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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 1.2 2003/06/17 04:26:52 dillon Exp $
38 #include <sys/types.h>
39 #include <sys/ioctl.h>
52 openpty(amaster, aslave, name, termp, winp)
53 int *amaster, *aslave;
55 struct termios *termp;
58 char line[] = "/dev/ptyXX";
59 register const char *cp1, *cp2;
60 register int master, slave, ttygid;
63 if ((gr = getgrnam("tty")) != NULL)
68 for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
70 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
73 if ((master = open(line, O_RDWR, 0)) == -1) {
75 return (-1); /* out of ptys */
78 (void) chown(line, getuid(), ttygid);
79 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
81 if ((slave = open(line, O_RDWR, 0)) != -1) {
87 (void) tcsetattr(slave,
90 (void) ioctl(slave, TIOCSWINSZ,
98 errno = ENOENT; /* out of ptys */
103 forkpty(amaster, name, termp, winp)
106 struct termios *termp;
107 struct winsize *winp;
109 int master, slave, pid;
111 if (openpty(&master, &slave, name, termp, winp) == -1)
113 switch (pid = fork()) {
120 (void) close(master);