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SubjectRe: [RESEND][RFC PATCH v2] waitfd
New syscall should have gone to linux-api, I think.

Do we really need another one for this? How about using signalfd plus
setting the child's exit_signal to a queuing (SIGRTMIN+n) signal instead of
SIGCHLD? It's slightly more magical for the userland process to know to do
that (fork -> clone SIGRTMIN). But compared to adding a syscall we don't
really have to add, maybe better.


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