group_member3
Test whether a process is in a group
Usage
#include <unistd.h>
int group_member(gid_t gid);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
group_member():
_GNU_SOURCE
Library
Standard C library (libc, -lc)
Overview
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.
Releases
7 releases since Debian 8 (Jessie); the text changed 6 times.