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.TH GROUP_MEMBER 3 2021-03-22 "GNU" "Linux Programmer's Manual"
.SH NAME
group_member \- test whether a process is in a group
.SH SYNOPSIS
.nf
.B #include <unistd.h>
.PP
.BI "int group_member(gid_t " gid );
.fi
.PP
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
.PP
.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 CONFORMING TO
This function is a nonstandard GNU extension.
.SH SEE ALSO
.BR getgid (2),
.BR getgroups (2),
.BR getgrouplist (3),
.BR group (5)