1 /* vi: set sw=4 ts=4: */
3 * readahead implementation for busybox
5 * Preloads the given files in RAM, to reduce access time.
6 * Does this by calling the readahead(2) system call.
8 * Copyright (C) 2006 Michael Opdenacker <michael@free-electrons.com>
10 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
13 //usage:#define readahead_trivial_usage
15 //usage:#define readahead_full_usage "\n\n"
16 //usage: "Preload FILEs to RAM"
20 int readahead_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
21 int readahead_main(int argc UNUSED_PARAM, char **argv)
23 int retval = EXIT_SUCCESS;
30 int fd = open_or_warn(*argv, O_RDONLY);
35 /* fdlength was reported to be unreliable - use seek */
36 len = xlseek(fd, 0, SEEK_END);
37 xlseek(fd, 0, SEEK_SET);
38 r = readahead(fd, 0, len);
43 retval = EXIT_FAILURE;