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15637ed4 RG |
1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
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. | |
20 | * | |
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. | |
32 | */ | |
33 | ||
34 | #if defined(LIBC_SCCS) && !defined(lint) | |
35 | static char sccsid[] = "@(#)pty.c 5.6 (Berkeley) 5/10/91"; | |
36 | #endif /* LIBC_SCCS and not lint */ | |
37 | ||
38 | #include <sys/cdefs.h> | |
39 | #include <sys/types.h> | |
40 | #include <sys/stat.h> | |
41 | #include <sys/ioctl.h> | |
42 | #include <fcntl.h> | |
43 | #include <termios.h> | |
44 | #include <errno.h> | |
45 | #include <unistd.h> | |
46 | #include <stdio.h> | |
47 | #include <string.h> | |
48 | #include <grp.h> | |
49 | ||
50 | openpty(amaster, aslave, name, termp, winp) | |
51 | int *amaster, *aslave; | |
52 | char *name; | |
53 | struct termios *termp; | |
54 | struct winsize *winp; | |
55 | { | |
56 | static char line[] = "/dev/ptyXX"; | |
57 | register const char *cp1, *cp2; | |
58 | register int master, slave, ttygid; | |
59 | struct group *gr; | |
60 | ||
61 | if ((gr = getgrnam("tty")) != NULL) | |
62 | ttygid = gr->gr_gid; | |
63 | else | |
64 | ttygid = -1; | |
65 | ||
66 | for (cp1 = "pqrs"; *cp1; cp1++) { | |
67 | line[8] = *cp1; | |
68 | for (cp2 = "0123456789abcdef"; *cp2; cp2++) { | |
69 | line[9] = *cp2; | |
70 | if ((master = open(line, O_RDWR, 0)) == -1) { | |
71 | if (errno == ENOENT) | |
72 | return (-1); /* out of ptys */ | |
73 | } else { | |
74 | line[5] = 't'; | |
75 | (void) chown(line, getuid(), ttygid); | |
76 | (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP); | |
77 | (void) revoke(line); | |
78 | if ((slave = open(line, O_RDWR, 0)) != -1) { | |
79 | *amaster = master; | |
80 | *aslave = slave; | |
81 | if (name) | |
82 | strcpy(name, line); | |
83 | if (termp) | |
84 | (void) tcsetattr(slave, | |
85 | TCSAFLUSH, termp); | |
86 | if (winp) | |
87 | (void) ioctl(slave, TIOCSWINSZ, | |
88 | (char *)winp); | |
89 | return (0); | |
90 | } | |
91 | (void) close(master); | |
92 | line[5] = 'p'; | |
93 | } | |
94 | } | |
95 | } | |
96 | errno = ENOENT; /* out of ptys */ | |
97 | return (-1); | |
98 | } | |
99 | ||
100 | forkpty(amaster, name, termp, winp) | |
101 | int *amaster; | |
102 | char *name; | |
103 | struct termios *termp; | |
104 | struct winsize *winp; | |
105 | { | |
106 | int master, slave, pid; | |
107 | ||
108 | if (openpty(&master, &slave, name, termp, winp) == -1) | |
109 | return (-1); | |
110 | switch (pid = fork()) { | |
111 | case -1: | |
112 | return (-1); | |
113 | case 0: | |
114 | /* | |
115 | * child | |
116 | */ | |
117 | (void) close(master); | |
118 | login_tty(slave); | |
119 | return (0); | |
120 | } | |
121 | /* | |
122 | * parent | |
123 | */ | |
124 | *amaster = master; | |
125 | (void) close(slave); | |
126 | return (pid); | |
127 | } |