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SuSE 11.3 - man page for setgid (suse section 2)

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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 supe-
       ruser, 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 fea-
       ture.   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.

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

COLOPHON
       This  page  is  part of release 3.25 of the Linux man-pages project.  A description of the
       project,  and  information  about  reporting  bugs,  can  be  found   at   http://www.ker-
       nel.org/doc/man-pages/.

Linux					    2009-10-17					SETGID(2)
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