On Tuesday, October 29, 2013 2:24:17 PM UTC+11, Sam Roberts wrote:
>
> On Mon, Oct 28, 2013 at 5:07 AM, Tim Cuthbertson
> <[email protected]<javascript:>>
> wrote:
> > Thanks for the suggestion, although unfortunately I don't think that
> would
> > work for my real scenario. I'm spawning long running tasks, which may
> > outlive the process that spawned them (which is why I'm directing the
> output
> > into a file). Presumably these streams would all stop working / die when
> my
> > parent process ends.
>
> Have you read the docs for child_process.spawn? In particular, for the
> stdio array?
>
> It looks like you want option (4), where you open a file, and provide
> that file to the child proces as
>
> [ null, f, f],
>
> so the open file is duped in child to fd 1 and 2 (stdout and stderr).
>
> Sam
>
Good point, I missed this in my reading of those docs. It does seem very
similar to what I tried with passing in the same FD twice, but the docs
*do* explicitly say it dup()s the fd. Worth a shot, certainly:
var outpath = '/tmp/output.log';
var out = fs.createWriteStream(outpath);
childProcess.spawn('bash', ['-c', 'echo STOUT; echo STDERR >&2; echo
DONE;'], {stdio: ['ignore', out, out]});
But sadly, I get the same result as when I was passing the same FD twice:
STOUT
DONE
Cheers,
- Tim.
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