Last change
on this file since 3832 was 3232, checked in by Bruno Cornec, 11 years ago |
- Update mindi-busybox to 1.21.1
|
-
Property svn:eol-style
set to
native
|
File size:
1.0 KB
|
Rev | Line | |
---|
[1765] | 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 | *
|
---|
[2725] | 10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
[1765] | 11 | */
|
---|
| 12 |
|
---|
[3232] | 13 | //usage:#define readahead_trivial_usage
|
---|
| 14 | //usage: "[FILE]..."
|
---|
| 15 | //usage:#define readahead_full_usage "\n\n"
|
---|
| 16 | //usage: "Preload FILEs to RAM"
|
---|
| 17 |
|
---|
[1765] | 18 | #include "libbb.h"
|
---|
| 19 |
|
---|
[2725] | 20 | int readahead_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 21 | int readahead_main(int argc UNUSED_PARAM, char **argv)
|
---|
[1765] | 22 | {
|
---|
| 23 | int retval = EXIT_SUCCESS;
|
---|
| 24 |
|
---|
[2725] | 25 | if (!argv[1]) {
|
---|
| 26 | bb_show_usage();
|
---|
| 27 | }
|
---|
[1765] | 28 |
|
---|
| 29 | while (*++argv) {
|
---|
[2725] | 30 | int fd = open_or_warn(*argv, O_RDONLY);
|
---|
| 31 | if (fd >= 0) {
|
---|
| 32 | off_t len;
|
---|
| 33 | int r;
|
---|
[1765] | 34 |
|
---|
[2725] | 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;
|
---|
[1765] | 42 | }
|
---|
| 43 | retval = EXIT_FAILURE;
|
---|
| 44 | }
|
---|
| 45 |
|
---|
| 46 | return retval;
|
---|
| 47 | }
|
---|
Note:
See
TracBrowser
for help on using the repository browser.