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doc: refine child_process detach behaviour

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this adds an example of a long running node process that actually
executes node code.
Also it mentions the not to harmonic detach behaviours of the
different platforms, whereas detaching on unix requires ignoring
the child_process' stdio explicitely.

PR-URL: https://github.com/nodejs/node/pull/5330
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
This commit is contained in:
Robert Jefe Lindstaedt 2016-02-19 21:17:24 +01:00 committed by James M Snell
parent d7987d9c35
commit 82c2996e2d
1 changed files with 21 additions and 8 deletions
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29
doc/api/child_process.markdown
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@ -391,8 +391,27 @@ Doing so will cause the parent's event loop to not include the child in its
reference count, allowing the parent to exit independently of the child, unless reference count, allowing the parent to exit independently of the child, unless
there is an established IPC channel between the child and parent. there is an established IPC channel between the child and parent.
Example of detaching a long-running process and redirecting its output to a When using the `detached` option to start a long-running process, the process
file: will not stay running in the background after the parent exits unless it is
provided with a `stdio` configuration that is not connected to the parent.
If the parent's `stdio` is inherited, the child will remain attached to the
controlling terminal.
Example of a long-running process, by detaching and also ignoring its parent
`stdio` file descriptors, in order to ignore the parent's termination:
```js
const spawn = require('child_process').spawn;
const child = spawn(process.argv[0], ['child_program.js'], {
detached: true,
stdio: ['ignore']
});
child.unref();
```
Alternatively one can redirect the child process' output into files:
```js ```js
const fs = require('fs'); const fs = require('fs');
@ -408,12 +427,6 @@ const child = spawn('prg', [], {
child.unref(); child.unref();
``` ```
When using the `detached` option to start a long-running process, the process
will not stay running in the background after the parent exits unless it is
provided with a `stdio` configuration that is not connected to the parent.
If the parent's `stdio` is inherited, the child will remain attached to the
controlling terminal.
#### options.stdio #### options.stdio
The `options.stdio` option is used to configure the pipes that are established The `options.stdio` option is used to configure the pipes that are established