I've seen comments in the Bionic source code to the effect that
real-time signals aren't supported (IIUIC, they also need kernel
support, which may not be there).
If all you want are *two* signals, then you may be able to use SIGUSR1
and SIGUSR2 for instead.
--
┌─── dg@cowlark.com ───── http://www.cowlark.com ─────
│
│ ⍎'⎕',∊N⍴⊂S←'←⎕←(3=T)⋎M⋏2=T←⊃+/(V⌽"⊂M),(V⊝"M),(V,⌽V)⌽"(V,V←1⎺1)⊝"⊂M)'
│ --- Conway's Game Of Life, in one line of APL
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