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SubjectRe: Porting vfork()
> My intent in this thread was to gage the vfork() impact.  It makes no sense 
> to commit time developing a kernel solution if only a very few applications
> have such silly dependencies.

I think you can fix it in libc. Make vfork() do a clone with CLONE_VM and
leave a small gap in the stack for the parent to use.

In the client we run as before. The parent waits on a pthread mutex of some
sort which libc can clean up on exit, or exec (I belive those are the right
cases ?). I guess it needs to block all signals too.

So in theory its doable in glibc if anyone is feeling extremely clever

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