SETGID
Section: Linux Programmer's Manual (2)Updated: 2002-03-09
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NAME
setgid - set group identitySYNOPSIS
#include <sys/types.h>#include <unistd.h>
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 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, POSIX.1-2001.SEE ALSO
getgid(2), setegid(2), setregid(2), capabilities(7), credentials(7)COLOPHON
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Time: 05:33:05 GMT, December 24, 2015