1/*
2 * Copyright (c) 1999, 2007 Apple 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 * Copyright (c) 1990, 1993, 1994
25 *	The Regents of the University of California.  All rights reserved.
26 *
27 * Redistribution and use in source and binary forms, with or without
28 * modification, are permitted provided that the following conditions
29 * are met:
30 * 1. Redistributions of source code must retain the above copyright
31 *    notice, this list of conditions and the following disclaimer.
32 * 2. Redistributions in binary form must reproduce the above copyright
33 *    notice, this list of conditions and the following disclaimer in the
34 *    documentation and/or other materials provided with the distribution.
35 * 3. All advertising materials mentioning features or use of this software
36 *    must display the following acknowledgement:
37 *	This product includes software developed by the University of
38 *	California, Berkeley and its contributors.
39 * 4. Neither the name of the University nor the names of its contributors
40 *    may be used to endorse or promote products derived from this software
41 *    without specific prior written permission.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * SUCH DAMAGE.
54 */
55
56
57#include <sys/types.h>
58#include <sys/ioctl.h>
59#include <sys/stat.h>
60
61#include <errno.h>
62#include <fcntl.h>
63#include <grp.h>
64#include <stdio.h>
65#include <stdlib.h>
66#include <string.h>
67#include <termios.h>
68#include <unistd.h>
69#include <util.h>
70#include <syslog.h>
71
72int openpty(amaster, aslave, name, termp, winp)
73	int *amaster, *aslave;
74	char *name;
75	struct termios *termp;
76	struct winsize *winp;
77{
78	int master, slave;
79	char *sname;
80
81	if ((master = posix_openpt(O_RDWR|O_NOCTTY)) < 0)
82		return -1;
83	if (grantpt(master) < 0 || unlockpt(master) < 0
84	    || (sname = ptsname(master)) == NULL
85	    || (slave = open(sname, O_RDWR|O_NOCTTY, 0)) < 0) {
86		(void) close(master);
87		return -1;
88	}
89	*amaster = master;
90	*aslave = slave;
91	if (name)
92		strcpy(name, sname);
93	if (termp)
94		(void) tcsetattr(slave, TCSAFLUSH, termp);
95	if (winp)
96		(void) ioctl(slave, TIOCSWINSZ, (char *)winp);
97	return (0);
98}
99
100int
101forkpty(amaster, name, termp, winp)
102	int *amaster;
103	char *name;
104	struct termios *termp;
105	struct winsize *winp;
106{
107	int master, slave, pid;
108
109	if (openpty(&master, &slave, name, termp, winp) == -1)
110		return (-1);
111	switch (pid = fork()) {
112	case -1:
113		return (-1);
114	case 0:
115		/*
116		 * child
117		 */
118		(void) close(master);
119		/*
120		 * 4300297: login_tty() may fail to set the controlling tty.
121		 * Since we have already forked, the best we can do is to
122		 * dup the slave as if login_tty() succeeded.
123		 */
124		if (login_tty(slave) < 0) {
125			syslog(LOG_ERR, "forkpty: login_tty could't make controlling tty");
126			(void) dup2(slave, 0);
127			(void) dup2(slave, 1);
128			(void) dup2(slave, 2);
129			if (slave > 2)
130				(void) close(slave);
131		}
132		return (0);
133	}
134	/*
135	 * parent
136	 */
137	*amaster = master;
138	(void) close(slave);
139	return (pid);
140}
141