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.
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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