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+.\"	$OpenBSD: getgroups.2,v 1.15 2019/07/08 18:48:30 anton Exp $
+.\"	$NetBSD: getgroups.2,v 1.8 1995/02/27 12:32:57 cgd Exp $
+.\"
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getgroups.2	8.2 (Berkeley) 4/16/94
+.\"
+.Dd $Mdocdate: July 8 2019 $
+.Dt GETGROUPS 2
+.Os
+.Sh NAME
+.Nm getgroups
+.Nd get group access list
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn getgroups "int gidsetlen" "gid_t *gidset"
+.Sh DESCRIPTION
+.Fn getgroups
+gets the current group access list of the current user process
+and stores it in the array
+.Fa gidset .
+The parameter
+.Fa gidsetlen
+indicates the number of entries that may be placed in
+.Fa gidset .
+.Fn getgroups
+returns the actual number of groups returned in
+.Fa gidset .
+No more than
+.Dv NGROUPS_MAX
+will ever
+be returned.
+If
+.Fa gidsetlen
+is 0,
+.Fn getgroups
+returns the number of groups without modifying the
+.Fa gidset
+array.
+.Sh RETURN VALUES
+A successful call returns the number of groups in the group set.
+A value of \-1 indicates that an error occurred, and the error
+code is stored in the global variable
+.Va errno .
+.Sh ERRORS
+The possible errors for
+.Fn getgroups
+are:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The argument
+.Fa gidsetlen
+is smaller than the number of groups in the group set.
+.It Bq Er EFAULT
+The argument
+.Fa gidset
+specifies an invalid address.
+.El
+.Sh SEE ALSO
+.Xr getgid 2 ,
+.Xr setgid 2 ,
+.Xr setgroups 2 ,
+.Xr initgroups 3
+.Sh STANDARDS
+The
+.Fn getgroups
+function conforms to
+.St -p1003.1-2008 .
+.Sh HISTORY
+The
+.Fn getgroups
+system call first appeared in
+.Bx 4.1c .