NetBSD/lib/libc/stdlib/ptsname.3

109 lines
3.3 KiB
Groff

.\" $NetBSD: ptsname.3,v 1.4 2004/07/01 10:38:28 kleink Exp $
.\"
.\" Copyright (c) 2004 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Christos Zoulas.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" 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 NetBSD
.\" Foundation, Inc. and its contributors.
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
.\" contributors may be used to endorse or promote products derived
.\" from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd May 25, 2004
.Dt PTSNAME 3
.Os
.Sh NAME
.Nm ptsname
.Nd get the pathname of the slave pseudo-terminal device
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.Ft char *
.Fn ptsname "int masterfd"
.Sh DESCRIPTION
The
.Fn ptsname
function returns the pathname of the slave pseudo-terminal device
that corresponds to the master pseudo-terminal device associated with
.Fa masterfd .
The
.Fn ptsname
function is not reentrant or thread-safe.
.Sh RETURN VALUES
If successful,
.Fn ptsname
returns a pointer to a nul-terminated string containing the pathname
of the slave pseudo-terminal device.
If an error occurs
.Fn ptsname
will return
.Dv NULL
and
.Va errno
is set to indicate the error.
.Sh ERRORS
The
.Fn ptsname
function will fail if:
.Bl -tag -width Er
.It Bq Er EACCESS
the corresponding pseudo-terminal device could not be accessed.
.It Bq Er EBADF
.Fa masterfd
is not a valid descriptor.
.It Bq Er EINVAL
.Fa masterfd
is not associated with a master pseudo-terminal device.
.El
.Sh NOTES
The error returns of
.Fn ptsname
are a
.Nx
extension.
The
.Fn ptsname
function is equivalent to:
.Bd -literal
struct ptmget pm;
return ioctl(masterfd, TIOCPTSNAME, \*[Am]pm) == -1 ? NULL : pm.ps;
.Ed
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr grantpt 3 ,
.Xr posix_openpt 3 ,
.Xr unlockpt 3
.Sh STANDARDS
The
.Fn ptsname
function conforms to
.St -p1003.1-2001 .
Its first release was in
.St -xpg4.2 .