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Last active Aug 29, 2015
What would you like to do?
What keeps my process open?
var setInterval = require('timers').setInterval;
setInterval(function () {
var handles = process._getActiveHandles();
console.log('no of handles', handles.length);
handles.forEach(function (obj) {
if ('ontimeout' in obj) {
console.log('timer handle', obj);
} else if ('readable' in obj && 'writable' in obj) {
// to debug stream handles print the _events functions
// to string and figure out what kind of stream they are
// then stare really hard at the source code
// console.log(obj._events.end.toString());
console.log('stream handle', obj);
} else {
console.log('unknown handle', obj);
}, 5000).unref();

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@othiym23 othiym23 commented Jun 23, 2014

That seems pretty good, but it won't catch any inflight libuv requests (process._getActiveRequests()). But that's even harder to reason about than the handle list. I generally just hand-code a filter like yours and narrow it down until it excludes all the handles I'm expecting, and then dump the rest and start digging from there.


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@bnoordhuis bnoordhuis commented Jun 23, 2014

obj.owner is the owning "public" object, e.g. the encapsulating net.Socket for a TCP handle.

Doesn't work for regular timers because they sit in a queue backed by a single timer handle but it does work for timers that have been unref()'d; those get moved out of the queue and assigned individual timer handles.

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