busybox/miscutils/readahead.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 = fopen_or_warn(*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;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* readahead implementation for busybox
4	*
5	* Preloads the given files in RAM, to reduce access time.
6	* Does this by calling the readahead(2) system call.
7	*
8	* Copyright (C) 2006 Michael Opdenacker <michael@free-electrons.com>
9	*
10	* Licensed under GPLv2 or later, see file License in this tarball for details.
11	*/
12
13	#include "busybox.h"
14
15	int readahead_main(int argc, char **argv)
16	{
17	FILE *f;
18	int retval = EXIT_SUCCESS;
19
20	if (argc == 1) bb_show_usage();
21
22	while (*++argv) {
23	if ((f = fopen_or_warn(*argv, "r")) != NULL) {
24	int r, fd=fileno(f);
25
26	r = readahead(fd, 0, fdlength(fd));
27	fclose(f);
28	if (r >= 0) continue;
29	}
30	retval = EXIT_FAILURE;
31	}
32
33	return retval;
34	}