error catcher in al fds

main.c

@@ -8,28 +8,48 @@ int main (int argc, char *argv[]){
 	fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
 	if(fd<0)
 	{
-		perror("Error openng the GPIO export path");
+		perror("Error openng the GPIO path");
 		return -1;
 	}
 	write(fd, "17",2);
 	close(fd);
 	//pin direction
 	fd = open("/sys/class/gpio/chip0/gpio17/direction", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error openng the GPIO path");
+		return -1;
+	}
 	write(fd, "out",3);
 	close(fd);
 	//pin value
 	fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error openng the GPIO path");
+		return -1;
+	}
 	write(fd, "1",1);
 	close(fd);
 	sleep(1);
 	//pin apagao
 	fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error openng the GPIO path");
+		return -1;
+	}
 	write(fd, "0",1);
 	close(fd);
 	sleep(1);
 	//unexport
 	
 	fd = open("/sys/class/gpio/chip0/unexport", O_WRONLY);
+	if(fd<0)
+	{
+		perror("Error openng the GPIO path");
+		return -1;
+	}
 	write(fd, "17",2);
 	close(fd);