[Devel] Re: [RFC PATCH 0/5] Resend - Use procfs to change a syscall behavior

Nadia Derbey Nadia.Derbey at bull.net
Thu Jul 10 02:14:18 PDT 2008


Paul Menage wrote:
> On Wed, Jul 9, 2008 at 11:54 PM, Nadia Derbey <Nadia.Derbey at bull.net> wrote:
> 
>>Don't you think it's simpler to specify the target fd, and then open the
>>file.
> 
> 
> Maybe. But:
> 
> - this can already be done without extra kernel support, via open()
> followed by dup2()

Sure, I completely agree with you.
Actually, that's the way it is handled in cryo code.
But I think that both ways of doing are not exactly the same in case of 
failure:
open + dup2 will close newfd if it is already busy.
while
next-syscall_data + open will fail if the target fd is already busy. And 
that's the functionality we need during restart, isn't it?

Regards,
Nadia

> 
> - if you were going to add it to the kernel, the precedent set by
> openat() is that you create a new system call that supports the
> extended semantics.
> 
> 





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