153 lines
5.1 KiB
HTML
153 lines
5.1 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>setreuid</title>
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<basefont size="3"> <a name="setreuid"></a> <a name="tag_03_664"></a><!-- setreuid -->
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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_664_01"></a>NAME</h4>
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<blockquote>setreuid - set real and effective user IDs</blockquote>
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<h4><a name="tag_03_664_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/unistd.h.html">unistd.h</a>><br>
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<br>
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int setreuid(uid_t</tt> <i>ruid</i><tt>, uid_t</tt> <i>euid</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border=
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"0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_664_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>setreuid</i>() function shall set the real and effective user IDs of the current process to the values specified by the
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<i>ruid</i> and <i>euid</i> arguments. If <i>ruid</i> or <i>euid</i> is -1, the corresponding effective or real user ID of the
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current process shall be left unchanged.</p>
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<p>A process with appropriate privileges can set either ID to any value. An unprivileged process can only set the effective user ID
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if the <i>euid</i> argument is equal to either the real, effective, or saved user ID of the process.</p>
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<p>It is unspecified whether a process without appropriate privileges is permitted to change the real user ID to match the current
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real, effective, or saved set-user-ID of the process.</p>
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</blockquote>
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<h4><a name="tag_03_664_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, 0 shall be 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_664_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>setreuid</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>ruid</i> or <i>euid</i> argument is invalid or out-of-range.</dd>
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<dt>[EPERM]</dt>
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<dd>The current process does not have appropriate privileges, and either an attempt was made to change the effective user ID to a
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value other than the real user ID or the saved set-user-ID or an attempt was made to change the real user ID to a value not
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permitted by the implementation.</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_664_06"></a>EXAMPLES</h4>
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<blockquote>
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<h5><a name="tag_03_664_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 of the calling process to the real user ID, so that files created later will be
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owned by the current user.</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_664_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_664_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_664_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_664_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="getuid.html"><i>getuid</i>()</a> , <a href="setegid.html"><i>setegid</i>()</a> , <a
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href="seteuid.html"><i>seteuid</i>()</a> , <a href="setgid.html"><i>setgid</i>()</a> , <a href=
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"setregid.html"><i>setregid</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/unistd.h.html"><i><unistd.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_664_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4, Version 2.</p>
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</blockquote>
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<h4><a name="tag_03_664_12"></a>Issue 5</h4>
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<blockquote>
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<p>Moved from X/OPEN UNIX extension to BASE.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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