NetBSD/lib/libc/gen/getusershell.3

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.\" $NetBSD: getusershell.3,v 1.7 2001/09/16 02:30:24 wiz Exp $
.\"
.\" Copyright (c) 1985, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" modification, are permitted provided that the following conditions
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.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
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.\" @(#)getusershell.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd January 16, 1999
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.Dt GETUSERSHELL 3
.Os
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.Sh NAME
.Nm getusershell ,
.Nm setusershell ,
.Nm endusershell
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.Nd get valid user shells
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.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.Ft char *
.Fn getusershell void
.Ft void
.Fn setusershell void
.Ft void
.Fn endusershell void
.Sh DESCRIPTION
The
.Fn getusershell
function
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returns a pointer to a valid user shell as defined by the
system manager in the shells database as described in
.Xr shells 5 .
If the shells database is not available,
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.Fn getusershell
behaves as if
.Pa /bin/sh
and
.Pa /bin/csh
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were listed.
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.Pp
The
.Fn getusershell
function
reads the next
line (opening the file if necessary);
.Fn setusershell
rewinds the file;
.Fn endusershell
closes it.
.Sh FILES
.Bl -tag -width /etc/shells -compact
.It Pa /etc/shells
.El
.Sh DIAGNOSTICS
The routine
.Fn getusershell
returns a null pointer (0) on
.Dv EOF .
.Sh SEE ALSO
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.Xr nsswitch.conf 5 ,
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.Xr shells 5
.Sh HISTORY
The
.Fn getusershell
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function appeared in
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.Bx 4.3 .
.Sh BUGS
The
.Fn getusershell
function leaves its result in an internal static object and returns
a pointer to that object. Subsequent calls to
.Fn getusershell
will modify the same object.