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From: valentin@cbmvax.commodore.com (Valentin Pepelea)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Bug in DoIO / SendIO ??
Message-ID: <10280@cbmvax.commodore.com>
Date: 20 Mar 90 22:51:50 GMT
References: <9003160832.AA23378@jade.berkeley.edu>
Reply-To: valentin@cbmvax (Valentin Pepelea)
Organization: Commodore, West Chester, PA
Lines: 29

In article <9003160832.AA23378@jade.berkeley.edu> BEYSSAC@FRESE51.BITNET writes:
>
>   There seems to be a bug in the KickStart 1.2 DoIO/SendIO routines.
>On entry they clear the IO_FLAGS fields of the IoRequest structure.

The io_Flags field is reserved. The four lower bits are reserved to Exec's
own use, and the fours upper bits are reserved for the individual device
driver's use.

>   I discovered this using the trackdisk.device in raw mode with the
>IOTDF_INDEXSYNC flag. It didn't work ! I wrote a little patch for DoIO
>and SendIO, and now it works as it should. There is no problem with the
>other parts of the system.

Indeed, this appears to be a bug, but not where you think it is! In this
case, you are supposed to be calling BeginIO() directly rather than
going indirectly thorugh SendIO() or DoIO(). To use BeginIO() you must
link with amiga.lib.

So this is a documentation bug for the trackdisk.device. The documentation
of the audio.device mentions explicitly that BeginIO() must be used. Thank
you for pointing this bug out.

Valentin
-- 
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