2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
7 * Portions of this software were developed under sponsorship from Snow
8 * B.V., the Netherlands.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 #include "namespace.h"
38 #include <sys/param.h>
39 #include <sys/ioctl.h>
44 #include "un-namespace.h"
47 * __isptmaster(): return whether the file descriptor refers to a
48 * pseudo-terminal master device.
51 __isptmaster(int fildes)
54 if (_ioctl(fildes, TIOCPTMASTER) == 0)
64 * In our implementation, grantpt() and unlockpt() don't actually have
65 * any use, because PTY's are created on the fly and already have proper
66 * permissions upon creation.
68 * Just make sure `fildes' actually points to a real PTY master device.
70 __strong_reference(__isptmaster, grantpt);
71 __strong_reference(__isptmaster, unlockpt);
74 * ptsname(): return the pathname of the slave pseudo-terminal device
75 * associated with the specified master.
80 static char pt_slave[sizeof _PATH_DEV + SPECNAMELEN] = _PATH_DEV;
83 /* Make sure fildes points to a master device. */
84 if (__isptmaster(fildes) != 0)
87 if (fdevname_r(fildes, pt_slave + (sizeof _PATH_DEV - 1),
88 sizeof pt_slave - (sizeof _PATH_DEV - 1)) != NULL)