Re: [boost] [boost-process] Beta & Review

Subject: Re: [boost] [boost-process] Beta & Review
From: Klemens Morgenstern (klemens.morgenstern_at_[hidden])
Date: 2016-08-07 07:21:48

Am 07.08.2016 um 13:08 schrieb Antony Polukhin:
>> Btw: i recommend to use the asio functionality, that works much better.
> I'm already using that myself, did not run into any problems.
>
> I'd like to have a non ASIO version working out of the box. ASIO is an
> overkill in such simple cases.
>
>
Well, it does work out of the box. Problem is: the pipe is not closed 
automatically, so you might get a deadlock if you're trying to read 
after the program has exited.

Reason is: on posix you can set a flag to close a pipe when the child 
exits. On windows you cannot, you'd have to close the sink on the 
launching process so that only the launched process has a handle to it. 
BUT, when I use an named pipe it is essentially a file-handle. With 
that, it does not work at all. So in order to keep this consistent, the 
pipe will not be closed on child exit. That can cause a deadlock

Now if you know how the output looks, you can use it. If you don't, 
well, you'll probably get a deadlock. In the case of the example: 'nm
' appends an empty line at the end, so I'd need to check for that, i.e.:

while (c.running() && std::getline(is, line) && (line.size() > 0)) {...}

I'll fix the documentation soon.