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Linux 2.6 - man page for group_member (linux section 3)

GROUP_MEMBER(3) 					     Linux Programmer's Manual						   GROUP_MEMBER(3)

NAME
group_member - test whether a process is in a group
SYNOPSIS
#include <unistd.h> int group_member(gid_t gid); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): group_member(): _GNU_SOURCE
DESCRIPTION
The group_member() function tests whether any of the caller's supplementary group IDs (as returned by getgroups(2)) matches gid.
RETURN VALUE
The group_member() function returns nonzero if any of the caller's supplementary group IDs matches gid, and zero otherwise.
CONFORMING TO
This function is a nonstandard GNU extension.
SEE ALSO
getgid(2), getgroups(2), getgrouplist(3), group(5)
GNU
2014-03-30 GROUP_MEMBER(3)