164 lines
5.4 KiB
HTML
164 lines
5.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>setgid</title>
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<body bgcolor="white">
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<basefont size="3"> <a name="setgid"></a> <a name="tag_03_649"></a><!-- setgid -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_649_01"></a>NAME</h4>
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<blockquote>setgid - set-group-ID</blockquote>
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<h4><a name="tag_03_649_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/unistd.h.html">unistd.h</a>><br>
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<br>
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int setgid(gid_t</tt> <i>gid</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_649_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>If the process has appropriate privileges, <i>setgid</i>() shall set the real group ID, effective group ID, and the saved
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set-group-ID of the calling process to <i>gid</i>.</p>
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<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,
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<i>setgid</i>() shall set the effective group ID to <i>gid</i>; the real group ID and saved set-group-ID shall remain
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unchanged.</p>
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<p>The <i>setgid</i>() function shall not affect the supplementary group list in any way.</p>
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<p>Any supplementary group IDs of the calling process shall remain unchanged.</p>
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</blockquote>
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<h4><a name="tag_03_649_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, 0 is returned. Otherwise, -1 shall be returned and <i>errno</i> set to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_649_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>setgid</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The value of the <i>gid</i> argument is invalid and is not supported by the implementation.</dd>
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<dt>[EPERM]</dt>
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<dd>The process does not have appropriate privileges and <i>gid</i> does not match the real group ID or the saved
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set-group-ID.</dd>
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</dl>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_649_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_649_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_649_08"></a>RATIONALE</h4>
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<blockquote>
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<p>Refer to the RATIONALE section in <a href="setuid.html"><i>setuid</i>()</a> .</p>
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</blockquote>
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<h4><a name="tag_03_649_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_649_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="exec.html"><i><a href="../functions/exec.html">exec</a></i>()</a> , <a href="getegid.html"><i>getegid</i>()</a> , <a
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href="geteuid.html"><i>geteuid</i>()</a> , <a href="getgid.html"><i>getgid</i>()</a> , <a href="getuid.html"><i>getuid</i>()</a> ,
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<a href="setegid.html"><i>setegid</i>()</a> , <a href="seteuid.html"><i>seteuid</i>()</a> , <a href=
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"setregid.html"><i>setregid</i>()</a> , <a href="setreuid.html"><i>setreuid</i>()</a> , <a href="setuid.html"><i>setuid</i>()</a> ,
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the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/sys/types.h.html"><i><sys/types.h></i></a>, <a href="../basedefs/unistd.h.html"><i><unistd.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_649_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
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</blockquote>
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<h4><a name="tag_03_649_12"></a>Issue 6</h4>
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<blockquote>
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<p>In the SYNOPSIS, the optional include of the <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> header is
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removed.</p>
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<p>The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p>
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<ul>
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<li>
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<p>The requirement to include <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> has been removed. Although <a
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href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> was required for conforming implementations of previous POSIX
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specifications, it was not required for UNIX applications.</p>
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</li>
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<li>
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<p>Functionality associated with _POSIX_SAVED_IDS is now mandated. This is a FIPS requirement.</p>
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</li>
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</ul>
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<p>The following changes were made to align with the IEEE P1003.1a draft standard:</p>
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<ul>
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<li>
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<p>The effects of <i>setgid</i>() in processes without appropriate privileges are changed.</p>
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</li>
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<li>
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<p>A requirement that the supplementary group list is not affected is added.</p>
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</li>
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</ul>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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