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Message-ID:	<401228B4.7030402@hccnet.nl>
Date:	Sat, 24 Jan 2004 09:11:32 +0100
From:	Rob Hamerling <r DOT hamerling AT hccnet DOT nl>
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To:	djgpp AT delorie DOT com
Subject:	Re: error 4 with write to serial port
References:	<40101D96 DOT 8070103 AT hccnet DOT nl> <irl110tsp1u83tm88stkb2ntmdqlpn5m7p AT 4ax DOT com> <4011e2d0 DOT 2230942 AT news DOT voyager DOT net>
In-Reply-To:	<4011e2d0.2230942@news.voyager.net>
Reply-To:	djgpp AT delorie DOT com

Hello Chris,



[RobH]
>>>I have built a DOS program with DJGPP to access a serial port.
>>>This program works fine under plain DOS (ic IBM PC/DOS 6.3).
>>>However when I boot from a bootable diskette created with
>>>WinXP and start the program it returns error 4 with a write()
>>>to the serial port.

Chris Giese wrote:

> Does it return error 4 from write() or from open()?
> I think DOS error 4 is "too many open files". Try increasing
> the FILES=nnn value in CONFIG.SYS

It is indeed the write() which returns error 4.
If '4' would mean "too many files" open() would fail, and since the mode 
command, which is called before to set port speed, etc doesn't fail, it 
can't be that problem.
I think the default is 20 files, but I tried it (config.sys didn't 
contain a 'Files=" setting) and it didn't help.

Thanks for your attempt to help anyway!

Regards, Rob.

-- 
Rob Hamerling, Vianen, NL phone +31-347-322822
homepage: http://www.robh.nl/

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