#include <stdio.h>
#include <fcntl.h>
#include <stdint.h>

#define  BLOCK_SIZE (4096) 

#warning ARCH DEPENDENT fixup for your arch
#define O_DIRECT 040000 // ARCH DEPENDENT fixup for your arch */

static char buf[128 * BLOCK_SIZE];


int main(int argc, char** argv)
{
	int fd;
	char* aligned_buf = (char*)(( (uintptr_t)&buf + (BLOCK_SIZE-1)) & ~(BLOCK_SIZE-1));
	int aligned_size = sizeof(buf) - BLOCK_SIZE;
	
	
	if (-1 == ( fd = open (argv[1], O_RDWR | O_CREAT | O_DIRECT))) {
		perror("open: ");
		return 1;
	}
	
	while (1) {
		if( aligned_size!=write(fd, aligned_buf, aligned_size)) {
			perror("write: ");
			return 1;
		}
	}
}