Fix problem with start

gpiosysfs.c

@@ -32,19 +32,17 @@ static void writeToFile(const char *absoluteFileName, const char *contents) {
 }
 
 void gpioSetup(const char *pin) {
-	// TODO only export if not already exported...
-	if (access("/sys/class/gpio/unexport",W_OK) == 0) 
-		writeToFile("/sys/class/gpio/unexport", pin);
-	writeToFile("/sys/class/gpio/export", pin);
-
-	char buf[33];
+	char buf[64];
 	struct stat statBuf;
 	int pinExported = -1;
 
 	sprintf(buf, "/sys/class/gpio/gpio%s/direction", pin);
 
+	if (stat(buf, &statBuf) != 0)
+		writeToFile("/sys/class/gpio/export", pin);
+
 	// May have to briefly wait for OS to make symlink! 
-	while (pinExported != 0) {	
+	while (pinExported != 0) {
 		msleep(1000);
 		pinExported = stat(buf, &statBuf);
 	}