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doc: mark accessing IPC channel fd as undefined #17545

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doc: mark accessing IPC channel fd as undefined #17545

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4 changes: 4 additions & 0 deletions doc/api/child_process.md
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Expand Up @@ -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
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