[Boost-users] [iostream] Problems opening large mapped_file

Subject: [Boost-users] [iostream] Problems opening large mapped_file
From: Heiko Klein (Heiko.Klein_at_[hidden])
Date: 2012-08-06 12:43:08

Hi,

I wanted to test the mapped_file_source iostream device. My code is 
working well with a normal file_source device and files >= 6GB. When I 
change the constructor to a mapped_file_source, it works still well for 
smaller files (e.g. 150MB), but for files > 2GB I get (tested with 2.5GB):

exception occured: failed getting file size: Value too large for defined 
data type

And for files > 4GB (tested with 6GB) I get:

exception occured: failed opening file: Bad file descriptor

My constructor is as follows:

         using namespace boost::iostreams;
         typedef stream<mapped_file_source> mmStream;
         mmStream* mmistream = new mmStream();
         mmistream->open(mapped_file_source(fileName));

I've tested against boost 1.44 and a 32bit linux (Ubuntu 10.04).

Are these general mmap problems, or am I missing some flags for 
mapped_file_source?

Best regards,

Heiko