release/src/router/busybox/coreutils/fsync.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini fsync implementation for busybox
   4  *
   5  * Copyright (C) 2008 Nokia Corporation. All rights reserved.
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9
  10 //usage:#define fsync_trivial_usage
  11 //usage:       "[-d] FILE..."
  12 //usage:#define fsync_full_usage "\n\n"
  13 //usage:       "Write files' buffered blocks to disk\n"
  14 //usage:     "\n        -d      Avoid syncing metadata"
  15
  16 #include "libbb.h"
  17 #ifndef O_NOATIME
  18 # define O_NOATIME 0
  19 #endif
  20
  21 /* This is a NOFORK applet. Be very careful! */
  22
  23 int fsync_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  24 int fsync_main(int argc UNUSED_PARAM, char **argv)
  25 {
  26         int status;
  27         int opts;
  28
  29         opts = getopt32(argv, "d"); /* fdatasync */
  30         argv += optind;
  31         if (!*argv) {
  32                 bb_show_usage();
  33         }
  34
  35         status = EXIT_SUCCESS;
  36         do {
  37                 int fd = open_or_warn(*argv, O_NOATIME | O_NOCTTY | O_RDONLY);
  38
  39                 if (fd == -1) {
  40                         status = EXIT_FAILURE;
  41                         continue;
  42                 }
  43                 if ((opts ? fdatasync(fd) : fsync(fd))) {
  44                         //status = EXIT_FAILURE; - do we want this?
  45                         bb_simple_perror_msg(*argv);
  46                 }
  47                 close(fd);
  48         } while (*++argv);
  49
  50         return status;
  51 }