Re: [boost] [gsoc] Boost.Process done

Subject: Re: [boost] [gsoc] Boost.Process done
From: Ilya Sokolov (ilyasokol_at_[hidden])
Date: 2010-08-18 05:23:56

Boris Schaeling wrote:
> Here are the results of the Boost.Process project within this year's 
> Google Summer of Code program: We have a complete library to manage 
> system processes now!
> 
> If you like to play around with the library download the ZIP file from 
> <http://www.highscore.de/boost/gsoc2010/process.zip>. As it's a 
> header-only library simply copy the files to your Boost folder. If you 
> like to quickly check the documentation click on 
> <http://www.highscore.de/boost/gsoc2010/>.

Consider this program (untested):

// simulate daemon process
for (int i = 0; i < F_MAXFD; ++i) close(i);

namespace bp == boost::process;

bp::context ctx;

// 1
ctx.stderr_behavior = bp::behavior::pipe::create(
     bp::behavior::pipe::output_stream);

// 2
ctx.stdout_behaviour = bp::behavior::pipe::create(
     bp::behavior::pipe::output_stream);

// 3
bp::child foo =
   bp::create_child("foo", std::vector<std::string>(), ctx);

After line 1 we have:
fd   refers to
0    rend of pipe created for stderr
1    wend of pipe created for stderr

After line 2:
0    rend of pipe created for stderr
1    wend of pipe created for stderr
2    rend of pipe created for stdout
3    wend of pipe created for stdout

Now after line 3 the child process has the following fds:
0    closed
1    wend of pipe created for stdout
2    wend of pipe created for stdout (!)
3    closed