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.
ERRORS
These functions are always successful.
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, 4.3BSD.
NOTES
The original Linux getgid() and getegid() system calls supported only
16-bit group IDs. Subsequently, Linux 2.4 added getgid32() and gete-
gid32(), supporting 32-bit IDs. The glibc getgid() and getegid() wrap-
per functions transparently deal with the variations across kernel ver-
sions.
On Alpha, instead of a pair of getgid() and getegid() system calls, a
single getxgid() system call is provided, which returns a pair of real
and effective GIDs. The glibc getgid() and getegid() wrapper functions
transparently deal with this. See syscall(2) for details regarding
register mapping.
SEE ALSO
getresgid(2), setgid(2), setregid(2), credentials(7)
COLOPHON
This page is part of release 5.07 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2019-03-06 GETGID(2)