[Boost-users] [iostreams] boost::ostreams::file_descriptor_sink closing file handle

Subject: [Boost-users] [iostreams] boost::ostreams::file_descriptor_sink closing file handle
From: Scott Quiring (scott.quiring_at_[hidden])
Date: 2010-05-20 18:59:05

Hi,

I'm using file_descriptor_sink to obtain a stream to a given file 
handle.  It's important that the file remain open past the lifetime of 
that object, so I send in false as the second parameter to the 
constructor (close_on_exit).  It seems the file is being closed anyway.  
Here is an example:

#include <iostream>
#include <boost/iostreams/stream.hpp>
#include <boost/iostreams/device/file_descriptor.hpp>

int main(int argc, const char *argv[])
{
     std::cout << "foo" << std::endl;

     {
         boost::iostreams::stream<boost::iostreams::file_descriptor_sink>
             stream(fileno(stdout), false);

         stream << "bar" << std::endl;
     }

     std::cout << "baz" << std::endl;

     return 0;
}

Here we expect

foo
bar
baz

to be written, when only

foo
bar

is written.  Note that the output is the same regardless of whether true 
or false is sent into the constructor.

Is this a boost bug, or is there something I'm missing here?

I'm using gcc 4.3.4 on Ubuntu 10.04 if that makes any difference.

Thanks,
Scott Quiring