GROUP_MEMBER(3) - man page online | library functions

Test whether a process is in a group.

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)
COLOPHON This page is part of release 4.04 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
GNU 2014-03-30 GROUP_MEMBER(3)
This manual Reference Other manuals
group_member(3) referred by getgrouplist(3) | getgroups(2)
refer to feature_test_macros(7) | getgid(2) | getgrouplist(3) | getgroups(2) | group(5)