GETGID
Section: Linux Programmer's Manual (2)
Updated: 2019-03-06
Page Index
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.
SEE ALSO
getresgid(2),
setgid(2),
setregid(2),
credentials(7)
COLOPHON
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