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doc: document missing properties in child_process
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Add documentation for subprocess.exitCode, subprocess.signalCode,
subprocess.spawnargs, and subprocess.spawnfile.

PR-URL: #31342
Fixes: #27206
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
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HarshithaKP authored and codebytere committed Feb 17, 2020
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35 changes: 35 additions & 0 deletions doc/api/child_process.md
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Expand Up @@ -1055,6 +1055,13 @@ When the child process is a Node.js instance (e.g. spawned using
[`child_process.fork()`][]), the `process.disconnect()` method can be invoked
within the child process to close the IPC channel as well.

### `subprocess.exitCode`

* {integer}

The `subprocess.exitcode` property indicates the exit code of the child process.
If the child process is still running, the field will be null.

### `subprocess.kill([signal])`
<!-- YAML
added: v0.1.90
Expand Down Expand Up @@ -1348,6 +1355,34 @@ It is also recommended that any `'message'` handlers in the child process
verify that `socket` exists, as the connection may have been closed during the
time it takes to send the connection to the child.

### `subprocess.signalCode`

* {integer}

The `subprocess.signalCode` property indicates the signal number received by
the child process if any, else null.

### `subprocess.spawnargs`

* {Array}

The `subprocess.spawnargs` property represents the full list of command line
arguments the child process was launched with.

### `subprocess.spawnfile`

* {string}

The `subprocess.spawnfile` property indicates the executable file name of
the child process that is launched.

For [`child_process.fork()`][], its value will be equal to
[`process.execPath`][].
For [`child_process.spawn()`][], its value will be the name of
the executable file.
For [`child_process.exec()`][], its value will be the name of the shell
in which the child process is launched.

### `subprocess.stderr`
<!-- YAML
added: v0.1.90
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