1.\" $OpenBSD: setgroups.2,v 1.8 2003/06/02 20:18:39 millert Exp $ 2.\" $NetBSD: setgroups.2,v 1.7 1995/02/27 12:36:49 cgd Exp $ 3.\" 4.\" Copyright (c) 1983, 1991, 1993, 1994 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)setgroups.2 8.2 (Berkeley) 4/16/94 32.\" 33.Dd April 16, 1994 34.Dt SETGROUPS 2 35.Os 36.Sh NAME 37.Nm setgroups 38.Nd set group access list 39.Sh SYNOPSIS 40.Fd #include <sys/types.h> 41.Fd #include <unistd.h> 42.Ft int 43.Fn setgroups "int ngroups" "const gid_t *gidset" 44.Sh DESCRIPTION 45.Fn setgroups 46sets the group access list of the current user process 47according to the array 48.Fa gidset . 49The parameter 50.Fa ngroups 51indicates the number of entries in the array and must be no 52more than 53.Dv {NGROUPS_MAX} . 54.Pp 55Only the superuser may set new groups. 56.Sh RETURN VALUES 57A 0 value is returned on success, \-1 on error, with 58an error code stored in 59.Va errno . 60.Sh ERRORS 61The 62.Fn setgroups 63call will fail if: 64.Bl -tag -width Er 65.It Bq Er EINVAL 66The value of 67.Fa ngroups 68is greater than 69.Dv {NGROUPS_MAX} . 70.It Bq Er EPERM 71The caller is not the superuser. 72.It Bq Er EFAULT 73The address specified for 74.Fa gidset 75is outside the process 76address space. 77.El 78.Sh SEE ALSO 79.Xr getgroups 2 , 80.Xr initgroups 3 81.Sh HISTORY 82The 83.Fn setgroups 84function call appeared in 85.Bx 4.2 . 86