35 lines
706 B
C
35 lines
706 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 "busybox.h"
|
||
|
|
|
||
|
|
int readahead_main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
FILE *f;
|
||
|
|
int retval = EXIT_SUCCESS;
|
||
|
|
|
||
|
|
if (argc == 1) bb_show_usage();
|
||
|
|
|
||
|
|
while (*++argv) {
|
||
|
|
if ((f = bb_wfopen(*argv, "r")) != NULL) {
|
||
|
|
int r, fd=fileno(f);
|
||
|
|
|
||
|
|
r = readahead(fd, 0, fdlength(fd));
|
||
|
|
fclose(f);
|
||
|
|
if (r >= 0) continue;
|
||
|
|
}
|
||
|
|
retval = EXIT_FAILURE;
|
||
|
|
}
|
||
|
|
|
||
|
|
return retval;
|
||
|
|
}
|