src/misc/openpty.c

   1 #include <stdlib.h>
   2 #include <fcntl.h>
   3 #include <unistd.h>
   4 #include <pty.h>
   5 #include <stdio.h>
   6 #include <pthread.h>
   7
   8 /* Nonstandard, but vastly superior to the standard functions */
   9
  10 int openpty(int *pm, int *ps, char *name, const struct termios *tio, const struct winsize *ws)
  11 {
  12         int m, s, n=0, cs;
  13         char buf[20];
  14
  15         m = open("/dev/ptmx", O_RDWR|O_NOCTTY);
  16         if (m < 0) return -1;
  17
  18         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
  19
  20         if (ioctl(m, TIOCSPTLCK, &n) || ioctl (m, TIOCGPTN, &n))
  21                 goto fail;
  22
  23         if (!name) name = buf;
  24         snprintf(name, sizeof buf, "/dev/pts/%d", n);
  25         if ((s = open(name, O_RDWR|O_NOCTTY)) < 0)
  26                 goto fail;
  27
  28         if (tio) tcsetattr(s, TCSANOW, tio);
  29         if (ws) ioctl(s, TIOCSWINSZ, ws);
  30
  31         *pm = m;
  32         *ps = s;
  33
  34         pthread_setcancelstate(cs, 0);
  35         return 0;
  36 fail:
  37         close(m);
  38         pthread_setcancelstate(cs, 0);
  39         return -1;
  40 }