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34 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "@(#)pty.c 8.3 (Berkeley) 5/16/94";
38 static const char rcsid[] =
39 "$FreeBSD: src/lib/libutil/pty.c,v 1.10 1999/08/28 00:05:51 peter Exp $";
41 #endif /* LIBC_SCCS and not lint */
43 #include <sys/types.h>
44 #include <sys/ioctl.h>
57 openpty(amaster, aslave, name, termp, winp)
58 int *amaster, *aslave;
60 struct termios *termp;
63 char line[] = "/dev/ptyXX";
64 register const char *cp1, *cp2;
65 register int master, slave, ttygid;
68 if ((gr = getgrnam("tty")) != NULL)
73 for (cp1 = "pqrsPQRS"; *cp1; cp1++) {
75 for (cp2 = "0123456789abcdefghijklmnopqrstuv"; *cp2; cp2++) {
78 if ((master = open(line, O_RDWR, 0)) == -1) {
80 return (-1); /* out of ptys */
83 (void) chown(line, getuid(), ttygid);
84 (void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
86 if ((slave = open(line, O_RDWR, 0)) != -1) {
92 (void) tcsetattr(slave,
95 (void) ioctl(slave, TIOCSWINSZ,
103 errno = ENOENT; /* out of ptys */
108 forkpty(amaster, name, termp, winp)
111 struct termios *termp;
112 struct winsize *winp;
114 int master, slave, pid;
116 if (openpty(&master, &slave, name, termp, winp) == -1)
118 switch (pid = fork()) {
125 (void) close(master);