linux-kernel - Re: interpreting semantics of ipc system call

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Message-Id: <201009301337.55511.arnd@arndb.de>
Date:	Thu, 30 Sep 2010 13:37:55 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Andreas Saebjoernsen <andreas@...italplaywright.com>,
	linux-kernel@...r.kernel.org
Subject: Re: interpreting semantics of ipc system call

On Thursday 30 September 2010, Américo Wang wrote:
> On Wed, Sep 29, 2010 at 03:03:11PM -0700, Andreas Saebjoernsen wrote:
> >We are developing a simulator that can simulate any specimen x86 linux program.
> >Our simulator has a simulated memory, unlike the concrete memory state of
> >tools like Valgrind, so that we can do concrete symbolic execution. Instead of
> >reimplementing the system calls we marshal the system calls called by
> >the specimen.
> >
> >I am currently working on marshaling calls to the ipc system call (system
> >call 117) which has the following signature
> >
> >int ipc(unsigned int call, int first, int second, int third, void
> >*ptr, long fifth)
> >
> >I have a problem interpreting what the size is of the data structure
> >pointed to by
> >the 'void*', and I have been unable to locate good documentation or code on the
> >semantics of this system call.
> 
> 
> Take a look at ipc/syscall.c, that pointer will be interpreted to different
> data structures when you pass different arguments to 'call'.

Right. Note that you can ignore the version field for all practical
purposes and consider it constant.

	Arnd
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