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SETUID(2)		  FreeBSD System Calls Manual		     SETUID(2)

NAME
     setuid, seteuid, setgid, setegid, -- set user and group ID

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <unistd.h>

     int
     setuid(uid_t uid);

     int
     seteuid(uid_t euid);

     int
     setgid(gid_t gid);

     int
     setegid(gid_t egid);

DESCRIPTION
     The setuid() function sets	the real and effective user IDs	and the	saved
     set-user-ID of the	current	process	to the specified value.	 The setuid()
     function is permitted if the specified ID is equal	to the real user ID or
     the effective user	ID of the process, or if the effective user ID is that
     of	the super user.

     The setgid() function sets	the real and effective group IDs and the saved
     set-group-ID of the current process to the	specified value.  The setgid()
     function is permitted if the specified ID is equal	to the real group ID
     or	the effective group ID of the process, or if the effective user	ID is
     that of the super user.

     The seteuid() function (setegid())	sets the effective user	ID (group ID)
     of	the current process.  The effective user ID may	be set to the value of
     the real user ID or the saved set-user-ID (see intro(2) and execve(2));
     in	this way, the effective	user ID	of a set-user-ID executable may	be
     toggled by	switching to the real user ID, then re-enabled by reverting to
     the set-user-ID value.  Similarly,	the effective group ID may be set to
     the value of the real group ID or the saved set-group-ID.

RETURN VALUES
     Upon successful completion, the value 0 is	returned; otherwise the
     value -1 is returned and the global variable errno	is set to indicate the
     error.

ERRORS
     The functions will	fail if:

     [EPERM]		The user is not	the super user and the ID specified is
			not the	real, effective	ID, or saved ID.

SEE ALSO
     getgid(2),	getuid(2), issetugid(2), setregid(2), setreuid(2)

STANDARDS
     The setuid() and setgid() functions are compliant with the	ISO/IEC
     9945-1:1990 (``POSIX.1'') specification with _POSIX_SAVED_IDS not defined
     with the permitted	extensions from	Appendix B.4.2.2.  The seteuid() and
     setegid() functions are extensions	based on the POSIX concept of
     _POSIX_SAVED_IDS, and have	been proposed for a future revision of the
     standard.

HISTORY
     A setuid()	and a setgid() function	calls appeared in Version 7 AT&T UNIX.

FreeBSD	10.1			 June 4, 1993			  FreeBSD 10.1

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

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