linux man page for getgid

GETGID(2)						     Linux Programmer's Manual							 GETGID(2)

NAME
       getgid, getegid - get group identity

SYNOPSIS
       #include <unistd.h>
       #include <sys/types.h>

       gid_t getgid(void);
       gid_t getegid(void);

DESCRIPTION
       getgid() returns the real group ID of the calling process.

       getegid() returns the effective group ID of the calling process.

       When  a	normal program is executed, the effective and real group ID of the process are set to the group ID of the user executing the file.
       When a set ID program is executed the real group ID is set to the group of the calling user and the effective user ID  corresponds  to  the
       set group ID bit on the file being executed.

ERRORS
       These functions are always successful.

CONFORMING TO
       POSIX.1-2001, 4.3BSD.

SEE ALSO
       getresgid(2), setgid(2), setregid(2), credentials(7)

COLOPHON
       This  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 http://www.kernel.org/doc/man-pages/.

Linux								    1993-07-23								 GETGID(2)