From 7e0f021a9aec35fd8e6725e87e3313b101d26f5e Mon Sep 17 00:00:00 2001 From: Tobias Klauser Date: Sun, 27 Jan 2008 11:37:44 +0100 Subject: Initial import (2.0.2-6) --- reference/C/MAN/setuid.htm | 99 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 reference/C/MAN/setuid.htm (limited to 'reference/C/MAN/setuid.htm') diff --git a/reference/C/MAN/setuid.htm b/reference/C/MAN/setuid.htm new file mode 100644 index 0000000..f6551d3 --- /dev/null +++ b/reference/C/MAN/setuid.htm @@ -0,0 +1,99 @@ +setuid + +
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SETUID(2)           Linux Programmer's Manual           SETUID(2)
+

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+
NAME
+
       setuid - set user identity
+
+
SYNOPSIS
+
       #include <unistd.h>
+
+       int setuid(uid_t uid)
+
+
DESCRIPTION
+
       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.
+
+
RETURN VALUE
+
       On success, zero is returned.  On error, -1  is  returned,
+       and errno is set appropriately.
+
+
ERRORS
+
       EPERM   The  user  is not the super-user, and uid does not
+               match the effective or saved user ID of the  call-
+               ing process.
+
+
CONFORMING TO
+
       System V
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SEE ALSO +

+getuid, +setreuid, +seteuid, +

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Linux 1.1.36               29 July 1994                         1
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