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#define _LARGEFILE64_SOURCE#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <errno.h>#include <time.h>#include <signal.h>#include <sys/fcntl.h>#include <sys/ioctl.h>#include <linux/fs.h>#define BLOCKSIZE 512#define TIMEOUT 30int count;time_t start;void done(){	time_t end;	time(&end);	if (end < start + TIMEOUT) {		printf(".");		alarm(1);		return;	}	if (count) {	  printf(".\nResults: %d seeks/second, %.2f ms random access time\n",		 count / TIMEOUT, 1000.0 * TIMEOUT / count);	}	exit(EXIT_SUCCESS);}void handle(const char *string, int error){	if (error) {		perror(string);		exit(EXIT_FAILURE);	}}int main(int argc, char **argv){	char buffer[BLOCKSIZE];	int fd, retval;	unsigned long numblocks;	off64_t offset;	setvbuf(stdout, NULL, _IONBF, 0);	printf("Seeker v2.0, 2007-01-15, "	       "http://www.linuxinsight.com/how_fast_is_your_disk.html\n");	if (argc != 2) {		printf("Usage: seeker <raw disk device>\n");		exit(EXIT_SUCCESS);	}	fd = open(argv[1], O_RDONLY);	handle("open", fd < 0);	retval = ioctl(fd, BLKGETSIZE, &numblocks);	handle("ioctl", retval == -1);	printf("Benchmarking %s [%luMB], wait %d seconds",	       argv[1], numblocks / 2048, TIMEOUT);	time(&start);	srand(start);	signal(SIGALRM, &done);	alarm(1);	for (;;) {		offset = (off64_t) numblocks * random() / RAND_MAX;		retval = lseek64(fd, BLOCKSIZE * offset, SEEK_SET);		handle("lseek64", retval == (off64_t) -1);		retval = read(fd, buffer, BLOCKSIZE);		handle("read", retval < 0);		count++;	}	/* notreached */}