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Fix load errors related to the new ari_model_validators.

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The Asterisk strategy of loading modules with RTLD_LAZY to extract metadata
from the module works well enough, until you try to take the address of a
function.

If a module takes the address of a function, that function needs to be
resolved at load time. That kinda defeats RTLD_LAZY.

This patch adds some ari_validator_{id}_fn() wrapper functions for safely
getting the function pointer from a different module.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@393576 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
David M. Lee
2013-07-03 19:46:50 +00:00
parent ef032842f1
commit dbc588b02f
11 changed files with 438 additions and 10 deletions
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23
rest-api-templates/ari_model_validators.h.mustache
View File

@@ -17,6 +17,17 @@
/*! \file
*
* \brief Generated file - Build validators for ARI model objects.
*
* In addition to the normal validation functions one would normally expect,
* each validator has a ari_validate_{id}_fn() companion function that returns
* the validator's function pointer.
*
* The reason for this seamingly useless indirection is the way function
* pointers interfere with module loading. Asterisk attempts to dlopen() each
* module using \c RTLD_LAZY in order to read some metadata from the module.
* Unfortunately, if you take the address of a function, the function has to be
* resolvable at load time, even if \c RTLD_LAZY is specified. By moving the
* function-address-taking into this module, we can once again be lazy.
*/
/*
@@ -124,6 +135,11 @@ int ari_validate_date(struct ast_json *json);
int ari_validate_list(struct ast_json *json, int (*fn)(struct ast_json *));
/*! @} */
/*!
* \brief Function type for validator functions. Allows for
*/
typedef int (*ari_validator)(struct ast_json *json);
{{#apis}}
{{#api_declaration}}
{{#models}}
@@ -138,6 +154,13 @@ int ari_validate_list(struct ast_json *json, int (*fn)(struct ast_json *));
* \returns False (zero) if invalid.
*/
int ari_validate_{{c_id}}(struct ast_json *json);
/*!
* \brief Function pointer to ari_validate_{{c_id}}().
*
* See \ref ari_model_validators.h for more details.
*/
ari_validator ari_validate_{{c_id}}_fn(void);
{{/models}}
{{/api_declaration}}
{{/apis}}