I/O: Don't throw an exception when trying to release unused pins

gohai · gohai · commit 243b4a7bfb6e · 2015-10-12T00:05:34.000+02:00
diff --git a/java/libraries/io/src/processing/io/GPIO.java b/java/libraries/io/src/processing/io/GPIO.java
@@ -492,8 +492,10 @@ public static void releasePin(int pin) {
       if (ret == -2) {    // ENOENT
         System.err.println("Make sure your kernel is compiled with GPIO_SYSFS enabled");
       }
-      // EINVAL is also returned when trying to unexport pins that weren't exported to begin with
-      throw new RuntimeException(NativeInterface.getError(ret));
+      // EINVAL is returned when trying to unexport pins that weren't exported to begin with, ignore this case
+      if (ret != -22) {
+        throw new RuntimeException(NativeInterface.getError(ret));
+      }
     }
   }
 

Original file line number	Diff line number	Diff line change
`@@ -492,8 +492,10 @@ public static void releasePin(int pin) {`
`492`	`492`	`if (ret == -2) { // ENOENT`
`493`	`493`	`System.err.println("Make sure your kernel is compiled with GPIO_SYSFS enabled");`
`494`	`494`	`}`
`495`		`- // EINVAL is also returned when trying to unexport pins that weren't exported to begin with`
`496`		`- throw new RuntimeException(NativeInterface.getError(ret));`
	`495`	`+ // EINVAL is returned when trying to unexport pins that weren't exported to begin with, ignore this case`
	`496`	`+ if (ret != -22) {`
	`497`	`+ throw new RuntimeException(NativeInterface.getError(ret));`
	`498`	`+ }`
`497`	`499`	`}`
`498`	`500`	`}`
`499`	`501`