Hello Andrey,
This sounds like a good idea. Something like this already exists, see
http://www.hdfgroup.org/HDF5/doc1.6/UG/08_TheFile.html and look for "8.8
Buffered temporary files in memory -- CORE driver"
If 'in memory' files are too restrictive for you then you could do as
Elena suggested and modify a file driver.
The old technique for doing this under unix-like systems was to *open*
or *fopen* a file and then *unlink* the file. The open file handle could
still be used and when the program exited for what ever reason the disk
space was reclaimed. This would be slightly less robust then the
*tmpfile(3)* you reference, but probably good enough for HDF5-type
applications.
Unfortunately the HDF5 documentation is ambiguous about whether or not
the underlying Unix file handle associated with a HDF5 open file object
is always maintained by the library or if it ever gets closed and then
reopened by the library during the course of normal processing.
If you need this feature immediately I recommend you test this out as it
is really simple to implement.
Cheers,
--dan
On 04/16/14 04:21, ?????? ????????? wrote:
Hello!
Many (all?) contemporary OSes have notion of "Temporary file" -- a
file that is automatically deleted when the last handle to it is
closed (see http://man7.org/linux/man-pages/man3/tmpfile.3.html,
FILE_FLAG_DELETE_ON_CLOSE in
http://msdn.microsoft.com/en-us/library/windows/desktop/aa363858(v=vs.85).aspx).
Currently it is not possible to specify that FH5Fcreate should open
the file as temporary, nor it is possible to pass existing file
handle. However I believe that temp HDF5 files would be valuable feature:
1) Robust: file is deleted even if program crashes/ends unexpectedly.
2) Easy-to-use: file is deleted when but not earlier than the last
reference to a file object is closed.
Are there any plans to support temp files in HDF5 library, or maybe
there is already some way to create them in released version?
Best wishes,
Andrey Paramonov
--
Daniel Kahn
Science Systems and Applications Inc.
301-867-2162
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