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author | Andreas Baumann <mail@andreasbaumann.cc> | 2015-01-03 13:58:15 +0100 |
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committer | Andreas Baumann <mail@andreasbaumann.cc> | 2015-01-03 13:58:15 +0100 |
commit | 4aca87515a5083ae0e31ce3177189fd43b6d05ac (patch) | |
tree | 7b1d9a31393ca090757dc6f0d3859b4fcd93f271 /release/src/router/busybox/miscutils/readahead.c | |
parent | 008d0be72b2f160382c6e880765e96b64a050c65 (diff) | |
download | tomato-4aca87515a5083ae0e31ce3177189fd43b6d05ac.tar.gz tomato-4aca87515a5083ae0e31ce3177189fd43b6d05ac.tar.bz2 |
patch to Vanilla Tomato 1.28
Diffstat (limited to 'release/src/router/busybox/miscutils/readahead.c')
-rw-r--r-- | release/src/router/busybox/miscutils/readahead.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/release/src/router/busybox/miscutils/readahead.c b/release/src/router/busybox/miscutils/readahead.c new file mode 100644 index 00000000..fb71ce85 --- /dev/null +++ b/release/src/router/busybox/miscutils/readahead.c @@ -0,0 +1,40 @@ +/* vi: set sw=4 ts=4: */ +/* + * readahead implementation for busybox + * + * Preloads the given files in RAM, to reduce access time. + * Does this by calling the readahead(2) system call. + * + * Copyright (C) 2006 Michael Opdenacker <michael@free-electrons.com> + * + * Licensed under GPLv2 or later, see file License in this tarball for details. + */ + +#include "libbb.h" + +int readahead_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int readahead_main(int argc, char **argv) +{ + int retval = EXIT_SUCCESS; + + if (argc == 1) bb_show_usage(); + + while (*++argv) { + int fd = open_or_warn(*argv, O_RDONLY); + if (fd >= 0) { + off_t len; + int r; + + /* fdlength was reported to be unreliable - use seek */ + len = xlseek(fd, 0, SEEK_END); + xlseek(fd, 0, SEEK_SET); + r = readahead(fd, 0, len); + close(fd); + if (r >= 0) + continue; + } + retval = EXIT_FAILURE; + } + + return retval; +} |