Contents of /tags/mkinitrd-6_3_4/busybox/miscutils/readahead.c
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Thu Dec 16 01:27:43 2010 UTC (13 years, 9 months ago) by niro
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Thu Dec 16 01:27:43 2010 UTC (13 years, 9 months ago) by niro
File MIME type: text/plain
File size: 907 byte(s)
tagged 'mkinitrd-6_3_4'
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 tarball for details. |
11 | */ |
12 | |
13 | #include "libbb.h" |
14 | |
15 | int readahead_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
16 | int readahead_main(int argc UNUSED_PARAM, char **argv) |
17 | { |
18 | int retval = EXIT_SUCCESS; |
19 | |
20 | if (!argv[1]) { |
21 | bb_show_usage(); |
22 | } |
23 | |
24 | while (*++argv) { |
25 | int fd = open_or_warn(*argv, O_RDONLY); |
26 | if (fd >= 0) { |
27 | off_t len; |
28 | int r; |
29 | |
30 | /* fdlength was reported to be unreliable - use seek */ |
31 | len = xlseek(fd, 0, SEEK_END); |
32 | xlseek(fd, 0, SEEK_SET); |
33 | r = readahead(fd, 0, len); |
34 | close(fd); |
35 | if (r >= 0) |
36 | continue; |
37 | } |
38 | retval = EXIT_FAILURE; |
39 | } |
40 | |
41 | return retval; |
42 | } |