Messages in this thread | | | Date | Thu, 8 Mar 2007 15:05:20 -0800 (PST) | From | Davide Libenzi <> | Subject | Re: [patch 2/5] signalfd v2 - signalfd core ... |
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On Fri, 9 Mar 2007, Oleg Nesterov wrote:
> > Logic is, if it's not an RT signal, queue only one, otherwise multiple. > > The bit on the ->pending mask is clealer only when the queue slot becomes empty. > > Yes, I see what the code does, but I don't undestand why. For example, SIGCHLD was > delivered to the process _and_ handled several times, then sys_signalfd_dequeue() > comes and finds only one siginfo. Isn't this strange?
That's the same logic the kernel folows for non-RT signals.
> > The two trasports can rely on different masks. The signalfd_notify() does > > not even go in signalfd_deliver() if no signalfds are attached to the > > sighand. > > Sorry, I don't understand. The masks are different, yes, but ->sighand is the > same? How this can make any difference for "if no signalfds are attached" ?
The list_empty() che would not make you fall inside signalfd_deliver(), hence the fast path really lives up to its name ;)
> Also. A malicious user can eat all memory, signalfd_deliver()->kmem_cache_alloc() > doesn't check any limits.
I'll make that use the std dequeu_signal, so everything is handled in there.
- Davide
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