error catcher in all fds

main.c

@@ -17,26 +17,51 @@ int main(int argc, char *argv[])
 	close(fd);
 	// DIRECTION	
 	fd = open("/sys/class/gpio/chip0/gpio17/direction", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error opening GPIO path");
+		return -1;
+	}
 	write(fd, "out",3);
 	close(fd);
 	// VALUE	
 	fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error opening GPIO path");
+		return -1;
+	}
 	write(fd, "1", 1);
 	close(fd);
 	sleep(1);
 	// Unexport
 	fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error opening GPIO path");
+		return -1;
+	}
 	write(fd, "0", 1);
 	close(fd);
 	sleep(1);
 
 
 	fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error opening GPIO path");
+		return -1;
+	}
 	write(fd, "1", 1);
 	close(fd);
 	sleep(1);
 
 	fd = open("/sys/class/gpio/chip0/gpio17/unexport", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error opening GPIO path");
+		return -1;
+	}
 	write(fd, "17", 2);
 	close(fd);