Re: [RFC][PATCH] Posix Message Queues

Manfred Spraul (
Mon, 14 Jul 2003 22:16:20 +0200

Hi Michal,

You've implemented mq_open() in user space by combining open()+ioctl()
syscalls. I think it's racy:

What if two processes call
fd = mq_open("dummy",O_CREAT,0777,{.mq_maxmsg=10000});
mq_send = mq_send(fd,buf,10000,0);

I think setting the queue options and creating a new queue must be
atomic, i.e. we need a new syscall.

Could you replace the printk's with Dprintk or something like that? User
space misbehaviour such as bad pointers should not generate printk messages.


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