From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 3 Jan 2015 13:58:15 +0100 Subject: patch to Vanilla Tomato 1.28 --- release/src/router/busybox/miscutils/readahead.c | 40 ++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 release/src/router/busybox/miscutils/readahead.c (limited to 'release/src/router/busybox/miscutils/readahead.c') 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 + * + * 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; +} -- cgit v1.2.3-54-g00ecf