I/O: Improve messaging when user doesn't have permissions to write to… · meikis/processing@a0d5cd7 · GitHub

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gohai

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I/O: Improve messaging when user doesn't have permissions to write to LEDs

This is e.g. the case with the newly released Raspbian 2015-09-24.

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+4-1Lines changed: 4 additions & 1 deletion

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• java/libraries/io/src/processing/io
  • LED.java

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‎java/libraries/io/src/processing/io/LED.java‎

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+4-1Lines changed: 4 additions & 1 deletion

Original file line number	Diff line number	Diff line change
@@ -87,7 +87,10 @@ public LED(String dev) {
87	87	String fn = "/sys/class/leds/" + dev + "/trigger";
88	88	int ret = NativeInterface.writeFile(fn, "none");
89	89	if (ret < 0) {
90		- throw new RuntimeException(fn + ": " + NativeInterface.getError(ret));
	90	+ if (ret == -13) { // EACCES
	91	+ System.err.println("You might need to install a custom udev rule to allow regular users to modify /sys/class/leds/*.");
	92	+ }
	93	+ throw new RuntimeException(NativeInterface.getError(ret));
91	94	}
92	95	}
93	96

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