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.
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.
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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>
59 new_openpty(int *amaster, int *aslave, char *name, struct termios *termp,
64 master = posix_openpt(O_RDWR);
68 if (grantpt(master) == -1) {
73 slave = open(ptsname(master), O_RDWR);
79 if (unlockpt(master) == -1) {
89 strcpy(name, ptsname(master));
91 tcsetattr(slave, TCSAFLUSH, termp);
93 ioctl(slave, TIOCSWINSZ, (char *)winp);
99 openpty(int *amaster, int *aslave, char *name, struct termios *termp, struct winsize *winp)
101 char line[] = "/dev/ptyXX";
102 const char *cp1, *cp2;
103 int master, slave, ttygid;
107 return (new_openpty(amaster, aslave, name, termp, winp));
109 if ((gr = getgrnam("tty")) != NULL)
114 for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
116 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
119 if ((master = open(line, O_RDWR, 0)) == -1) {
121 break; /* try the next pty group */
124 (void) chown(line, getuid(), ttygid);
125 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
127 if ((slave = open(line, O_RDWR, 0)) != -1) {
133 (void) tcsetattr(slave,
136 (void) ioctl(slave, TIOCSWINSZ,
140 (void) close(master);
144 errno = ENOENT; /* out of ptys */
149 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
151 int master, slave, pid;
153 if (openpty(&master, &slave, name, termp, winp) == -1)
155 switch (pid = fork()) {
162 (void) close(master);