Re: problems getting stderr and stdout from process object

Tom Anderson <>
Mon, 28 Sep 2009 23:02:15 +0100
On Mon, 28 Sep 2009, Daniel Pitts wrote:

Tom Anderson wrote:

On Mon, 28 Sep 2009, Daniel Pitts wrote:

 3. 1 and 2 combined.

What would also be useful would be a way to redirect the child's input or
output from or to a file (or /dev/null or its equivalent). You could then
run a process, feed it input, wait for it to finish, then read the output
file. Only one thread needed, and no IO weirdness.

That could be additional functionality that might be useful, although it
can currently be achieved multiple ways. Though you'd still have to deal
with IO, which is the ultimate weirdness in CS theory :-)

Nah, it's just a monad.

Huh. Yeah, good point.

If all your thread is doing is pumping data into the child process,
there is nothing more to think about. The above paragraph looks mostly
like FUD to me - no offence, i just think this is a manifestation of
the superstitious fear of threads that is commonplace in the java

Actually, in this case, the extra thread is pumping the data *out of*
the external process, into the current JVM. The implementation isn't
actually that hard to get correct. I might have given into hyperbole,
but I have seen many incorrect attempts, and only a few correct ones.

Fair enough. You could probably say that about a truly depressing number
of problems, though!


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