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