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.\" $OpenBSD: getusershell.3,v 1.14 2013/06/05 03:39:22 tedu Exp $
.\"
.\" Copyright (c) 1985, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\"
.Dd $Mdocdate: June 5 2013 $
.Dt GETUSERSHELL 3
.Os
.Sh NAME
.Nm getusershell ,
.Nm setusershell ,
.Nm endusershell
.Nd get legal user shells
.Sh SYNOPSIS
.In unistd.h
.Ft char *
.Fn getusershell void
.Ft void
.Fn setusershell void
.Ft void
.Fn endusershell void
.Sh DESCRIPTION
The
.Fn getusershell
function returns a pointer to a legal user shell as defined by the
system manager in the file
.Pa /etc/shells .
If
.Pa /etc/shells
is unreadable or does not exist,
.Fn getusershell
behaves as if only
.Pa /bin/sh ,
.Pa /bin/csh
and
.Pa /bin/ksh
were listed in the file.
.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 on
.Dv EOF .
.Sh SEE ALSO
.Xr shells 5
.Sh HISTORY
The
.Fn getusershell
function appeared in
.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.
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