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Added support for debugging emacs daemon

From: Michael Welsh Duggan
Subject: Added support for debugging emacs daemon
Date: Tue, 12 Feb 2019 10:44:01 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

I was recently in a position where I wanted to run "emacs --daemon"
under gdb.  After a few fumbles, I hit upon the following. I suggest
either adding this or something like this to .gdbinit or mentioning it

  # Follow forks until any possible daemonization is over
  set follow-fork-mode child
  tbreak init_signals
    set follow-fork-mode parent

Mind you, init_signals is only used since it is the first emacs function
called after daemonization currently.  If things were to be moved
around, this snippet would have to change.

Michael Welsh Duggan

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