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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 1.5 2005/03/04 05:22:57 cpressey Exp $
38 #include <sys/types.h>
39 #include <sys/ioctl.h>
53 openpty(int *amaster, int *aslave, char *name, struct termios *termp,
56 char line[] = "/dev/ptyXX";
57 const char *cp1, *cp2;
58 int master, slave, ttygid;
61 if ((gr = getgrnam("tty")) != NULL)
66 for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
68 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
71 if ((master = open(line, O_RDWR, 0)) == -1) {
73 return (-1); /* out of ptys */
76 (void) chown(line, getuid(), ttygid);
77 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
79 if ((slave = open(line, O_RDWR, 0)) != -1) {
85 (void) tcsetattr(slave,
88 (void) ioctl(slave, TIOCSWINSZ,
96 errno = ENOENT; /* out of ptys */
101 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
103 int master, slave, pid;
105 if (openpty(&master, &slave, name, termp, winp) == -1)
107 switch (pid = fork()) {
114 (void) close(master);