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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, POSIX.1-2001.

SEE ALSO

getgid(2), setegid(2), setregid(2), capabilities(7) Linux 2.5 2002-03-09 SETGID(2)

1994 Man-cgi 1.15, Panagiotis Christias <christia@theseas.ntua.gr>