RE: [boost] Re: IOStream mmap too restrictive?

From: Ben Hutchings (ben.hutchings_at_[hidden])
Date: 2004-09-02 08:46:33

Jonathan Graehl <jonathan_at_[hidden]> wrote:
<snip>
> I don't see how, in Windows, to atomically keep the file open before 
> it's mmapped, because chsize takes an int fh and the (equivalent of) 
> mmap takes a HANDLE (maybe there is some Win32 call to get the HANDLE 
> from the int fh?).
<snip>

You mean file descriptor, not "int fh".  "File handle" usually means a
FILE or FILE pointer.  Anyway, file descriptors are a Unix feature
emulated by many C libraries and not by Win32.  The VC++ library
provides the function _get_osfhandle which returns the underlying Win32
file handle for a file descriptor.  Other C/C++ libraries for Windows
may provide similar functions.