From 0e4690d4ef9fe55ccf6db371c826112809e162f9 Mon Sep 17 00:00:00 2001 From: Rob Landley Date: Sun, 20 Aug 2006 22:12:18 +0000 Subject: Michael Opdenacker contributed a readahead applet. --- miscutils/readahead.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 miscutils/readahead.c (limited to 'miscutils/readahead.c') diff --git a/miscutils/readahead.c b/miscutils/readahead.c new file mode 100644 index 000000000..9f1bb47be --- /dev/null +++ b/miscutils/readahead.c @@ -0,0 +1,36 @@ +/* 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 "busybox.h" + +int readahead_main(int argc, char **argv) +{ + FILE *f; + struct stat stat_buf; + int retval = EXIT_SUCCESS; + + if (argc == 1) bb_show_usage(); + + while (*++argv) { + if ((f = bb_wfopen(*argv, "r")) != NULL) { + int r, fd=fileno(f); + + xstat(*argv, &stat_buf); + r = readahead(fd, 0, fdlength(fd)); + fclose(f); + if (r >= 0) continue; + } + retval = EXIT_FAILURE; + } + + return retval; +} -- cgit v1.2.3