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.\" @(#)setgroups.2 6.7 (Berkeley) 3/10/91 33.\" 34.Dd March 10, 1991 35.Dt SETGROUPS 2 36.Os BSD 4.2 37.Sh NAME 38.Nm setgroups 39.Nd set group access list 40.Sh SYNOPSIS 41.Fd #include <unistd.h> 42.Fd #include <sys/param.h> 43.Ft int 44.Fn setgroups "int ngroups" "const int *gidset" 45.Sh DESCRIPTION 46.Fn Setgroups 47sets the group access list of the current user process 48according to the array 49.Fa gidset . 50The parameter 51.Fa ngroups 52indicates the number of entries in the array and must be no 53more than 54.Dv NGROUPS , 55as defined in 56.Ao Pa sys/param.h Ac . 57.Pp 58Only the super-user may set new groups. 59.Sh RETURN VALUES 60A 0 value is returned on success, -1 on error, with 61an error code stored in 62.Va errno . 63.Sh ERRORS 64The 65.Fn setgroups 66call will fail if: 67.Bl -tag -width Er 68.It Bq Er EPERM 69The caller is not the super-user. 70.It Bq Er EFAULT 71The address specified for 72.Fa gidset 73is outside the process 74address space. 75.El 76.Sh SEE ALSO 77.Xr getgroups 2 , 78.Xr initgroups 3 79.Sh BUGS 80The 81.Fa gidset 82array should be of type 83.Em gid_t , 84but remains integer for compatibility with earlier systems. 85.Sh HISTORY 86The 87.Nm 88function call appeared in 89.Bx 4.2 . 90