#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(int argc, char **argv)
{
    int i, fd;
    time_t ts;
    char *fakebuf;

    if (argc < 2)
        exit(1);

    fd = open(argv[1], O_RDWR|O_CREAT|O_EXCL|O_TRUNC|O_NOFOLLOW, 0755);
    if (fd < 0) {
        perror("open");
        exit(1);
    }

    fakebuf = malloc(256*1024);
    if (fakebuf == NULL) {
        perror("malloc");
        exit(1);
    }

    ts = time(NULL);
    printf("writing..");
    memset(fakebuf, 'A', 256*1024);
    for (i = 0; i < 68; i++)
        write(fd, fakebuf, 256*1024);
    printf("done in %lu secs\n", time(NULL) - ts);

    ts = time(NULL);
    printf("not syncing..");
    // fsync(fd);
    printf("synced in %lu secs\n", time(NULL) - ts);

    printf("reading..");

    ts = time(NULL);
    if (fd < 0) {
        perror("open");
        exit(1);
    }

    // just mimic mysql stuff
    lseek(fd, 0, SEEK_CUR);
    lseek(fd, 0, SEEK_END);
    lseek(fd, 0, SEEK_SET);
    for (i = 0; i < 68; i++)
        read(fd, fakebuf, 256*1024);
    printf("done in %lu secs\n", time(NULL) - ts);

    return 0;
}