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doc: improve pipe description #42295

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3 changes: 3 additions & 0 deletions doc/api/child_process.md
Expand Up @@ -807,6 +807,9 @@ pipes between the parent and child. The value is one of the following:
`child_process` object as [`subprocess.stdio[fd]`][`subprocess.stdio`]. Pipes
created for fds 0, 1, and 2 are also available as [`subprocess.stdin`][],
[`subprocess.stdout`][] and [`subprocess.stderr`][], respectively.
Currently, these are not actual Unix pipes and therefore the child process
can not use them by their descriptor files,
e.g. `/dev/fd/2` or `/dev/stdout`.
2. `'overlapped'`: Same as `'pipe'` except that the `FILE_FLAG_OVERLAPPED` flag
is set on the handle. This is necessary for overlapped I/O on the child
process's stdio handles. See the
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