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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
       EINVAL The group	ID specified in	gid is not valid in  this  user	 name-
	      space.

       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),
       user_namespaces(7)

COLOPHON
       This  page  is  part of release 3.74 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest	  version     of     this    page,    can    be	   found    at
       http://www.kernel.org/doc/man-pages/.

Linux				  2014-09-21			     SETGID(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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