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

int main(int argc, char ** argv){
	if(argc < 2){
		printf("Usage:  %s filename\n", argv[0]);
		return 1;
	}
	int fd = open(argv[1], O_RDONLY);
	printf("Our fd is %d\n", fd);
	if(fd < 0){
		perror(argv[1]);		
		return 1;
	}
	struct stat sb;
	fstat(fd, &sb);
	char *contents = (char*)malloc(sb.st_size);
	ssize_t readlen = read(fd, contents, sb.st_size);
	if(readlen == sb.st_size)
		printf("We read the expected amount of bytes\n");
	else 
		printf("We read %d bytes, expected %d\n", readlen, sb.st_size);

	size_t third = readlen / 3;
	contents[third * 2] = 0;
	puts(contents + third);
	
	close(fd);
	return 0;
}