commands/simple/update.c

   1 /* update - do sync periodically                Author: Andy Tanenbaum */
   2
   3 #include <sys/types.h>
   4 #include <signal.h>
   5 #include <unistd.h>
   6
   7 _PROTOTYPE(int main, (void));
   8
   9 int main()
  10 {
  11   /* Release all (?) open file descriptors. */
  12   close(0);
  13   close(1);
  14   close(2);
  15
  16   /* Release current directory to avoid locking current device. */
  17   chdir("/");
  18
  19   /* Flush the cache every 30 seconds. */
  20   while (1) {
  21         sync();
  22         sleep(30);
  23   }
  24 }