linux man page for group_member

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)