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From: "Nikita V. Youshchenko" <yoush@cs.msu.su>
To: LKML <linux-kernel@vger.kernel.org>
Subject: Extended error reporting to user space?
Date: Tue, 16 Feb 2010 15:20:26 +0300	[thread overview]
Message-ID: <201002161520.26700@zigzag.lvk.cs.msu.su> (raw)

Hi

I'm developing a device driver that, in it's ioctl()s, accepts a complex 
data structure. Before doing it's operation, it performs large number of 
checks if data is valid. If one of those checks fail, driver 
returns -EINVAL.

Unfortunately this -EINVAL is not really useful. E.g. if a developer, 
sitting in his IDE and debugging his code, will see ioctl() 
returning -EINVAL, and will have hard times finding what exactly is wrong.

Before inventing driver-specific extended error reporting, I'd like to ask 
if there is anything more or less generic for this.
I believe situation when -Exxx is too weak interface for error reporting is 
common.

Nikita

             reply	other threads:[~2010-02-16 12:20 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-16 12:20 Nikita V. Youshchenko [this message]
2010-02-16 12:23 ` Alexey Dobriyan
2010-02-16 13:17   ` Américo Wang
2010-02-17  9:58 ` Andi Kleen
2010-02-17 10:16   ` Nikita V. Youshchenko
2010-02-17 10:35     ` Andi Kleen
2010-02-17 19:20       ` Dr. David Alan Gilbert
2010-02-17 20:23         ` Andi Kleen
2010-02-21  0:02           ` Dr. David Alan Gilbert
2010-02-17 10:43     ` Alan Cox
2010-02-17 11:57       ` Andi Kleen

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