140 lines
4.3 KiB
HTML
140 lines
4.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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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>getuid</title>
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</head>
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<body bgcolor="white">
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<basefont size="3"> <a name="getuid"></a> <a name="tag_03_255"></a><!-- getuid -->
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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_255_01"></a>NAME</h4>
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<blockquote>getuid - get a real user ID</blockquote>
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<h4><a name="tag_03_255_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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uid_t getuid(void);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_255_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>getuid</i>() function shall return the real user ID of the calling process.</p>
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</blockquote>
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<h4><a name="tag_03_255_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>The <i>getuid</i>() function shall always be successful and no return value is reserved to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_255_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</p>
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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_255_06"></a>EXAMPLES</h4>
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<blockquote>
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<h5><a name="tag_03_255_06_01"></a>Setting the Effective User ID to the Real User ID</h5>
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<p>The following example sets the effective user ID and the real user ID of the current process to the real user ID of the
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caller.</p>
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<pre>
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<tt>#include <unistd.h>
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#include <sys/types.h>
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...
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setreuid(getuid(), getuid());
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...
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_03_255_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_255_08"></a>RATIONALE</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_255_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_255_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="getegid.html"><i>getegid</i>()</a> , <a href="geteuid.html"><i>geteuid</i>()</a> , <a href=
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"getgid.html"><i>getgid</i>()</a> , <a href="setegid.html"><i>setegid</i>()</a> , <a href="seteuid.html"><i>seteuid</i>()</a> , <a
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href="setgid.html"><i>setgid</i>()</a> , <a href="setregid.html"><i>setregid</i>()</a> , <a href=
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"setreuid.html"><i>setreuid</i>()</a> , <a href="setuid.html"><i>setuid</i>()</a> , the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a>, <a href=
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"../basedefs/unistd.h.html"><i><unistd.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_255_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_255_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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</ul>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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<hr>
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<hr size="2" noshade>
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<center><font size="2"><!--footer start-->
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href=
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"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
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]</font></center>
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