cf Re: (OT) place on linux box to safely create tons of temp junk???
As that node indicates, one solution to retain your information is to rewind your file handle. This works so long as all that you want is for that information to be available to the process which already has the handle.
On some OSes with /proc file systems, the OS exposes the file handles. In linux, for example, if my PID is 54321, file handle #4 can be found at /proc/54321/fd/4. This "file" can be copied back into the regular filesystem, read by other applications (so long as you have the correct permissions), etc.
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