Re: [Boost-bugs] [Boost C++ Libraries] #8305: Allow interprocess to work with big files on x32 POSIX systems

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #8305: Allow interprocess to work with big files on x32 POSIX systems
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-03-18 22:27:29

#8305: Allow interprocess to work with big files on x32 POSIX systems
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  Reporter:  apolukhin     |       Owner:  igaztanaga                                    
      Type:  Patches       |      Status:  new                                           
 Milestone:  Boost 1.54.0  |   Component:  interprocess                                  
   Version:  Boost 1.53.0  |    Severity:  Problem                                       
Resolution:                |    Keywords:  mmap _LARGEFILE64_SOURCE _FILE_OFFSET_BITS==64
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Comment (by igaztanaga):

 I have some questions about the patch. If I understand LFS correctly:

 If _LARGEFILE64_SOURCE is defined, then we have new functions and types
 like open64/off64_t...

 If _FILE_OFFSET_BITS=64 then "open"/"off_t"... are 64 bit ready.

 Using O_LARGEFILE does not seem to guarantee compatibility as
 _FILE_OFFSET_BITS can be 32 and off_t would be 32 bits. We could open
 files bigger than 2GB but no seek or map them.

 Maybe the solution is to use xxx64 functions and types if
 _LARGEFILE64_SOURCE is defined and _FILE_OFFSET_BITS is not defined or
 it's equal to 32. Or am I missing something?

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8305#comment:2>
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