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
33 #include <sys/types.h>
34 #include <sys/ioctl.h>
35 #include <sys/stat.h>
36
37 #include <errno.h>
38 #include <fcntl.h>
39 #include <grp.h>
40 #include <libutil.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <termios.h>
44 #include <unistd.h>
45
46 int
openpty(int * amaster,int * aslave,char * name,struct termios * termp,struct winsize * winp)47 openpty(int *amaster, int *aslave, char *name, struct termios *termp,
48 struct winsize *winp)
49 {
50 const char *slavename;
51 int master, slave;
52
53 master = posix_openpt(O_RDWR|O_NOCTTY);
54 if (master == -1)
55 return (-1);
56
57 if (grantpt(master) == -1)
58 goto bad;
59
60 if (unlockpt(master) == -1)
61 goto bad;
62
63 slavename = ptsname(master);
64 if (slavename == NULL)
65 goto bad;
66
67 slave = open(slavename, O_RDWR);
68 if (slave == -1)
69 goto bad;
70
71 *amaster = master;
72 *aslave = slave;
73
74 if (name)
75 strcpy(name, slavename);
76 if (termp)
77 tcsetattr(slave, TCSAFLUSH, termp);
78 if (winp)
79 ioctl(slave, TIOCSWINSZ, (char *)winp);
80
81 return (0);
82
83 bad: close(master);
84 return (-1);
85 }
86
87 int
forkpty(int * amaster,char * name,struct termios * termp,struct winsize * winp)88 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
89 {
90 int master, slave, pid;
91
92 if (openpty(&master, &slave, name, termp, winp) == -1)
93 return (-1);
94 switch (pid = fork()) {
95 case -1:
96 (void)close(master);
97 (void)close(slave);
98 return (-1);
99 case 0:
100 /*
101 * child
102 */
103 (void)close(master);
104 login_tty(slave);
105 return (0);
106 }
107 /*
108 * parent
109 */
110 *amaster = master;
111 (void) close(slave);
112 return (pid);
113 }
114