📄 setuid.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>setuid</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_008_504">&nbsp;</a>NAME</h4><blockquote>setuid - set-user-ID</blockquote><h4><a name = "tag_000_008_505">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="systypes.h.html">sys/types.h</a>&gt;#include &lt;<a href="unistd.h.html">unistd.h</a>&gt;int setuid(uid_t <i>uid</i>);</code></pre></blockquote><h4><a name = "tag_000_008_506">&nbsp;</a>DESCRIPTION</h4><blockquote>If the process has appropriate privileges,<i>setuid()</i>sets the real user ID, effective user ID,and the saved set-user-IDto<i>uid</i>.<p>If the process does not have appropriate privileges, but<i>uid</i>is equal to the real user IDor the saved set-user-ID,<i>setuid()</i>sets the effective user ID to<i>uid</i>;the real user IDand saved set-user-IDremain unchanged.</blockquote><h4><a name = "tag_000_008_507">&nbsp;</a>RETURN VALUE</h4><blockquote>Upon successful completion, 0 is returned.  Otherwise, -1 is returned and<i>errno</i>is set to indicate the error.</blockquote><h4><a name = "tag_000_008_508">&nbsp;</a>ERRORS</h4><blockquote>The<i>setuid()</i>function will fail and return -1 and set<i>errno</i>to the corresponding valueif one or more of the following are true:<dl compact><dt>[EINVAL]<dd>The value of the<i>uid</i>argument is invalid and not supported by the implementation.<dt>[EPERM]<dd>The process does not have appropriate privileges and<i>uid</i>does not match the real user ID&nbsp;or the saved set-user-ID.</dl></blockquote><h4><a name = "tag_000_008_509">&nbsp;</a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_510">&nbsp;</a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_511">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_512">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="exec.html">exec</a></i>,<i><a href="geteuid.html">geteuid()</a></i>,<i><a href="getuid.html">getuid()</a></i>,<i><a href="setgid.html">setgid()</a></i>,<i><a href="systypes.h.html">&lt;sys/types.h&gt;</a></i>,<i><a href="unistd.h.html">&lt;unistd.h&gt;</a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</blockquote><hr size=2 noshade><center><font size=2>UNIX &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>
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