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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>setgid</title></head><body bgcolor="white"><basefont size="3"> <a name="setgid"></a> <a name="tag_03_649"></a><!-- setgid --> <!--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_649_01"></a>NAME</h4><blockquote>setgid - set-group-ID</blockquote><h4><a name="tag_03_649_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/unistd.h.html">unistd.h</a>><br><br> int setgid(gid_t</tt> <i>gid</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_649_03"></a>DESCRIPTION</h4><blockquote><p>If the process has appropriate privileges, <i>setgid</i>() shall set the real group ID, effective group ID, and the savedset-group-ID of the calling process to <i>gid</i>.</p><p>If the process does not have appropriate privileges, but <i>gid</i> is equal to the real group ID or the saved set-group-ID,<i>setgid</i>() shall set the effective group ID to <i>gid</i>; the real group ID and saved set-group-ID shall remainunchanged.</p><p>The <i>setgid</i>() function shall not affect the supplementary group list in any way.</p><p>Any supplementary group IDs of the calling process shall remain unchanged.</p></blockquote><h4><a name="tag_03_649_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, 0 is returned. Otherwise, -1 shall be returned and <i>errno</i> set to indicate the error.</p></blockquote><h4><a name="tag_03_649_05"></a>ERRORS</h4><blockquote><p>The <i>setgid</i>() function shall fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The value of the <i>gid</i> argument is invalid and is not supported by the implementation.</dd><dt>[EPERM]</dt><dd>The process does not have appropriate privileges and <i>gid</i> does not match the real group ID or the savedset-group-ID.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_649_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_649_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_649_08"></a>RATIONALE</h4><blockquote><p>Refer to the RATIONALE section in <a href="setuid.html"><i>setuid</i>()</a> .</p></blockquote><h4><a name="tag_03_649_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_649_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="setregid.html"><i>setregid</i>()</a> , <a href="setreuid.html"><i>setreuid</i>()</a> , <a href="setuid.html"><i>setuid</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_649_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1. Derived from Issue 1 of the SVID.</p></blockquote><h4><a name="tag_03_649_12"></a>Issue 6</h4><blockquote><p>In the SYNOPSIS, the optional include of the <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> header isremoved.</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>Functionality associated with _POSIX_SAVED_IDS is now mandated. This is a FIPS requirement.</p></li></ul><p>The following changes were made to align with the IEEE P1003.1a draft standard:</p><ul><li><p>The effects of <i>setgid</i>() in processes without appropriate privileges are changed.</p></li><li><p>A requirement that the supplementary group list is not affected is added.</p></li></ul></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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