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From: "Rod Pemberton" <do_not_have AT nohavenot DOT cmm>
Newsgroups: comp.os.msdos.djgpp,comp.os.msdos.programmer
Subject: Re: DJGPP Setup?
Date: Tue, 24 Mar 2009 06:50:05 -0400
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"Ethan Rosenberg" <ethros AT earthlink DOT net> wrote in message
news:0KGZ00GQ8UBIYMM0 AT mta4 DOT srv DOT hcvlny DOT cv DOT net...

In comp.os.msdos.djgpp,

> I have a program that opens almost 30 files.

How is that possible?...  What version of DOS and DJGPP are you using?

According to the following source, DOS limits a single process to a maximum
of 20 file handles even if config.sys' FILES= line is larger.  Three of
these 20 handles are consumed by stdin, stdout, stderr.

See "RESTRICTIONS ON HANDLE USAGE" in Dave Williams DOSREF22 here:
http://nersp.nerdc.ufl.edu/~esi4161/files/dosman/chap7

You can find various versions of the entire DOSREF package by searching for
dosref22.zip, dosref33.zip, or dosref34.zip.

> With fptr27 and fptr25, after approx 20 writes, it gives garbage.

Perhaps, DOS is automatically closing your extra files or DJGPP is reusing
the file handles... (?)


Rod Pemberton
PS added comp.os.msdos.programmer