Last change
on this file since 3268 was 3232, checked in by Bruno Cornec, 11 years ago |
- Update mindi-busybox to 1.21.1
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-
Property svn:eol-style
set to
native
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File size:
1.0 KB
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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * readahead implementation for busybox
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4 | *
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5 | * Preloads the given files in RAM, to reduce access time.
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6 | * Does this by calling the readahead(2) system call.
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7 | *
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8 | * Copyright (C) 2006 Michael Opdenacker <michael@free-electrons.com>
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9 | *
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10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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11 | */
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12 |
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13 | //usage:#define readahead_trivial_usage
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14 | //usage: "[FILE]..."
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15 | //usage:#define readahead_full_usage "\n\n"
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16 | //usage: "Preload FILEs to RAM"
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17 |
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18 | #include "libbb.h"
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19 |
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20 | int readahead_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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21 | int readahead_main(int argc UNUSED_PARAM, char **argv)
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22 | {
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23 | int retval = EXIT_SUCCESS;
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24 |
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25 | if (!argv[1]) {
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26 | bb_show_usage();
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27 | }
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28 |
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29 | while (*++argv) {
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30 | int fd = open_or_warn(*argv, O_RDONLY);
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31 | if (fd >= 0) {
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32 | off_t len;
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33 | int r;
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34 |
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35 | /* fdlength was reported to be unreliable - use seek */
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36 | len = xlseek(fd, 0, SEEK_END);
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37 | xlseek(fd, 0, SEEK_SET);
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38 | r = readahead(fd, 0, len);
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39 | close(fd);
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40 | if (r >= 0)
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41 | continue;
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42 | }
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43 | retval = EXIT_FAILURE;
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44 | }
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45 |
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46 | return retval;
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47 | }
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