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doc: clarify stream direction in options.stdio note #65236

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7 changes: 6 additions & 1 deletion doc/api/child_process.md
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Expand Up @@ -1064,7 +1064,12 @@ pipes between the parent and child. The value is one of the following:
as it may result in undefined behavior or dropped callbacks if the stream
encounters errors. Always ensure that `stdin` is used as readable and
`stdout`/`stderr` as writable to maintain the intended flow of data between
the parent and child processes.
the parent and child processes. The stream passed in the `stdin` position
is the source from which the child process reads its input, and the
streams in the `stdout`/`stderr` positions receive the output the child
writes. This is the opposite of [`subprocess.stdin`][] (writable) and
[`subprocess.stdout`][] (readable), which are the parent's ends of the
pipes created by `'pipe'`.
7. Positive integer: The integer value is interpreted as a file descriptor
that is open in the parent process. It is shared with the child
process, similar to how {Stream} objects can be shared. Passing sockets
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