linux-kernel - Question on SI

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Message-ID: <20081203040303.GA4071@us.ibm.com>
Date:	Tue, 2 Dec 2008 20:03:03 -0800
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Subject: Question on SI_ASYNCIO

Hi,

SI_ASYNCIO is defined in include/asm-generic/siginfo.h as:

	#define SI_ASYNCIO      -4              /* sent by AIO completion */

The negative value makes it a 'user-space' signal according to 

	#define SI_FROMUSER(siptr)      ((siptr)->si_code <= 0)
	#define SI_FROMKERNEL(siptr)    ((siptr)->si_code > 0)

But this signal is generated in the kernel async_completed() -
drivers/usb/core/devio.c

Am trying to understand why this is considered as a user-space signal ?

Isn't SI_ASYNCIO similar to SI_POLL or SI_MESGQ - both of which are
'kernel-signals' ?

POSIX.1 explicitly ignores async io. 

Thanks,

Sukadev

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