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

int main(void){

	int FLAG = O_RDONLY;
	int file = open("/proc/cpuinfo", FLAG);
	
	int size = 1000;
	char *buffer = malloc(size * sizeof(char));
	if(read(file, buffer, size) == -1){
		perror("read error");
		free(buffer);
		return -1;
	}

	char var_name[size];
	char var_value[size];
	sscanf(buffer, "%*s %*s %*s %s %*s %s", var_name, var_value);

	printf("%s: %s\n", var_name, var_value);
	
	int FLAG2 = O_WRONLY;
	int FLAG3 = O_CREAT;
	int FLAG4 = O_APPEND;
	int file2 = open("output.txt", FLAG2 | FLAG3 | FLAG4);
	
	char *msg = "Hallo Welt\n";
		

	if(write(file2, msg, strlen(msg)) == -1){
		perror("write error");
		return -1;
	}


	free(buffer);
	close(file);
	close(file2);	
	return 0;
}