1 /*
2 * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
14 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #include <sys/types.h>
18 #include <sys/ioctl.h>
19
20 #include <fcntl.h>
21 #include <stdlib.h>
22 #include <unistd.h>
23
24 #include "compat.h"
25
26 void fatal(const char *, ...);
27 void fatalx(const char *, ...);
28
29 pid_t
forkpty(int * master,char * name,struct termios * tio,struct winsize * ws)30 forkpty(int *master, char *name, struct termios *tio, struct winsize *ws)
31 {
32 int slave = -1;
33 char *path;
34 pid_t pid;
35
36 if ((*master = open("/dev/ptmx", O_RDWR|O_NOCTTY)) == -1)
37 return (-1);
38 if (grantpt(*master) != 0)
39 goto out;
40 if (unlockpt(*master) != 0)
41 goto out;
42
43 if ((path = ptsname(*master)) == NULL)
44 goto out;
45 if (name != NULL)
46 strlcpy(name, path, TTY_NAME_MAX);
47 if ((slave = open(path, O_RDWR|O_NOCTTY)) == -1)
48 goto out;
49
50 switch (pid = fork()) {
51 case -1:
52 goto out;
53 case 0:
54 close(*master);
55
56 setsid();
57 if (ioctl(slave, TIOCSCTTY, NULL) == -1)
58 fatal("ioctl failed");
59
60 if (tio != NULL && tcsetattr(slave, TCSAFLUSH, tio) == -1)
61 fatal("tcsetattr failed");
62 if (ioctl(slave, TIOCSWINSZ, ws) == -1)
63 fatal("ioctl failed");
64
65 dup2(slave, 0);
66 dup2(slave, 1);
67 dup2(slave, 2);
68 if (slave > 2)
69 close(slave);
70 return (0);
71 }
72
73 close(slave);
74 return (pid);
75
76 out:
77 if (*master != -1)
78 close(*master);
79 if (slave != -1)
80 close(slave);
81 return (-1);
82 }
83