Adding a hook to list-processes

[Bob Rogers]

   I tried to do this using the patch below; it compiles without
warning, but seems to have no effect.  Evaluating the following code in
src/emacs:

        (defun rgr-list-processes-hook ()
          (message "In buffer %S" (current-buffer)))
        (add-hook 'after-list-processes-hook 'rgr-list-processes-hook)

and then "M-x list-processes RET" does not produce the expected message.
I cargo-culted this based on Qmouse_leave_buffer_hook; what did I do
wrong?  TIA,

                                        -- Bob Rogers
                                           http://www.rgrjr.com/

P.S.  FWIW, I'm trying to turn the buffer names into buttons.  Given my
C skills, using a hook seemed like a safer bet.

------------------------------------------------------------------------
diff --git a/src/process.c b/src/process.c
index f8ca095..e95d465 100644
--- a/src/process.c
+++ b/src/process.c
@@ -113,6 +113,7 @@ along with GNU Emacs.  If not, see 
<http://www.gnu.org/licenses/>.  */
 #include "nsterm.h"
 #endif
 
+Lisp_Object Vafter_list_processes_hook, Qafter_list_processes_hook;
 Lisp_Object Qeuid, Qegid, Qcomm, Qstate, Qppid, Qpgrp, Qsess, Qttname, Qtpgid;
 Lisp_Object Qminflt, Qmajflt, Qcminflt, Qcmajflt, Qutime, Qstime, Qcstime;
 Lisp_Object Qcutime, Qpri, Qnice, Qthcount, Qstart, Qvsize, Qrss, Qargs;
@@ -1493,6 +1494,11 @@ list_processes_1 (Lisp_Object query_only)
       status_notify (NULL);
       redisplay_preserve_echo_area (13);
     }
+
+  /* Give other code a chance to tweak the buffer.  */
+  if (!NILP (Vafter_list_processes_hook))
+    call1 (Vrun_hooks, Qafter_list_processes_hook);
+
   return Qnil;
 }
 
@@ -7736,6 +7742,13 @@ The variable takes effect when `start-process' is 
called.  */);
 
 #endif /* subprocesses */
 
+  Qafter_list_processes_hook = intern_c_string ("mouse-leave-buffer-hook");
+  staticpro (&Qafter_list_processes_hook);
+
+  DEFVAR_LISP ("after-list-processes-hook", &Vafter_list_processes_hook,
+              doc: /* Hook run after list-processes.  */);
+  Vafter_list_processes_hook = Qnil;
+
   defsubr (&Sget_buffer_process);
   defsubr (&Sprocess_inherit_coding_system_flag);
   defsubr (&Slist_system_processes);