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authorTobias Klauser <tklauser@distanz.ch>2008-01-27 11:37:44 +0100
committerTobias Klauser <tklauser@xenon.tklauser.home>2008-01-27 11:37:44 +0100
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+<TITLE>setuid</TITLE>
+<body bgcolor="#ffffcc">
+<hr>
+<pre>
+
+
+
+<h3>SETUID(2) Linux Programmer's Manual SETUID(2)
+</h3>
+
+<h3>NAME
+</h3> setuid - set user identity
+
+<h3>SYNOPSIS
+</h3> #include &lt;unistd.h&gt;
+
+ int setuid(uid_t uid)
+
+<h3>DESCRIPTION
+</h3> setuid sets the effective user ID of the current process.
+ If the caller is the superuser, the real and saved user
+ ID's are also set.
+
+ Under Linux, setuid is implemented like SYSV with
+ SAVED_IDS. This allows a setuid (other than root) program
+ to drop all of it's user privileges, do some un-privileged
+ work, and then re-engage the original effective user ID in
+ a secure manner.
+
+ If the user is root or the program is setuid root, special
+ care must be taken. The setuid function checks the effec-
+ tive uid of the caller and if it is the superuser, all
+ process related user ID's are set to uid. After this has
+ occurred, it is impossible for the program to regain root
+ privileges.
+
+<h3>RETURN VALUE
+</h3> On success, zero is returned. On error, -1 is returned,
+ and errno is set appropriately.
+
+<h3>ERRORS
+</h3> EPERM The user is not the super-user, and uid does not
+ match the effective or saved user ID of the call-
+ ing process.
+
+<h3>CONFORMING TO
+</h3> System V
+
+</pre>
+<hr>
+<h3>SEE ALSO
+</h3><p>
+<a href=getuid.htm>getuid</a>,
+<a href=setreuid.htm>setreuid</a>,
+<a href=seteuid.htm>seteuid</a>,
+<pre>
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<h3>Linux 1.1.36 29 July 1994 1
+</h3>
+
+ </pre>
+<P>
+<hr>
+<p>
+<center>
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+
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