1.\" $NetBSD: getusershell.3,v 1.6 1999/03/22 19:44:42 garbled Exp $ 2.\" $FreeBSD$ 3.\" 4.\" Copyright (c) 1985, 1991, 1993 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. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)getusershell.3 8.1 (Berkeley) 6/4/93 36.\" 37.Dd January 16, 1999 38.Dt GETUSERSHELL 3 39.Os 40.Sh NAME 41.Nm getusershell , 42.Nm setusershell , 43.Nm endusershell 44.Nd get valid user shells 45.Sh LIBRARY 46.Lb libc 47.Sh SYNOPSIS 48.Fd #include <unistd.h> 49.Ft char * 50.Fn getusershell void 51.Ft void 52.Fn setusershell void 53.Ft void 54.Fn endusershell void 55.Sh DESCRIPTION 56The 57.Fn getusershell 58function 59returns a pointer to a valid user shell as defined by the 60system manager in the shells database as described in 61.Xr shells 5 . 62If the shells database is not available, 63.Fn getusershell 64behaves as if 65.Pa /bin/sh 66and 67.Pa /bin/csh 68were listed. 69.Pp 70The 71.Fn getusershell 72function 73reads the next 74line (opening the file if necessary); 75.Fn setusershell 76rewinds the file; 77.Fn endusershell 78closes it. 79.Sh FILES 80.Bl -tag -width /etc/shells -compact 81.It Pa /etc/shells 82.El 83.Sh DIAGNOSTICS 84The routine 85.Fn getusershell 86returns a null pointer (0) on 87.Dv EOF . 88.Sh SEE ALSO 89.Xr nsswitch.conf 5 , 90.Xr shells 5 91.Sh HISTORY 92The 93.Fn getusershell 94function appeared in 95.Bx 4.3 . 96.Sh BUGS 97The 98.Fn getusershell 99function leaves its result in an internal static object and returns 100a pointer to that object. 101Subsequent calls to 102.Fn getusershell 103will modify the same object. 104