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

int main (int argc, char *argv[]){
	int fd; 
	// export 
	fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
	write(fd,"17", 2);
	close(fd);
	
	//pin direction
	fd = open("/sys/class/gpio/chip0/gpio17/direction", O_WRONLY);
	write(fd,"out", 3);
	close(fd);


	//pin value
	fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
	write(fd,"1", 1);
	close(fd);
	sleep(1);
	
	fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
	write(fd,"0", 1);
	close(fd);
	sleep(1);
	
	//unexport 
	fd = open("/sys/class/gpio/chip0/unexport", O_WRONLY);
	write(fd,"17", 2);
	close(fd);
	




	printf("Hello from Raspberry Pi!\n");
	printf("Number of arguments: %d\n",argc);
	printf("Program is reciving: %s\n",argv[0]);

	if (argc > 1)
		printf("Argument: %s\n", argv[1]);
	return 0;
}