Manpages - getgid.2
Table of Contents
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NAME
getgid, getegid - get group identity
SYNOPSIS
#include <unistd.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 and never modify errno.
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.
SEE ALSO
*getresgid*(2), *setgid*(2), *setregid*(2), *credentials*(7)
COLOPHON
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