1/* See LICENSE file for copyright and license details. */
 2#include <unistd.h>
 3
 4#include "arg.h"
 5#include "util.h"
 6
 7// ?man sync: flush disk cache
 8// ?man synopsis:
 9// ?man The sync utility invokes sync(2) to flush all unwritten changes to disk.
10// This is usually done before shutting down, rebooting or halting. ?man ## SEE
11// ALSO ?man fsync(2), sync(2)
12
13static void
14usage(void)
15{
16  eprintf("usage: %s\n", argv0);
17}
18
19int
20main(int argc, char *argv[])
21{
22  ARGBEGIN
23  {
24    default:
25      usage();
26  }
27  ARGEND
28
29  if (argc)
30    usage();
31  sync();
32
33  return 0;
34}