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2019-03-06
Aliases: getegid(2), getegid(2), getegid(2), getegid(2), getegid(2), getegid(2), getegid(2), getegid(2), getegid(2), getegid(2), getegid(2), getegid(2), getegid32(2), getegid32(2), getegid32(2), getgid32(2), getgid32(2), getgid32(2), getgid32(2), getgid32(2), getgid32(2), getgid32(2), getgid32(2), getgid32(2), getgid32(2)

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Linux kernel and C library user-space interface documentation

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 getegid32(), supporting 32-bit IDs. The glibc getgid() and getegid() wrapper functions transparently deal with the variations across kernel versions.
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.
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