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I've added a structure, kernel-private, to represent a pending or in-delivery signal, called `ksiginfo'. It is roughly analogous to the basic information that is exported by the POSIX interface 'siginfo_t', but more basic. I've added functions to allocate these structures, and further to wrap all signal operations using them. Once the operations are wrapped, I've added a TailQ (see queue(3)) of these structures to 'struct proc', and all pending signals are in that TailQ. When a signal is being delivered, it is dequeued from the list. Once I finish the spreading of ksiginfo throughout the tree, the dequeued structure will be delivered to the process in question, whereas currently and normally, the signal number is what is used.
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