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

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Message-ID: <20100930100405.GB5265@cr0.nay.redhat.com>
Date:	Thu, 30 Sep 2010 18:04:05 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Andreas Saebjoernsen <andreas@...italplaywright.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: interpreting semantics of ipc system call

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'.
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