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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, SVID.
SEE ALSO
getgid(2), setegid(2), setregid(2), capabilities(7)
Linux 2.5 2002-03-09 SETGID(2)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Tue Feb 13 02:17:42 GMT 2007
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