GROUP_MEMBER(3) Linux Programmer's Manual GROUP_MEMBER(3)
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)
This page is part of release 4.10 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. GNU 2014-03-30 GROUP_MEMBER(3)
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