Is fork() hook ever possible?

[Bob Bishop]

Hi,

On 16 Sep 2008, at 15:03, Andrey Chernov wrote:

> I need some sort of fork() hook to detect that pid is changed to re- 
> stir
> ar4random() after that (in the child), simple flag variable with
> child's pid is needed.
>
> Currently OpenBSD does almost that checking getpid() every time
> arc4random() called, but it is very slow way to use getpid() syscall
> repeatedly, about 12-15 times slower than just arc4random() without
> getpid().
>
> Any ideas?

How about something hacky using mmap()/minherit()?

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--
Bob Bishop
rb at gid.co.uk