Spelling fix.
[dragonfly.git] / lib / libutil / pty.c
blob93ec275f74c23c29942eeb2f698174aff3bb2889
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
33 * @(#)pty.c 8.3 (Berkeley) 5/16/94
34 * $FreeBSD: src/lib/libutil/pty.c,v 1.10 1999/08/28 00:05:51 peter Exp $
35 * $DragonFly: src/lib/libutil/pty.c,v 1.5 2005/03/04 05:22:57 cpressey Exp $
38 #include <sys/types.h>
39 #include <sys/ioctl.h>
40 #include <sys/stat.h>
42 #include <errno.h>
43 #include <fcntl.h>
44 #include <grp.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <termios.h>
48 #include <unistd.h>
50 #include "libutil.h"
52 int
53 openpty(int *amaster, int *aslave, char *name, struct termios *termp,
54 struct winsize *winp)
56 char line[] = "/dev/ptyXX";
57 const char *cp1, *cp2;
58 int master, slave, ttygid;
59 struct group *gr;
61 if ((gr = getgrnam("tty")) != NULL)
62 ttygid = gr->gr_gid;
63 else
64 ttygid = -1;
66 for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
67 line[8] = *cp1;
68 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
69 line[5] = 'p';
70 line[9] = *cp2;
71 if ((master = open(line, O_RDWR, 0)) == -1) {
72 if (errno == ENOENT)
73 return (-1); /* out of ptys */
74 } else {
75 line[5] = 't';
76 (void) chown(line, getuid(), ttygid);
77 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
78 (void) revoke(line);
79 if ((slave = open(line, O_RDWR, 0)) != -1) {
80 *amaster = master;
81 *aslave = slave;
82 if (name)
83 strcpy(name, line);
84 if (termp)
85 (void) tcsetattr(slave,
86 TCSAFLUSH, termp);
87 if (winp)
88 (void) ioctl(slave, TIOCSWINSZ,
89 (char *)winp);
90 return (0);
92 (void) close(master);
96 errno = ENOENT; /* out of ptys */
97 return (-1);
101 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
103 int master, slave, pid;
105 if (openpty(&master, &slave, name, termp, winp) == -1)
106 return (-1);
107 switch (pid = fork()) {
108 case -1:
109 return (-1);
110 case 0:
112 * child
114 (void) close(master);
115 login_tty(slave);
116 return (0);
119 * parent
121 *amaster = master;
122 (void) close(slave);
123 return (pid);