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child_process: add public API to unref ipc channel #9313

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mscdex opened this issue Oct 27, 2016 · 2 comments
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child_process: add public API to unref ipc channel #9313

mscdex opened this issue Oct 27, 2016 · 2 comments
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child_process Issues and PRs related to the child_process subsystem. doc Issues and PRs related to the documentations. feature request Issues that request new features to be added to Node.js.

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@mscdex
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mscdex commented Oct 27, 2016 •
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  • Version: all
  • Platform: n/a
  • Subsystem: child_process

It would be nice to have a public API to unref() a child process's ipc channel. My use case for this is that I spawn a child process, send some messages back and forth via ipc, then at some point I want to detach the child process. child.unref() is not enough because that only unrefs the C++ ProcessWrap handle. Currently I have to resort to also doing child._channel.unref(). I am not sure if this should be done automatically inside child.unref() or if there should be a separate function or similar.
@mscdex mscdex added child_process Issues and PRs related to the child_process subsystem. feature request Issues that request new features to be added to Node.js. labels Oct 27, 2016
@sam-github
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I've unrefed _channel, too, for similar reasons, and other reasons.

I'm not sure ._channel should be quietly unrefed when you unref the ChildProcess. It seems inconsistent to me, because child#unref() doesn't unref the other pipes, like stdout, stderr, or even pipes on descriptors higher than 2.

I'd prefer for .channel to just be documented as a property that comes into existence when 'ipc' is in the stdio: options, as .stdout and the others are. This would mean changing the name of _channel, aliasing its name so both names exist, or just documenting _channel. I'd prefer aliasing in v7, deprecating in v8, and removing in v9.

@sam-github sam-github added doc Issues and PRs related to the documentations. docs-requested and removed doc Issues and PRs related to the documentations. labels Oct 27, 2016
@cjihrig cjihrig mentioned this issue Oct 27, 2016
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@cjihrig
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cjihrig commented Oct 27, 2016

I like that idea. I've opened #9322 as a potential starting point.

cjihrig added a commit to cjihrig/node that referenced this issue Nov 2, 2016
@cjihrig
child_process: add public API for IPC channel
2dcb7f3 
This commit adds a public channel property to ChildProcess. The
existing _channel property is aliased to the new property, with
the intention of deprecating and removing it in the future.

Fixes: nodejs#9313
PR-URL: nodejs#9322
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Sam Roberts <[email protected]>
evanlucas pushed a commit that referenced this issue Nov 3, 2016
@cjihrig @evanlucas
child_process: add public API for IPC channel
7b0e937 
This commit adds a public channel property to ChildProcess. The
existing _channel property is aliased to the new property, with
the intention of deprecating and removing it in the future.

Fixes: #9313
PR-URL: #9322
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Sam Roberts <[email protected]>
@sam-github sam-github added doc Issues and PRs related to the documentations. and removed doc Issues and PRs related to the documentations. labels Dec 1, 2016
@addaleax addaleax mentioned this issue Oct 29, 2019
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addaleax added a commit to addaleax/node that referenced this issue Nov 5, 2019
@addaleax
child_process: create proper public API for channel
cc7ff9e 
Instead of exposing the C++ bindings object as `subprocess.channel`
or `process.channel`, provide the “control” object that was
previously used internally as the public-facing variant of it.

This should be better than returning the raw pipe object, and
matches the original intention (when the `channel` property was
first added) of providing a proper way to `.ref()` or `.unref()`
the channel.

Refs: nodejs#9322
Refs: nodejs#9313
@frangio frangio mentioned this issue Nov 6, 2019
Merged
9 tasks
addaleax added a commit to addaleax/node that referenced this issue Jan 3, 2020
@addaleax
child_process: create proper public API for channel
ef418e1 
Instead of exposing the C++ bindings object as `subprocess.channel`
or `process.channel`, provide the “control” object that was
previously used internally as the public-facing variant of it.

This should be better than returning the raw pipe object, and
matches the original intention (when the `channel` property was
first added) of providing a proper way to `.ref()` or `.unref()`
the channel.

Refs: nodejs#9322
Refs: nodejs#9313
BridgeAR pushed a commit that referenced this issue Jan 3, 2020
@addaleax @BridgeAR
child_process: create proper public API for channel
e65bed1 
Instead of exposing the C++ bindings object as `subprocess.channel`
or `process.channel`, provide the “control” object that was
previously used internally as the public-facing variant of it.

This should be better than returning the raw pipe object, and
matches the original intention (when the `channel` property was
first added) of providing a proper way to `.ref()` or `.unref()`
the channel.

PR-URL: #30165
Refs: #9322
Refs: #9313
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Denys Otrishko <[email protected]>
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: James M Snell <[email protected]>
@snyk-bot snyk-bot mentioned this issue Jan 11, 2023
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