setegid

SETEUID(2)		  Linux Programmer’s Manual		   SETEUID(2)



NAME
       seteuid, setegid - set effective user or group ID

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

       int seteuid(uid_t euid);
       int setegid(gid_t egid);

DESCRIPTION
       seteuid	sets  the effective user ID of the current process.  Unprivi-
       leged user processes may only set the effective user ID	to  the	 real
       user ID, the effective user ID or the saved user ID.

       Precisely the same holds for setegid with "group" instead of "user".


RETURN VALUE
       On  success, zero is returned.  On error, -1 is returned, and errno is
       set appropriately.

ERRORS
       EPERM  The current process is  not  the	super-user  and	 euid  (resp.
	      egid)  is	 not  the  real	 user  (group) ID, the effective user
	      (group) ID or the saved user (group) ID.

NOTES
       Setting the effective user (group) ID to the saved user (group) ID  is
       possible	 since	Linux  1.1.37  (1.1.38).   On an arbitrary system one
       should check _POSIX_SAVED_IDS.

       Under  libc4,  libc5  and  glibc2.0  seteuid(euid)  is  equivalent  to
       setreuid(-1,  euid)  and	 hence	may  change the saved user ID.	Under
       glibc2.1 it is equivalent to setresuid(-1, euid,-1) and hence does not
       change the saved user ID.  Similar remarks hold for setegid.

CONFORMING TO
       BSD 4.3

SEE ALSO
       geteuid(2), setuid(2), setreuid(2), setresuid(2)



Linux 2.4			  2001-05-17			   SETEUID(2)