORS</h4><blockquote><p>The <i>setregid</i>() function shall fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The value of the <i>rgid</i> or <i>egid</i> argument is invalid or out-of-range.</dd><dt>[EPERM]</dt><dd>The process does not have appropriate privileges and a change other than changing the real group ID to the saved set-group-ID,or changing the effective group ID to the real group ID or the saved set-group-ID, was requested.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_663_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_663_07"></a>APPLICATION USAGE</h4><blockquote><p>If a set-group-ID process sets its effective group ID to its real group ID, it can still set its effective group ID back to thesaved set-group-ID.</p></blockquote><h4><a name="tag_03_663_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_663_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_663_10"></a>SEE ALSO</h4><blockquote><p><a href="exec.html"><i><a href="../functions/exec.html">exec</a></i>()</a>, <a href="getegid.html"><i>getegid</i>()</a>, <ahref="geteuid.html"><i>geteuid</i>()</a>, <a href="getgid.html"><i>getgid</i>()</a>, <a href="getuid.html"><i>getuid</i>()</a>,<a href="setegid.html"><i>setegid</i>()</a>, <a href="seteuid.html"><i>seteuid</i>()</a>, <a href="setgid.html"><i>setgid</i>()</a>, <a href="setreuid.html"><i>setreuid</i>()</a>, <a href="setuid.html"><i>setuid</i>()</a>, theBase Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/unistd.h.html"><i><unistd.h></i></a></p></blockquote><h4><a name="tag_03_663_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4, Version 2.</p></blockquote><h4><a name="tag_03_663_12"></a>Issue 5</h4><blockquote><p>Moved from X/OPEN UNIX extension to BASE.</p><p>The DESCRIPTION is updated to indicate that the saved set-group-ID can be set by any of the <i><a href="../functions/exec.html">exec</a></i> family of functions, not just <a href="../functions/execve.html"><i>execve</i>()</a>.</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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