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func_periodic_hook.c: Cleanup module resources on failure.

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* Make load_module() cleanup if it failed to setup the module.

* Make unload_module() always return 0.  It is silly to fail unloading if
the hook function we try to unregister was not even registered.

Change-Id: I280fc6e8ba2a7ee2588ca01d870eebaf74b4ffe6
This commit is contained in:
Richard Mudgett
2018-10-04 13:13:24 -05:00
parent 1311aeecfb
commit 69d62b5d04
1 changed files with 17 additions and 13 deletions
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30
funcs/func_periodic_hook.c
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@@ -450,7 +450,8 @@ static int unload_module(void)
{
ast_context_destroy(NULL, AST_MODULE);
return ast_custom_function_unregister(&hook_function);
ast_custom_function_unregister(&hook_function);
return 0;
}
static int load_module(void)
@@ -465,37 +466,40 @@ static int load_module(void)
/*
* Based on a handy recipe from the Asterisk Cookbook.
*/
ast_add_extension(context_name, 1, exten_name, 1, "", "",
res = ast_add_extension(context_name, 1, exten_name, 1, "", "",
"Set", "EncodedChannel=${CUT(HOOK_CHANNEL,-,1-2)}",
NULL, AST_MODULE);
ast_add_extension(context_name, 1, exten_name, 2, "", "",
res |= ast_add_extension(context_name, 1, exten_name, 2, "", "",
"Set", "GROUP_NAME=${EncodedChannel}${HOOK_ID}",
NULL, AST_MODULE);
ast_add_extension(context_name, 1, exten_name, 3, "", "",
res |= ast_add_extension(context_name, 1, exten_name, 3, "", "",
"Set", "GROUP(periodic-hook)=${GROUP_NAME}",
NULL, AST_MODULE);
ast_add_extension(context_name, 1, exten_name, 4, "", "", "ExecIf",
res |= ast_add_extension(context_name, 1, exten_name, 4, "", "", "ExecIf",
"$[${GROUP_COUNT(${GROUP_NAME}@periodic-hook)} > 1]?Hangup()",
NULL, AST_MODULE);
ast_add_extension(context_name, 1, exten_name, 5, "", "",
res |= ast_add_extension(context_name, 1, exten_name, 5, "", "",
"Set", "ChannelToSpy=${URIDECODE(${EncodedChannel})}",
NULL, AST_MODULE);
ast_add_extension(context_name, 1, exten_name, 6, "", "",
res |= ast_add_extension(context_name, 1, exten_name, 6, "", "",
"ChanSpy", "${ChannelToSpy},qEB", NULL, AST_MODULE);
res = ast_add_extension(context_name, 1, beep_exten, 1, "", "",
res |= ast_add_extension(context_name, 1, beep_exten, 1, "", "",
"Answer", "", NULL, AST_MODULE);
res |= ast_add_extension(context_name, 1, beep_exten, 2, "", "",
"Playback", "beep", NULL, AST_MODULE);
res = ast_custom_function_register_escalating(&hook_function, AST_CFE_BOTH);
res |= ast_custom_function_register_escalating(&hook_function, AST_CFE_BOTH);
if (!res) {
/* For Optional API. */
ast_module_shutdown_ref(ast_module_info->self);
if (res) {
unload_module();
return AST_MODULE_LOAD_DECLINE;
}
return res ? AST_MODULE_LOAD_DECLINE : AST_MODULE_LOAD_SUCCESS;
/* For Optional API. */
ast_module_shutdown_ref(ast_module_info->self);
return AST_MODULE_LOAD_SUCCESS;
}
int AST_OPTIONAL_API_NAME(ast_beep_start)(struct ast_channel *chan,