1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __SCCSID("@(#)pty.c 8.3 (Berkeley) 5/16/94");
34
35 #include <sys/types.h>
36 #include <sys/ioctl.h>
37 #include <sys/stat.h>
38
39 #include <errno.h>
40 #include <fcntl.h>
41 #include <grp.h>
42 #include <libutil.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <termios.h>
46 #include <unistd.h>
47
48 int
openpty(int * amaster,int * aslave,char * name,struct termios * termp,struct winsize * winp)49 openpty(int *amaster, int *aslave, char *name, struct termios *termp,
50 struct winsize *winp)
51 {
52 const char *slavename;
53 int master, slave;
54
55 master = posix_openpt(O_RDWR|O_NOCTTY);
56 if (master == -1)
57 return (-1);
58
59 if (grantpt(master) == -1)
60 goto bad;
61
62 if (unlockpt(master) == -1)
63 goto bad;
64
65 slavename = ptsname(master);
66 if (slavename == NULL)
67 goto bad;
68
69 slave = open(slavename, O_RDWR);
70 if (slave == -1)
71 goto bad;
72
73 *amaster = master;
74 *aslave = slave;
75
76 if (name)
77 strcpy(name, slavename);
78 if (termp)
79 tcsetattr(slave, TCSAFLUSH, termp);
80 if (winp)
81 ioctl(slave, TIOCSWINSZ, (char *)winp);
82
83 return (0);
84
85 bad: close(master);
86 return (-1);
87 }
88
89 int
forkpty(int * amaster,char * name,struct termios * termp,struct winsize * winp)90 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
91 {
92 int master, slave, pid;
93
94 if (openpty(&master, &slave, name, termp, winp) == -1)
95 return (-1);
96 switch (pid = fork()) {
97 case -1:
98 (void)close(master);
99 (void)close(slave);
100 return (-1);
101 case 0:
102 /*
103 * child
104 */
105 (void)close(master);
106 login_tty(slave);
107 return (0);
108 }
109 /*
110 * parent
111 */
112 *amaster = master;
113 (void) close(slave);
114 return (pid);
115 }
116