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doc: mark accessing IPC channel fd as undefined

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Adds note that accessing the fd of the IPC channel in any other way
than process.send, or using the IPC channel with child processes that
is not Node.js is not supported.

PR-URL: https://github.com/nodejs/node/pull/17545
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
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Bartosz Sosnowski 2017-12-08 11:56:53 +01:00 committed by Ruben Bridgewater
parent 33103e9758
commit ea1a07656e
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doc/api/child_process.md
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@ -621,6 +621,10 @@ pipes between the parent and child. The value is one of the following:
will enable [`process.send()`][], [`process.disconnect()`][],
[`process.on('disconnect')`][], and [`process.on('message')`] within the
child.
Accessing the IPC channel fd in any way other than [`process.send()`][]
or using the IPC channel with a child process that is not a Node.js instance
is not supported.
3. `'ignore'` - Instructs Node.js to ignore the fd in the child. While Node.js
will always open fds 0 - 2 for the processes it spawns, setting the fd to
`'ignore'` will cause Node.js to open `/dev/null` and attach it to the