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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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.
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18 * may be used to endorse or promote products derived from this software
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34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #if defined(LIBC_SCCS) && !defined(lint)
39 static char sccsid[] = "@(#)pty.c 8.3 (Berkeley) 5/16/94";
41 #endif /* LIBC_SCCS and not lint */
43 #include <sys/types.h>
44 #include <sys/ioctl.h>
57 openpty(int *amaster, int *aslave, char *name, struct termios *termp, struct winsize *winp)
59 char line[] = "/dev/ptyXX";
60 const char *cp1, *cp2;
61 int master, slave, ttygid;
64 if ((gr = getgrnam("tty")) != NULL)
69 for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
71 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
74 if ((master = open(line, O_RDWR, 0)) == -1) {
76 break; /* try the next pty group */
79 (void) chown(line, getuid(), ttygid);
80 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
82 if ((slave = open(line, O_RDWR, 0)) != -1) {
88 (void) tcsetattr(slave,
91 (void) ioctl(slave, TIOCSWINSZ,
99 errno = ENOENT; /* out of ptys */
104 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
106 int master, slave, pid;
108 if (openpty(&master, &slave, name, termp, winp) == -1)
110 switch (pid = fork()) {
117 (void) close(master);