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

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Date:	Wed, 29 Sep 2010 15:16:28 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Andreas Saebjoernsen <andreas@...italplaywright.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: interpreting semantics of ipc system call

On 09/29/2010 03:03 PM, 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.
 >
 > Could you please help me interpret the size of the data structure
 > pointed to by the
 > 'void*' or point me to documentation/code for the ipc system call?

man 2 
{ipc,msgctl,msgget,msgrcv,msgsnd,semctl,semget,semop,semtimedop,shmat,shmctl,shmdt,shmget}

Also look at the source code for the system call in ipc/syscall.c and 
the glibc sources.

David Daney

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