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29 * @(#)pty.c 8.3 (Berkeley) 5/16/94
30 * $FreeBSD: src/lib/libutil/pty.c,v 1.10 1999/08/28 00:05:51 peter Exp $
31 * $DragonFly: src/lib/libutil/pty.c,v 1.6 2007/12/30 13:44:33 matthias Exp $
34 #include <sys/types.h>
35 #include <sys/ioctl.h>
49 openpty(int *amaster, int *aslave, char *name, struct termios *termp,
52 char line[] = "/dev/ptyXX";
53 const char *cp1, *cp2;
54 int master, slave, ttygid;
57 if ((gr = getgrnam("tty")) != NULL)
62 for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
64 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
67 if ((master = open(line, O_RDWR, 0)) == -1) {
69 return (-1); /* out of ptys */
72 (void) chown(line, getuid(), ttygid);
73 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
75 if ((slave = open(line, O_RDWR, 0)) != -1) {
81 (void) tcsetattr(slave,
84 (void) ioctl(slave, TIOCSWINSZ,
92 errno = ENOENT; /* out of ptys */
97 forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
99 int master, slave, pid;
101 if (openpty(&master, &slave, name, termp, winp) == -1)
103 switch (pid = fork()) {
110 (void) close(master);