signal-USR{1,2}-hook

[Dave Love]

[I reported this before, but it hasn't been fixed.]

These two hooks are documented like this:

  signal-USR1-hook's value is nil
  
  Documentation:
  Hook to be run whenever emacs receives a USR1 signal

but they aren't run on those signals.  The signals just generate
events like `[usr1-signal]'.  I don't know what is actually intended.

It is useful to be able to send such signals -- for instance to invoke
`top-level' to escape from the fairly frequent cases of
otherwise-uninterruptible loops in network processes running for Gnus
& al -- so it's probably worth documenting in the manual whatever the
behaviour is supposed to be.