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SETGID(2)		   Linux Programmer's Manual		     SETGID(2)



NAME
       setgid - set group identity

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

       int setgid(gid_t gid);

DESCRIPTION
       setgid()	 sets  the  effective  group ID of the current process. If the
       caller is the superuser, the real GID and saved set-group-ID  are  also
       set.

       Under  Linux,  setgid()	is implemented like the POSIX version with the
       _POSIX_SAVED_IDS feature.  This allows a set-group-ID program  that  is
       not  set-user-ID-root  to drop all of its group privileges, do some un-
       privileged work, and then re-engage the original effective group ID  in
       a secure manner.

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

ERRORS
       EPERM  The calling  process  is	not  privileged	 (does	not  have  the
	      CAP_SETGID  capability),	and  gid  does not match the effective
	      group ID or saved set-group-ID of the calling process.

CONFORMING TO
       SVr4, POSIX.1-2001.

SEE ALSO
       getgid(2), setegid(2), setregid(2), capabilities(7)



Linux 2.5			  2002-03-09			     SETGID(2)
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