1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. 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.\" @(#)initgroups.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: src/lib/libc/gen/initgroups.3,v 1.6.2.4 2001/12/14 18:33:51 ru Exp $ 34.\" $DragonFly: src/lib/libc/gen/initgroups.3,v 1.2 2003/06/17 04:26:42 dillon Exp $ 35.\" 36.Dd June 4, 1993 37.Dt INITGROUPS 3 38.Os 39.Sh NAME 40.Nm initgroups 41.Nd initialize group access list 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In unistd.h 46.Ft int 47.Fn initgroups "const char *name" "gid_t basegid" 48.Sh DESCRIPTION 49The 50.Fn initgroups 51function 52uses the 53.Xr getgrouplist 3 54function to calculate the group access list for the user 55specified in 56.Fa name . 57This group list is then setup for the current process using 58.Xr setgroups 2 . 59The 60.Fa basegid 61is automatically included in the groups list. 62Typically this value is given as 63the group number from the password file. 64.Sh RETURN VALUES 65.Rv -std initgroups 66.Sh ERRORS 67The 68.Fn initgroups 69function may fail and set 70.Va errno 71for any of the errors specified for the library function 72.Xr setgroups 2 . 73.Sh SEE ALSO 74.Xr setgroups 2 , 75.Xr getgrouplist 3 76.Sh HISTORY 77The 78.Fn initgroups 79function appeared in 80.Bx 4.2 . 81.Sh BUGS 82The 83.Fn getgrouplist 84function called by 85.Fn initgroups 86uses the routines based on 87.Xr getgrent 3 . 88If the invoking program uses any of these routines, 89the group structure will 90be overwritten in the call to 91.Fn initgroups . 92