getgid() returns the real group ID of the calling process.
getegid() returns the effective group ID of the calling process.
These functions are always successful.
The original Linux getgid() and getegid() system calls supported only
16-bit group IDs. Subsequently, Linux 2.4 added getgid32() and gete-
gid32(), supporting 32-bit IDs. The glibc getgid() and getegid() wrap-
per functions transparently deal with the variations across kernel ver-
getresgid(2), setgid(2), setregid(2), credentials(7)
This page is part of release 3.54 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2010-11-22 GETGID(2)
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