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

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.
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 informa- tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2009-10-17 SETGID(2)


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