blob: 596a2bcaf3cddf699df59e1daf9112892256fafa
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 | //config:config FSYNC |
10 | //config: bool "fsync" |
11 | //config: default y |
12 | //config: help |
13 | //config: fsync is used to flush file-related cached blocks to disk. |
14 | |
15 | //applet:IF_FSYNC(APPLET_NOFORK(fsync, fsync, BB_DIR_BIN, BB_SUID_DROP, fsync)) |
16 | |
17 | //kbuild:lib-$(CONFIG_FSYNC) += fsync.o |
18 | |
19 | //usage:#define fsync_trivial_usage |
20 | //usage: "[-d] FILE..." |
21 | //usage:#define fsync_full_usage "\n\n" |
22 | //usage: "Write files' buffered blocks to disk\n" |
23 | //usage: "\n -d Avoid syncing metadata" |
24 | |
25 | #include "libbb.h" |
26 | #ifndef O_NOATIME |
27 | # define O_NOATIME 0 |
28 | #endif |
29 | |
30 | /* This is a NOFORK applet. Be very careful! */ |
31 | |
32 | int fsync_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
33 | int fsync_main(int argc UNUSED_PARAM, char **argv) |
34 | { |
35 | int status; |
36 | int opts; |
37 | |
38 | opts = getopt32(argv, "d"); /* fdatasync */ |
39 | argv += optind; |
40 | if (!*argv) { |
41 | bb_show_usage(); |
42 | } |
43 | |
44 | status = EXIT_SUCCESS; |
45 | do { |
46 | int fd = open_or_warn(*argv, O_NOATIME | O_NOCTTY | O_RDONLY); |
47 | |
48 | if (fd == -1) { |
49 | status = EXIT_FAILURE; |
50 | continue; |
51 | } |
52 | if ((opts ? fdatasync(fd) : fsync(fd))) { |
53 | //status = EXIT_FAILURE; - do we want this? |
54 | bb_simple_perror_msg(*argv); |
55 | } |
56 | close(fd); |
57 | } while (*++argv); |
58 | |
59 | return status; |
60 | } |
61 |