[PATCH] PR libstdc++/83279 handle sendfile not copying entire file

[Jonathan Wakely]

On 14/12/17 21:53 +0000, Jonathan Wakely wrote:
>I failed to notice that the man page for sendfile(3) says it won't
>copy more than 2GiB. This refactors the code to first try sendfile
>(because it's fast if it works) and if that fails, or stops before the
>end of the file, then use filebufs to copy what's left over.
>
>I'm not adding a test because creating two files larger than 2G isn't
>a good idea, but I've tested it locally.
>
>	PR libstdc++/83279
>	* src/filesystem/std-ops.cc (do_copy_file): Handle sendfile not
>	copying entire file.


This restores the non-null offset argument to sendfile, which is
required by Solaris.

Tested x86_64-linux, committed to trunk.


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