From: Jonathan Turkanis (technews_at_[hidden])
Date: 2004-09-02 18:09:42
"Jonathan Graehl" <jonathan_at_[hidden]> wrote in message
> In any case it looks like this SetFileValidData for win32,
The docs say this works only for NTFS volumes. The description of the parameter
ValidDataLength says: "This parameter must be a positive value that is greater
than the current valid data length, but less than the current file size."
It looks like SetEndOffFile is the correct function. The remarks say: "This
function can be used to truncate or extend a file. If the file is extended, the
contents of the file between the old EOF position and the new position are not
> and ftruncate
> for POSIX, could be used by memmap.c to support automatic creation of an
> appropriately sized backing file in the constructor for mapped_file (and
> the constructor for mapped output files in the IO lib could expose
This could be useful.
> I still think a truncate/SetFileValidData wrapper would be nice
> for the filesystem lib.
> I'm willing to code this if people think it's a good idea. It frees
> users from having to first create an empty file of the right length first.
I'm interested. It sounds like something people want for memory-mapped files.
But be careful reading those windows docs! ;-)