minix/lib/libc/stdlib/ptsname.3

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.\" $NetBSD: ptsname.3,v 1.5 2008/04/30 13:10:51 martin 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.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 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
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.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 .