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CentOS 7.0 - man page for getegid (centos section 2)

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, 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() wrapper functions transparently deal with the variations across kernel versions.
SEE ALSO
getresgid(2), setgid(2), setregid(2), credentials(7)
COLOPHON
This page is part of release 3.53 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 2010-11-22 GETGID(2)