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
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9 * notice, this list of conditions and the following disclaimer.
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11 * notice, this list of conditions and the following disclaimer in the
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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
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30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)pty.c 8.3 (Berkeley) 5/16/94";
37 #endif /* LIBC_SCCS and not lint */
39 #include <sys/types.h>
40 #include <sys/ioctl.h>
55 new_openpty(int *amaster, int *aslave, char *name, struct termios *termp,
60 master = posix_openpt(O_RDWR);
64 if (grantpt(master) == -1) {
69 slave = open(ptsname(master), O_RDWR);
75 if (unlockpt(master) == -1) {
85 strcpy(name, ptsname(master));
87 tcsetattr(slave, TCSAFLUSH, termp);
89 ioctl(slave, TIOCSWINSZ, (char *)winp);
95 openpty(int *amaster, int *aslave, char *name, struct termios *termp, struct winsize *winp)
97 char line[] = "/dev/ptyXX";
98 const char *cp1, *cp2;
99 int master, slave, ttygid;
103 return (new_openpty(amaster, aslave, name, termp, winp));
105 if ((gr = getgrnam("tty")) != NULL)
110 for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
112 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
115 if ((master = open(line, O_RDWR, 0)) == -1) {
117 break; /* try the next pty group */
120 (void) chown(line, getuid(), ttygid);
121 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
123 if ((slave = open(line, O_RDWR, 0)) != -1) {
129 (void) tcsetattr(slave,
132 (void) ioctl(slave, TIOCSWINSZ,
136 (void) close(master);
140 errno = ENOENT; /* out of ptys */
145 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
147 int master, slave, pid;
149 if (openpty(&master, &slave, name, termp, winp) == -1)
151 switch (pid = fork()) {
158 (void) close(master);