Last change
on this file since 3858 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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Rev | Line | |
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[1765] | 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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[2725] | 10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[1765] | 11 | */
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| 12 |
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[3232] | 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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[1765] | 18 | #include "libbb.h"
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| 19 |
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[2725] | 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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[1765] | 22 | {
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| 23 | int retval = EXIT_SUCCESS;
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| 24 |
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[2725] | 25 | if (!argv[1]) {
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| 26 | bb_show_usage();
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| 27 | }
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[1765] | 28 |
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| 29 | while (*++argv) {
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[2725] | 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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[1765] | 34 |
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[2725] | 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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[1765] | 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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