/*
 * DF-2675 sweep: pin self to <cpu>, then sequentially read the first 64K
 * of every file listed in <listfile>.  All buffer allocations (fresh file
 * data) happen on the pinned cpu.  Prints one line per file for progress.
 */
#include <sys/types.h>
#include <sys/usched.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int
main(int argc, char **argv)
{
	int cpu, fd, n = 0;
	char line[1024], *buf;
	FILE *list;

	if (argc != 3) {
		fprintf(stderr, "usage: sweep cpu listfile\n");
		return 1;
	}
	cpu = atoi(argv[1]);
	{
		int pin_cpu = cpu;
		if (usched_set(0, USCHED_SET_CPU, &pin_cpu, sizeof(pin_cpu)) < 0)
			err(1, "usched_set");
	}
	buf = malloc(65536);
	if (!buf) err(1, "malloc");
	list = fopen(argv[2], "r");
	if (!list) err(1, "fopen list");
	while (fgets(line, sizeof(line), list)) {
		size_t l = strlen(line);
		if (l && line[l-1] == '\n') line[l-1] = 0;
		if (line[0] != '/') continue;
		fd = open(line, O_RDONLY);
		if (fd < 0) continue;
		if (pread(fd, buf, 65536, 0) == 65536)
			++n;
		close(fd);
		printf("SWEPT %d %s\n", n, line);
		fflush(stdout);
	}
	fclose(list);
	return 0;
}