commands/simple/sleep.c

   1 /* sleep - suspend a process for x sec          Author: Andy Tanenbaum */
   2
   3 #include <sys/types.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include <minix/minlib.h>
   7
   8 _PROTOTYPE(int main, (int argc, char **argv));
   9
  10 int main(argc, argv)
  11 int argc;
  12 char *argv[];
  13 {
  14   register seconds;
  15   register char c;
  16
  17   seconds = 0;
  18
  19   if (argc != 2) {
  20         std_err("Usage: sleep time\n");
  21         exit(1);
  22   }
  23   while (c = *(argv[1])++) {
  24         if (c < '0' || c > '9') {
  25                 std_err("sleep: bad arg\n");
  26                 exit(1);
  27         }
  28         seconds = 10 * seconds + (c - '0');
  29   }
  30
  31   /* Now sleep. */
  32   sleep(seconds);
  33   return(0);
  34 }