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-.\" Copyright (C) 2014, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH group_member 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-group_member \- test whether a process is in a group
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "int group_member(gid_t " gid );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR group_member ():
-.nf
-    _GNU_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR group_member ()
-function tests whether any of the caller's supplementary group IDs
-(as returned by
-.BR getgroups (2))
-matches
-.IR gid .
-.SH RETURN VALUE
-The
-.BR group_member ()
-function returns nonzero if any of the caller's
-supplementary group IDs matches
-.IR gid ,
-and zero otherwise.
-.SH STANDARDS
-GNU.
-.SH SEE ALSO
-.BR getgid (2),
-.BR getgroups (2),
-.BR getgrouplist (3),
-.BR group (5)