[Asterisk-code-review] Restrict CLI/AMI commands on shutdown. (asterisk[13])

[Mark Michelson]

Mark Michelson has uploaded a new patch set (#2).

Change subject: Restrict CLI/AMI commands on shutdown.
......................................................................

Restrict CLI/AMI commands on shutdown.

During stress testing, we have frequently seen crashes occur because a
CLI or AMI command attempts to access information that is in the process
of being destroyed.

When addressing how to fix this issue, we initially considered fixing
individual crashes we observed. However, the changes required to fix
those problems would introduce considerable overhead to the nominal
case. This is not reasonable in order to prevent a crash from occurring
while Asterisk is already shutting down.

Instead, this change makes it so AMI and CLI commands cannot be executed
if Asterisk is being shut down. For AMI, this is absolute. For CLI,
though, certain commands can be registered so that they may be run
during Asterisk shutdown.

Change-Id: I8887e215ac352fadf7f4c1e082da9089b1421990
---
M include/asterisk/cli.h
M main/asterisk.c
M main/cli.c
M main/manager.c
M main/utils.c
5 files changed, 56 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/72/2372/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I8887e215ac352fadf7f4c1e082da9089b1421990
Gerrit-PatchSet: 2
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Owner: Mark Michelson <mmichelson at digium.com>