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SETREUID(2)		  FreeBSD 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
     The real and effective user IDs of	the current process are	set according
     to	the arguments.	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	effec-
     tive user ID and vice-versa; only the super-user may make other changes.

     If	the real user ID is changed (i.e. ruid is not -1) or the effective
     user ID is	changed	to something other than	the real user ID, then the
     saved user	ID will	be set to the effective	user ID.

     The setreuid() system call	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(2)
     system call.

     When setting the real and effective user IDs to the same value, the stan-
     dard setuid() system call is preferred.

RETURN VALUES
     The setreuid() function returns the value 0 if successful;	otherwise the
     value -1 is returned and the global variable 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),	issetugid(2), seteuid(2), setuid(2)

HISTORY
     The setreuid() system call	appeared in 4.2BSD.

FreeBSD	10.1		       February	8, 2001			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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