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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 calling 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 reengage 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 real group ID
	      or saved set-group-ID of the calling process.

CONFORMING TO
       SVr4, POSIX.1-2001.

NOTES
       The original Linux setgid() system call	supported  only	 16-bit	 group
       IDs.   Subsequently,  Linux 2.4 added setgid32() supporting 32-bit IDs.
       The glibc setgid() wrapper function transparently deals with the varia‐
       tion across kernel versions.

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

COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2010-11-22			     SETGID(2)

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