#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);

	//pin
	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;
}