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

int
main(int argc, char **argv)
{
    char *file = NULL;
    int fd = -1;
    char *buffer = NULL;
    size_t buf_size = 0;
    size_t written = 0;
    int ret = 0;
    off_t offset = 0;
    int i = 0;
    int loop_count = 5;

    if (argc < 2) {
        printf("Usage:%s <filename>\n", argv[0]);
        return -1;
    }

    file = argv[1];
    buf_size = 1024;
    buffer = malloc(buf_size);
    if (!buffer) {
        perror("malloc");
        return -1;
    }
    memset(buffer, 'R', buf_size);

    fd = open(file, O_WRONLY);
    if (fd == -1) {
        perror("open");
        return -1;
    }

    for (i = 0; i < loop_count; i++) {
        ret = write(fd, buffer, buf_size);
        if (ret == -1) {
            perror("write");
            return ret;
        } else {
            written += ret;
        }
        offset = lseek(fd, 0, SEEK_SET);
    }

    free(buffer);
    return 0;
}