#include <ftw.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <dlfcn.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <aio.h>


int main(int argc, char *argv[])
{

    if (argc != 3)
    {
        printf("netinkamas argumentu kiekis");
        exit(255);
    }
    int number = atoi(argv[2]);
    if (number < 0)
    {
        printf("Skaicius turi buti teigiamas\n");
        exit(254);
    }

    int fd = open(argv[1], O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
    if (fd < 0) {
      if (errno == EEXIST)
      {
        printf("Failas jau yra.\n");
        exit(254);
      }
    }
    else
    {
        #define BUF_SIZE number*1024*1024
        char buf[BUF_SIZE];
        struct aiocb aiocb;
        memset(buf, 0xAA, BUF_SIZE);
        memset(&aiocb, 0, sizeof(struct aiocb));
        aiocb.aio_fildes = fd;
        aiocb.aio_buf = buf;
        aiocb.aio_nbytes = BUF_SIZE;
        aio_write(&aiocb);
        while (aio_error (&aiocb) == EINPROGRESS);
        close(fd);
    }

    return 0;
}