src/tests/libs/bsd/forkpty.c

   1 /* from http://jwz.livejournal.com/817438.html */
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5 #include <pty.h>
   6
   7 static int
   8 do_fork(void)
   9 {
  10   int fd = -1;
  11   pid_t pid;
  12
  13   if ((pid = forkpty(&fd, NULL, NULL, NULL)) < 0)
  14     perror("forkpty");
  15   else if (!pid)
  16     {
  17       printf ("0123456789\n");
  18
  19       /* #### Uncommenting this makes it work! */
  20       /* sleep(20); */
  21
  22       exit (0);
  23     }
  24
  25   return fd;
  26 }
  27
  28
  29 int
  30 main (int argc, char **argv)
  31 {
  32   char s[1024];
  33   int n;
  34   int fd = do_fork();
  35
  36   /* On 10.4, this prints the whole 10 character line, 1 char per second.
  37      On 10.5, it prints 1 character and stops.
  38    */
  39   do {
  40     n = read (fd, s, 1);
  41     if (n > 0) fprintf (stderr, "%c", *s);
  42     sleep (1);
  43   } while (n > 0);
  44
  45   return 0;
  46 }
  47