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+.\" 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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. 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 April 16, 1994
+.Dt GETGROUPS 2
+.Os BSD 4.2
+.Sh NAME
+.Nm getgroups
+.Nd get group access list
+.Sh SYNOPSIS
+.Fd #include <sys/param.h>
+.Fd #include <unistd.h>
+.Ft int
+.Fn getgroups "int gidsetlen" "gid_t *gidset"
+.Sh DESCRIPTION
+.Fn Getgroups
+gets the current group access list of the 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 ,
+as defined in
+.Aq Pa sys/param.h ,
+will ever
+be returned.
+.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 setgroups 2 ,
+.Xr initgroups 3
+.Sh HISTORY
+The
+.Nm
+function call appeared in
+.Bx 4.2 .