1#include <fcntl.h>
2#include <pty.h>
3#include <stdio.h>
4#include <stdlib.h>
5#include <unistd.h>
6
7/* Nonstandard, but vastly superior to the standard functions */
8
9int openpty(int* pm, int* ps, char* name, const struct termios* tio, const struct winsize* ws) {
10    int m, s, n = 0;
11    char buf[20];
12
13    m = open("/dev/ptmx", O_RDWR | O_NOCTTY);
14    if (m < 0)
15        return -1;
16
17    if (ioctl(m, TIOCSPTLCK, &n) || ioctl(m, TIOCGPTN, &n))
18        goto fail;
19
20    if (!name)
21        name = buf;
22    snprintf(name, sizeof buf, "/dev/pts/%d", n);
23    if ((s = open(name, O_RDWR | O_NOCTTY)) < 0)
24        goto fail;
25
26    if (tio)
27        tcsetattr(s, TCSANOW, tio);
28    if (ws)
29        ioctl(s, TIOCSWINSZ, ws);
30
31    *pm = m;
32    *ps = s;
33
34    return 0;
35fail:
36    close(m);
37    return -1;
38}
39