GROUP_MEMBER(3)

NAME
group_member - test whether a process is in a group

LIBRARY
Standard C library (libc, -lc)

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.

STANDARDS
This function is a nonstandard GNU extension.

SEE ALSO
getgid(2), getgroups(2), getgrouplist(3), group(5)