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/* vi: set sw=4 ts=4: */
/*
* Mini fsync implementation for busybox
*
* Copyright (C) 2008 Nokia Corporation. All rights reserved.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config FSYNC
//config: bool "fsync (3.6 kb)"
//config: default y
//config: help
//config: fsync is used to flush file-related cached blocks to disk.
// APPLET_NOFORK:name main location suid_type help
//applet:IF_FSYNC(APPLET_NOFORK(fsync, fsync, BB_DIR_BIN, BB_SUID_DROP, fsync))
//kbuild:lib-$(CONFIG_FSYNC) += fsync.o
//usage:#define fsync_trivial_usage
//usage: "[-d] FILE..."
//usage:#define fsync_full_usage "\n\n"
//usage: "Write all buffered blocks in FILEs to disk\n"
//usage: "\n -d Avoid syncing metadata"
#include "libbb.h"
/* This is a NOFORK applet. Be very careful! */
int fsync_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fsync_main(int argc UNUSED_PARAM, char **argv)
{
int ret;
int opts;
opts = getopt32(argv, "d"); /* fdatasync */
argv += optind;
if (!*argv) {
bb_show_usage();
}
ret = EXIT_SUCCESS;
do {
/* GNU "sync FILE" uses O_NONBLOCK open */
int fd = open_or_warn(*argv, /*O_NOATIME |*/ O_NOCTTY | O_RDONLY | O_NONBLOCK);
/* open(NOATIME) can only be used by owner or root, don't use NOATIME here */
if (fd < 0) {
ret = EXIT_FAILURE;
goto next;
}
if ((opts ? fdatasync(fd) : fsync(fd)) != 0) {
bb_simple_perror_msg(*argv);
ret = EXIT_FAILURE;
}
close(fd);
next:
argv++;
} while (*argv);
return ret;
}
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