NAMEsetgid - set group identity
SYNOPSIS#include <sys/types.h> #include <unistd.h> int setgid(gid_t gid);
DESCRIPTIONsetgid() 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 VALUEOn success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORSEPERM 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 TOSVr4, POSIX.1-2001.
SEE ALSOgetgid(2), setegid(2), setregid(2), capabilities(7), credentials(7)
COLOPHONThis page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at //www.kernel.org/doc/man-pages/. SETGID(2)