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Kernel+LibC: Implement sigtimedwait()
This includes a new Thread::Blocker called SignalBlocker which blocks until a signal of a matching type is pending. The current Blocker implementation in the Kernel is very complicated, but cleaning it up is a different yak for a different day.
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@ -338,6 +338,7 @@ public:
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ErrorOr<FlatPtr> sys$sigaltstack(Userspace<const stack_t*> ss, Userspace<stack_t*> old_ss);
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ErrorOr<FlatPtr> sys$sigprocmask(int how, Userspace<const sigset_t*> set, Userspace<sigset_t*> old_set);
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ErrorOr<FlatPtr> sys$sigpending(Userspace<sigset_t*>);
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ErrorOr<FlatPtr> sys$sigtimedwait(Userspace<sigset_t const*>, Userspace<siginfo_t*>, Userspace<const timespec*>);
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ErrorOr<FlatPtr> sys$getgroups(size_t, Userspace<gid_t*>);
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ErrorOr<FlatPtr> sys$setgroups(size_t, Userspace<const gid_t*>);
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ErrorOr<FlatPtr> sys$pipe(int pipefd[2], int flags);
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