getgid, getegid - get group identity
getgid() returns the real group ID of the calling process.
getegid() returns the effective group ID of the calling
These functions are always successful and never modify errno.
POSIX.1-2001, POSIX.1-2008, 4.3BSD.
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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