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SETREUID(2)		    BSD System Calls Manual		   SETREUID(2)

NAME
     setreuid — set real and effective user ID's

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     setreuid(uid_t ruid, uid_t euid);

DESCRIPTION
     This interface is made obsolete by the saved ID functionality in
     setuid(2) and seteuid(2).

     The real and effective user ID's of the current process are set according
     to the arguments.	If the real user ID is changed, the saved user ID is
     changed to the new value of the effective user ID.

     If ruid or euid is -1, the current uid is filled in by the system.
     Unprivileged users may change the real user ID to the effective user ID,
     and may change the effective user ID to the real user ID or the saved
     user ID; only the super-user may make other changes.

     The setreuid() function has been used to swap the real and effective user
     IDs in set-user-ID programs to temporarily relinquish the set-user-ID
     value.  This purpose is now better served by the use of the seteuid()
     function (see setuid(2)).

     When setting the real and effective user IDs to the same value, this
     function is equivalent to the setuid() function.  When setting only the
     effective user ID, this function is equivalent to the seteuid() function.

RETURN VALUES
     Upon successful completion, a value of 0 is returned.  Otherwise, a value
     of -1 is returned and errno is set to indicate the error.

ERRORS
     [EPERM]		The current process is not the super-user and a change
			other than changing the effective user-id to the real
			user-id was specified.

SEE ALSO
     getuid(2), seteuid(2), setgid(2), setuid(2)

HISTORY
     The setreuid() function call appeared in 4.2BSD.  An incompatible version
     was implemented in 4.4BSD.	 It was reimplemented in NetBSD 1.2 in a way
     compatible with 4.3BSD, SunOS and Linux, but should not be used in new
     code.

BSD				January 5, 2001				   BSD

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