blob: 1a5aae55eeebb6afc61537b36c3fab0c755196cd
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Mini sync implementation for busybox |
| 4 | * |
| 5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. |
| 6 | * Copyright (C) 2015 by Ari Sundholm <ari@tuxera.com> |
| 7 | * |
| 8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 9 | */ |
| 10 | //config:config SYNC |
| 11 | //config: bool "sync" |
| 12 | //config: default y |
| 13 | //config: help |
| 14 | //config: sync is used to flush filesystem buffers. |
| 15 | //config:config FEATURE_SYNC_FANCY |
| 16 | //config: bool "Enable -d and -f flags (requires syncfs(2) in libc)" |
| 17 | //config: default y |
| 18 | //config: depends on SYNC |
| 19 | //config: help |
| 20 | //config: sync -d FILE... executes fdatasync() on each FILE. |
| 21 | //config: sync -f FILE... executes syncfs() on each FILE. |
| 22 | |
| 23 | //applet:IF_SYNC(APPLET_NOFORK(sync, sync, BB_DIR_BIN, BB_SUID_DROP, sync)) |
| 24 | |
| 25 | //kbuild:lib-$(CONFIG_SYNC) += sync.o |
| 26 | |
| 27 | /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */ |
| 28 | |
| 29 | //usage:#define sync_trivial_usage |
| 30 | //usage: ""IF_FEATURE_SYNC_FANCY("[-df] [FILE]...") |
| 31 | //usage:#define sync_full_usage "\n\n" |
| 32 | //usage: IF_NOT_FEATURE_SYNC_FANCY( |
| 33 | //usage: "Write all buffered blocks to disk" |
| 34 | //usage: ) |
| 35 | //usage: IF_FEATURE_SYNC_FANCY( |
| 36 | //usage: "Write all buffered blocks (in FILEs) to disk" |
| 37 | //usage: "\n -d Avoid syncing metadata" |
| 38 | //usage: "\n -f Sync filesystems underlying FILEs" |
| 39 | //usage: ) |
| 40 | |
| 41 | #include "libbb.h" |
| 42 | |
| 43 | /* This is a NOFORK applet. Be very careful! */ |
| 44 | |
| 45 | int sync_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 46 | int sync_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM)) |
| 47 | { |
| 48 | /* coreutils-6.9 compat */ |
| 49 | bb_warn_ignoring_args(argv[1]); |
| 50 | |
| 51 | sync(); |
| 52 | |
| 53 | return EXIT_SUCCESS; |
| 54 | } |
| 55 |