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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. 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 January 21, 2011
-.Dt GETGROUPS 2
-.Os
-.Sh NAME
-.Nm getgroups
-.Nd get group access list
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In unistd.h
-.Ft int
-.Fn getgroups "int gidsetlen" "gid_t *gidset"
-.Sh DESCRIPTION
-The
-.Fn getgroups
-system call
-gets the current group access list of the user process
-and stores it in the array
-.Fa gidset .
-The
-.Fa gidsetlen
-argument
-indicates the number of entries that may be placed in
-.Fa gidset .
-The
-.Fn getgroups
-system call
-returns the actual number of groups returned in
-.Fa gidset .
-At least one and as many as {NGROUPS_MAX}+1 values may be returned.
-If
-.Fa gidsetlen
-is zero,
-.Fn getgroups
-returns the number of supplementary group IDs associated with
-the calling process without modifying the array pointed to by
-.Fa gidset .
-.Pp
-The value of
-.Dv {NGROUPS_MAX}
-should be obtained using
-.Xr sysconf 3
-to avoid hard-coding it into the executable.
-.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 ,
-.Xr sysconf 3
-.Sh STANDARDS
-The
-.Fn getgroups
-system call conforms to
-.St -p1003.1-2008 .
-.Sh HISTORY
-The
-.Fn getgroups
-system call appeared in
-.Bx 4.2 .