user30403: Where can I find the code for Arduino's attachInterrupt function?
A search on the Arduino's Github repo yielded nothing.
I suspect it might be a wrapper for some avr-libc function but nothing in the avr-libc docs stands out to me...

user33871: It's in the core in WInterrupts.c
On my install it's at:
arduino-1.8.5/hardware/arduino/avr/cores/arduino/WInterrupts.c

30403: <p>Where can I find the code for <a href="https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/" rel="nofollow noreferrer">Arduino's <code>attachInterrupt</code></a> function?</p>

<p>A search on the <a href="https://github.com/arduino/Arduino" rel="nofollow noreferrer">Arduino's Github repo</a> yielded nothing.</p>

<p>I suspect it might be a wrapper for some avr-libc function but nothing in <a href="https://www.nongnu.org/avr-libc/user-manual/group__avr__interrupts.html" rel="nofollow noreferrer">the avr-libc docs</a> stands out to me...</p>
 33871: <p>It's in the core in WInterrupts.c</p>

<p>On my install it's at:</p>

<p>arduino-1.8.5/hardware/arduino/avr/cores/arduino/WInterrupts.c</p>
