1/*
2 * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24#include <stdlib.h>
25#include <sys/ioctl.h>
26#include <sys/stat.h>
27#include <fcntl.h>
28#include <errno.h>
29
30/*
31 * posix_openpt call for cloning pty implementation.
32 *
33 * Just open /dev/ptmx
34 */
35int
36posix_openpt(int flags)
37{
38	int fd = open("/dev/ptmx", flags);
39	if (fd >= 0)
40		return fd;
41	return -1;
42}
43
44/*
45 * grantpt call for cloning pty implementation.
46 *
47 * Change UID and GID of slave pty associated with master pty whose
48 * fd is provided, to the real UID and real GID of the calling thread.
49 */
50int
51grantpt(int fd)
52{
53	return ioctl(fd, TIOCPTYGRANT);
54}
55
56/*
57 * ptsname call for cloning pty implementation.
58 *
59 * NOTE: Returns a pointer to a static buffer, which will be overwritten on
60 * subsequent calls.
61 */
62char *
63ptsname(int fd)
64{
65	static char *ptsnamebuf = NULL;
66	int error;
67	char *retval = NULL;
68	struct stat sbuf;
69
70	if (ptsnamebuf == NULL) {
71		ptsnamebuf = malloc(128); // defined by TIOCPTYGNAME
72	}
73
74	error = ioctl(fd, TIOCPTYGNAME, ptsnamebuf);
75	if (!error) {
76		/*
77		 * XXX TSD
78		 *
79		 * POSIX: Handle device rename test case, which is expected
80		 * to fail if the pty has been renamed.
81		 */
82		if (stat(ptsnamebuf, &sbuf) == 0) {
83			retval = ptsnamebuf;
84		}
85	}
86
87	return (retval);
88}
89
90/*
91 * unlockpt call for cloning pty implementation.
92 *
93 * Unlock the slave pty associated with the master to which fd refers.
94 */
95int
96unlockpt(int fd)
97{
98	return ioctl(fd, TIOCPTYUNLK);
99}
100