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

int main(int argc, char ** argv){
	int file_descriptor = open(argv[1], O_RDONLY);
	if(file_descriptor < 0){
		perror("open");
		return 1;
	}
	struct stat fs;
	// TODO:  Check for errors
	fstat(file_descriptor, &fs);
	size_t begin = fs.st_size/3;
	size_t end = 2 * fs.st_size/3;
	char *data = mmap(0, end, PROT_READ, MAP_SHARED, file_descriptor, 0);
	if(data == MAP_FAILED) {
		perror("mmap");
		return 1;
	}
	close(file_descriptor);
	write(1, data + begin, end-begin);
	munmap(data, end);
	return 0;
}