mirror of
https://github.com/sheumann/hush.git
synced 2024-11-05 06:07:00 +00:00
41 lines
888 B
C
41 lines
888 B
C
/* 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;
|
|
}
|