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doc: document 'inherit' option for stdio (non-shorthand) #22309

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doc: document 'inherit' option for stdio (non-shorthand) #22309

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13 changes: 8 additions & 5 deletions doc/api/child_process.md
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Original file line number Diff line number Diff line change
Expand Up @@ -599,8 +599,7 @@ For convenience, `options.stdio` may be one of the following strings:

* `'pipe'` - equivalent to `['pipe', 'pipe', 'pipe']` (the default)
* `'ignore'` - equivalent to `['ignore', 'ignore', 'ignore']`
* `'inherit'` - equivalent to `[process.stdin, process.stdout, process.stderr]`
or `[0,1,2]`
* `'inherit'` - equivalent to `['inherit', 'inherit', 'inherit']` or `[0, 1, 2]`

Otherwise, the value of `options.stdio` is an array where each index corresponds
to an fd in the child. The fds 0, 1, and 2 correspond to stdin, stdout,
Expand All @@ -626,16 +625,20 @@ pipes between the parent and child. The value is one of the following:
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
child's fd.
4. {Stream} object - Share a readable or writable stream that refers to a tty,
4. `'inherit'` - Pass through the corresponding stdio stream to/from the
parent process. In the first three positions, this is equivalent to
`process.stdin`, `process.stdout`, and `process.stderr`, respectively. In
any other position, equivalent to `'ignore'`.
5. {Stream} object - Share a readable or writable stream that refers to a tty,
file, socket, or a pipe with the child process. The stream's underlying
file descriptor is duplicated in the child process to the fd that
corresponds to the index in the `stdio` array. Note that the stream must
have an underlying descriptor (file streams do not until the `'open'`
event has occurred).
5. Positive integer - The integer value is interpreted as a file descriptor
6. Positive integer - The integer value is interpreted as a file descriptor
that is currently open in the parent process. It is shared with the child
process, similar to how {Stream} objects can be shared.
6. `null`, `undefined` - Use default value. For stdio fds 0, 1, and 2 (in other
7. `null`, `undefined` - Use default value. For stdio fds 0, 1, and 2 (in other
words, stdin, stdout, and stderr) a pipe is created. For fd 3 and up, the
default is `'ignore'`.

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