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echo: os2prog
to: Paul Edwards
from: Jonathan de Boyne Pollard
date: 1996-10-10 00:58:12
subject: file handles

PE>
  > With a 16-bit MSC 6.0 compiled program, I only appear to be
  > able to open 14 files via fopen, even when I use "fh" (a
  > program to increase the maximum number of file handles).
  > When I run a program that calls DosOpen instead of open,
  > the restriction goes from 14 to 44.
PE>

  The 14 file limit is a C Runtime Library limit (Borland C++ has a
  similar limit).  The 44 file limit sounds like the default per-process
  file table size of 50, less 6 already open file handles (stdin, stdout,
  stderr and suchlike).  Which in turn implies that your "fh" program
  isn't doing its job -- check the code (remember that changing the PPFT
  limit only affects the *current process* and the PPFT limits in any
  children that it may sunsequently spawn).

  I experimented with this myself a couple of years ago.  The per-process
  file table can be expanded to a limit of 32767 open handles using the
  appropriate API (DosSetRelMaxFH).

  > JdeBP <
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