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res_musiconhold: Add kill_escalation_delay, kill_method to class

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By default, when res_musiconhold reloads or unloads, it sends a HUP
signal to custom applications (and all descendants), waits 100ms,
then sends a TERM signal, waits 100ms, then finally sends a KILL
signal.  An application which is interacting with an external
device and/or spawns children of its own may not be able to exit
cleanly in the default times, expecially if sent a KILL signal, or
if it's children are getting signals directly from
res_musiconhoild.

* To allow extra time, the 'kill_escalation_delay'
  class option can be used to set the number of milliseconds
  res_musiconhold waits before escalating kill signals, with the
  default being the current 100ms.

* To control to whom the signals are sent, the "kill_method" class
  option can be set to "process_group" (the default, existing
  behavior), which sends signals to the application and its
  descendants directly, or "process" which sends signals only to the
  application itself.

Change-Id: Iff70a1a9405685a9021a68416830c0db5158603b
This commit is contained in:
George Joseph
2017-07-11 06:26:27 -06:00
parent 1498d66f69
commit 4e555437dc
3 changed files with 123 additions and 49 deletions
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23
configs/samples/musiconhold.conf.sample
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@@ -91,3 +91,26 @@ directory=moh
;mode=custom
;directory=/var/lib/asterisk/mohmp3
;application=/site/sw/bin/madplay -Q -o raw:- --mono -R 8000 -a -12
; By default, when res_musiconhold reloads or unloads, it sends a HUP signal
; to custom applications (and all descendants), waits 100ms, then sends a
; TERM signal, waits 100ms, then finally sends a KILL signal. An application
; which is interacting with an external device and/or spawns children of its
; own may not be able to exit cleanly in the default times, expecially if sent
; a KILL signal, or if it's children are getting signals directly from
; res_musiconhoild. To allow extra time, the 'kill_escalation_delay'
; class option can be used to set the number of milliseconds res_musiconhold
; waits before escalating kill signals, with the default being the current
; 100ms. To control to whom the signals are sent, the "kill_method"
; class option can be set to "process_group" (the default, existing behavior),
; which sends signals to the application and its descendants directly, or
; "process" which sends signals only to the application itself.
;[sox_from_device]
;mode=custom
;directory=/var/lib/asterisk/mohmp3
;application=/usr/bin/sox -q -t alsa -c 2 -r 48000 hw:1 -c 1 -r 8000 -t raw -s -
; Wait 500ms before escalating kill signals
;kill_escalation_delay=500
; Send signals to just the child process instead of all descendants
;kill_method=process