[7286] in linux-scsi channel archive
Re: ioctl error info
daemon@ATHENA.MIT.EDU (Douglas Gilbert)
Wed Sep 29 21:43:13 1999
Message-ID: <37F2C16F.D02C4154@interlog.com>
Date: Wed, 29 Sep 1999 21:48:31 -0400
From: Douglas Gilbert <dgilbert@interlog.com>
MIME-Version: 1.0
To: nealjunk@driversoft.com
CC: linux-scsi@vger.rutgers.edu
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nealjunk@driversoft.com wrote:
>
> Hi,
> How can I get the error info after a failed ioctl? I send a CDB
>
> to the device and it is failing... but when I do a CDB to return the error
> codes it is blank. It looks like the SCSI passthrough driver has already
> got the information.
>
> How do I get it?
Neal,
Are you talking about the SCSI_IOCTL_SEND_COMMAND ioctl()?
If so, from the code (scsi_ioctl.c around line 319), it looks
like the sense buffer is written back overwriting the
command that you sent into the ioctl().
The scsi sub-system does "auto-sense" which means that it
automatically executes REQUEST SENSE after a failure
was detected on the original command. Doing an explicit
REQUEST SENSE subsequent to the auto-sense will not be
useful.
Doug Gilbert
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