[3868] in arla-drinkers
Re: Arla 0.42-RC2
daemon@ATHENA.MIT.EDU (Rick C. Petty)
Wed Apr 5 13:40:38 2006
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Date: Wed, 5 Apr 2006 12:33:48 -0500
From: "Rick C. Petty" <rick-arla@kiwi-computer.com>
To: Jeffrey Hutzelman <jhutz@cmu.edu>
Subject: Re: Arla 0.42-RC2
Message-ID: <20060405173348.GB3067@megan.kiwi-computer.com>
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On Tue, Apr 04, 2006 at 12:28:12PM -0400, Jeffrey Hutzelman wrote:
>
> Then it should return ENXIO ("no such device or address"), not ENODEV ("no
> such device"). The distinction is subtle, but
>
> - ENODEV means "there is no driver to handle that device node"
> - ENXIO means "the driver exists, but the device does not"
> - EIO means "the device exists, but we had trouble using it"
The FreeBSD intro(2) manpage describes it even better:
6 ENXIO Device not configured. Input or output on a special file
referred to a device that did not exist, or made a request beyond
the limits of the device. This error may also occur when, for
example, a tape drive is not online or no disk pack is loaded on
a drive.
19 ENODEV Operation not supported by device. An attempt was made to
apply an inappropriate function to a device, for example, trying
to read a write-only device such as a printer.
5 EIO Input/output error. Some physical input or output error occurred.
This error will not be reported until a subsequent operation on
the same file descriptor and may be lost (over written) by any
subsequent errors.
-- Rick C. Petty
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