Oh yes they are. Libc info for "Why Block":
Temporary blocking of signals with `sigprocmask' gives you a way to
prevent interrupts during critical parts of your code. *If signals
arrive in that part of the program, they are delivered later, after you
unblock them.*
And sigpending(2):
The sigpending call allows the examination of pending signals (ones
which have been raised while blocked). The signal mask of pending
signals is stored in set".
-- Jamie
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