group_member

(3)

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

LIBRARY

Standard C library (libc, -lc)

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.

GNU.