Manpage of GETGID
GETGIDSection: Linux Programmer's Manual (2)
NAMEgetgid, getegid - get group identity
DESCRIPTIONgetgid() returns the real group ID of the calling process.
ERRORSThese functions are always successful.
CONFORMING TOPOSIX.1-2001, POSIX.1-2008, 4.3BSD.
NOTESThe 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.
SEE ALSOgetresgid(2), setgid(2), setregid(2), credentials(7)
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Time: 22:27:44 GMT, June 20, 2016