src/examples/recursor.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <syscall.h>
   4
   5 int
   6 main (int argc, char *argv[])
   7 {
   8   char buffer[128];
   9   pid_t pid;
  10   int retval = 0;
  11
  12   if (argc != 4)
  13     {
  14       printf ("usage: recursor <string> <depth> <waitp>\n");
  15       exit (1);
  16     }
  17
  18   /* Print args. */
  19   printf ("%s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]);
  20
  21   /* Execute child and wait for it to finish if requested. */
  22   if (atoi (argv[2]) != 0)
  23     {
  24       snprintf (buffer, sizeof buffer,
  25                 "recursor %s %d %s", argv[1], atoi (argv[2]) - 1, argv[3]);
  26       pid = exec (buffer);
  27       if (atoi (argv[3]))
  28         retval = wait (pid);
  29     }
  30
  31   /* Done. */
  32   printf ("%s %s: dying, retval=%d\n", argv[1], argv[2], retval);
  33   exit (retval);
  34 }