source: branches/3.2/mindi-busybox/miscutils/readahead.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 1.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * readahead implementation for busybox
4 *
5 * Preloads the given files in RAM, to reduce access time.
6 * Does this by calling the readahead(2) system call.
7 *
8 * Copyright (C) 2006  Michael Opdenacker <michael@free-electrons.com>
9 *
10 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 */
12
13//usage:#define readahead_trivial_usage
14//usage:       "[FILE]..."
15//usage:#define readahead_full_usage "\n\n"
16//usage:       "Preload FILEs to RAM"
17
18#include "libbb.h"
19
20int readahead_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
21int readahead_main(int argc UNUSED_PARAM, char **argv)
22{
23    int retval = EXIT_SUCCESS;
24
25    if (!argv[1]) {
26        bb_show_usage();
27    }
28
29    while (*++argv) {
30        int fd = open_or_warn(*argv, O_RDONLY);
31        if (fd >= 0) {
32            off_t len;
33            int r;
34
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);
39            close(fd);
40            if (r >= 0)
41                continue;
42        }
43        retval = EXIT_FAILURE;
44    }
45
46    return retval;
47}
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