1.\" Copyright (c) 1983, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)setgroups.2 6.7 (Berkeley) 3/10/91 33.\" $Id: setgroups.2,v 1.3 1993/11/25 00:39:36 jtc Exp $ 34.\" 35.Dd March 10, 1991 36.Dt SETGROUPS 2 37.Os BSD 4.2 38.Sh NAME 39.Nm setgroups 40.Nd set group access list 41.Sh SYNOPSIS 42.Fd #include <unistd.h> 43.Fd #include <sys/param.h> 44.Ft int 45.Fn setgroups "int ngroups" "const int *gidset" 46.Sh DESCRIPTION 47.Fn Setgroups 48sets the group access list of the current user process 49according to the array 50.Fa gidset . 51The parameter 52.Fa ngroups 53indicates the number of entries in the array and must be no 54more than 55.Dv NGROUPS , 56as defined in 57.Ao Pa sys/param.h Ac . 58.Pp 59Only the super-user may set new groups. 60.Sh RETURN VALUES 61A 0 value is returned on success, -1 on error, with 62an error code stored in 63.Va errno . 64.Sh ERRORS 65The 66.Fn setgroups 67call will fail if: 68.Bl -tag -width Er 69.It Bq Er EPERM 70The caller is not the super-user. 71.It Bq Er EFAULT 72The address specified for 73.Fa gidset 74is outside the process 75address space. 76.El 77.Sh SEE ALSO 78.Xr getgroups 2 , 79.Xr initgroups 3 80.Sh BUGS 81The 82.Fa gidset 83array should be of type 84.Em gid_t , 85but remains integer for compatibility with earlier systems. 86.Sh HISTORY 87The 88.Fn setgroups 89function call appeared in 90.Bx 4.2 . 91