#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include<stdlib.h>  
#include <assert.h>
#include <time.h>
#define RETRY 1
#define OK 0
#define FAIL -1

#define BUF_SIZE 1024
int do_api_write_direct()
{
    int fd, wfd;
    int ret,wret;
    unsigned char *buf;
    char origfilePath[128] = "/tmp/nmzfs-orig/write.txt";
    char filePath[128] = "/tmp/nmzfs-mnt/write.txt";
    
    ret = posix_memalign((void **)&buf, 512, BUF_SIZE);
    if (ret) {
        perror("posix_memalign failed");
        exit(1);
    }
    memset(buf, 'c', BUF_SIZE);

    while(1){
        wfd = open(filePath, O_WRONLY | O_DIRECT | O_CREAT , 0755);
       
        if (wfd < 0){
            perror("open ./direct_io.data failed");
            continue;
        }
      
        wret = write(wfd, buf, BUF_SIZE);
        
        if (wret < 0) {
            close(wfd);
            perror("write ./direct_io.data failed");
            continue;
        }
        
        close(wfd);
    } 
    free(buf); 
}

int main()
{
  
    do_api_write_direct();
 
    return 0 ;
}