srand(time(NULL)*getpid());
	int s = (10 + rand()%101)*1024;
	char name[sizeof(getpid()) + 4];
	sprintf(name, "%d", getpid());
	name[4] = '.';
	name[5] = 't';
	name[6] = 'x';
	name[7] = 't';
	char* buf = malloc(1);
	if(!buf)
		ERR("malloc");
	buf[0] = n + '0';

	if((out = TEMP_FAILURE_RETRY(open(name, O_WRONLY|O_CREAT|O_TRUNC|O_APPEND, 0777))) < 0)
		ERR("open");
	for(int i=0; i<1; i++)
	{
		for(int i=0; i<s; i++)
			if((c = bulk_write(out, buf, 4)) < 0)
				ERR("write");
		TEMP_FAILURE_RETRY(fprintf(stderr, "Block of %d bytes transfered.\n", s*4));
	}

	if(TEMP_FAILURE_RETRY(close(out)))
		ERR("close");
	free(buf);