Fix typo.
[dragonfly.git] / lib / libutil / pty.c
blob0186354e7eade87d12f42b7d5cc3386ae06bca22
1 /*-
2 * Copyright (c) 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
29 * @(#)pty.c 8.3 (Berkeley) 5/16/94
30 * $FreeBSD: src/lib/libutil/pty.c,v 1.10 1999/08/28 00:05:51 peter Exp $
31 * $DragonFly: src/lib/libutil/pty.c,v 1.6 2007/12/30 13:44:33 matthias Exp $
34 #include <sys/types.h>
35 #include <sys/ioctl.h>
36 #include <sys/stat.h>
38 #include <errno.h>
39 #include <fcntl.h>
40 #include <grp.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <termios.h>
44 #include <unistd.h>
46 #include "libutil.h"
48 int
49 openpty(int *amaster, int *aslave, char *name, struct termios *termp,
50 struct winsize *winp)
52 char line[] = "/dev/ptyXX";
53 const char *cp1, *cp2;
54 int master, slave, ttygid;
55 struct group *gr;
57 if ((gr = getgrnam("tty")) != NULL)
58 ttygid = gr->gr_gid;
59 else
60 ttygid = -1;
62 for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
63 line[8] = *cp1;
64 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
65 line[5] = 'p';
66 line[9] = *cp2;
67 if ((master = open(line, O_RDWR, 0)) == -1) {
68 if (errno == ENOENT)
69 return (-1); /* out of ptys */
70 } else {
71 line[5] = 't';
72 (void) chown(line, getuid(), ttygid);
73 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
74 (void) revoke(line);
75 if ((slave = open(line, O_RDWR, 0)) != -1) {
76 *amaster = master;
77 *aslave = slave;
78 if (name)
79 strcpy(name, line);
80 if (termp)
81 (void) tcsetattr(slave,
82 TCSAFLUSH, termp);
83 if (winp)
84 (void) ioctl(slave, TIOCSWINSZ,
85 (char *)winp);
86 return (0);
88 (void) close(master);
92 errno = ENOENT; /* out of ptys */
93 return (-1);
96 int
97 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
99 int master, slave, pid;
101 if (openpty(&master, &slave, name, termp, winp) == -1)
102 return (-1);
103 switch (pid = fork()) {
104 case -1:
105 return (-1);
106 case 0:
108 * child
110 (void) close(master);
111 login_tty(slave);
112 return (0);
115 * parent
117 *amaster = master;
118 (void) close(slave);
119 return (pid);