gpg-connect-agent: Catch signals so that SIGPIPE is ignored.

* dirmngr/server.c (cmd_killdirmngr): Return 0.
* tools/gpg-connect-agent.c (main): Catch signals.
--

And we also print nicer diagnostics.  The reason we need this is that
for example "gpgconf --kill dirmngr" uses gpg-connect-agent to send a
command to dirmngr.  This may results in a SIGPIPE which in turn leads
to an annoying error message from gpgconf.

Signed-off-by: Werner Koch <wk@gnupg.org>

dirmngr/server.c

@@ -2718,7 +2718,7 @@ cmd_killdirmngr (assuan_context_t ctx, char *line)
 
   ctrl->server_local->stopme = 1;
   assuan_set_flag (ctx, ASSUAN_FORCE_CLOSE, 1);
-  return gpg_error (GPG_ERR_EOF);
+  return 0;
 }
 
 

tools/gpg-connect-agent.c

@@ -1204,6 +1204,7 @@ main (int argc, char **argv)
 
   assuan_set_gpg_err_source (0);
 
+  gnupg_init_signals (0, NULL);
 
   opt.autostart = 1;
   opt.connect_flags = 1;