std.MmFile.Mode.readCopyOnWrite documentation/implementation
Bastiaan Veelo
Bastiaan at Veelo.net
Mon Jun 3 09:11:41 UTC 2019
Currently[1], std.MmFile.Mode.readCopyOnWrite is documented as
> readCopyOnWrite, /// Read/Write existing file, copy on write
When I test that on Windows, what seems to happen is that when
written to, memory is copied and the copy is no longer backed by
a file. So changes are not persistent and I think this should be
clarified in the documentation. This mode will not change the
file, and Read/Write should actually be Read, I would think. But
marking the file read-only will cause this to fail, as the file
is actually opened Read/Write in the implementation, and I wonder
whether it should be opened read-only instead. The implementation
is platform-specific, so what works on one might not work on the
other.
Any input on this?
Bastiaan.
[1]
https://github.com/dlang/phobos/blob/841541fca9c8c0224f3d47ef11db219a9fa5e065/std/mmfile.d#L64
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