Signal handlers are not removed/reverted with process.removeAllListeners([signal])

[chjj]

Handling signals in C has the advantage of calling the signal handler even if the main thread is blocked. Since javascript is limited in this area, I went for a workaround: unbind my SIGINT listener before doing my blocking operation. In doing so, I think I discovered a slight inconsistency.

process.on('SIGINT', function() {
  console.log('SIGINT');
  process.exit(0);
});
process.removeAllListeners('SIGINT');
console.log('start loop');
for (;;);

Even after removing the SIGINT listener, SIGINT still has no effect:

$ node test-signal.js
start loop
...
^C^C^C^C^C^C
...
^\
Quit (core dumped)
$

However, if I specifically remove the SIGINT listener, SIGINT reverts back to its original behavior:

var handle_sigint;
process.on('SIGINT', handle_sigint = function() {
  console.log('SIGINT');
  process.exit(0);
});
process.removeListener('SIGINT', handle_sigint);
console.log('start loop');
for (;;);

$ node test-signal.js
start loop
...
^C
$

Node Version: v0.12.7

[jasnell]

Does not occur within io.js so possible backport