1
/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
4
* Licensed under the Apache License, Version 2.0 (the "License");
5
* you may not use this file except in compliance with the License.
6
* You may obtain a copy of the License at
8
* http://www.apache.org/licenses/LICENSE-2.0
10
* Unless required by applicable law or agreed to in writing, software
11
* distributed under the License is distributed on an "AS IS" BASIS,
12
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13
* See the License for the specific language governing permissions and
14
* limitations under the License.
21
/* For apr_array_header_t */
22
#include "apr_tables.h"
26
* @brief Apache hook functions
33
* @defgroup APR_Util_Hook Hook Functions
37
/** macro to return the prototype of the hook function */
38
#define APR_IMPLEMENT_HOOK_GET_PROTO(ns,link,name) \
39
link##_DECLARE(apr_array_header_t *) ns##_hook_get_##name(void)
41
/** macro to declare the hook correctly */
42
#define APR_DECLARE_EXTERNAL_HOOK(ns,link,ret,name,args) \
43
typedef ret ns##_HOOK_##name##_t args; \
44
link##_DECLARE(void) ns##_hook_##name(ns##_HOOK_##name##_t *pf, \
45
const char * const *aszPre, \
46
const char * const *aszSucc, int nOrder); \
47
link##_DECLARE(ret) ns##_run_##name args; \
48
APR_IMPLEMENT_HOOK_GET_PROTO(ns,link,name); \
49
typedef struct ns##_LINK_##name##_t \
51
ns##_HOOK_##name##_t *pFunc; \
53
const char * const *aszPredecessors; \
54
const char * const *aszSuccessors; \
56
} ns##_LINK_##name##_t;
58
/** macro to declare the hook structure */
59
#define APR_HOOK_STRUCT(members) \
60
static struct { members } _hooks;
62
/** macro to link the hook structure */
63
#define APR_HOOK_LINK(name) \
64
apr_array_header_t *link_##name;
66
/** macro to implement the hook */
67
#define APR_IMPLEMENT_EXTERNAL_HOOK_BASE(ns,link,name) \
68
link##_DECLARE(void) ns##_hook_##name(ns##_HOOK_##name##_t *pf,const char * const *aszPre, \
69
const char * const *aszSucc,int nOrder) \
71
ns##_LINK_##name##_t *pHook; \
72
if(!_hooks.link_##name) \
74
_hooks.link_##name=apr_array_make(apr_hook_global_pool,1,sizeof(ns##_LINK_##name##_t)); \
75
apr_hook_sort_register(#name,&_hooks.link_##name); \
77
pHook=apr_array_push(_hooks.link_##name); \
79
pHook->aszPredecessors=aszPre; \
80
pHook->aszSuccessors=aszSucc; \
81
pHook->nOrder=nOrder; \
82
pHook->szName=apr_hook_debug_current; \
83
if(apr_hook_debug_enabled) \
84
apr_hook_debug_show(#name,aszPre,aszSucc); \
86
APR_IMPLEMENT_HOOK_GET_PROTO(ns,link,name) \
88
return _hooks.link_##name; \
92
* Implement a hook that has no return code, and therefore runs all of the
93
* registered functions
94
* @param ns The namespace prefix of the hook functions
95
* @param link The linkage declaration prefix of the hook
96
* @param name The name of the hook
97
* @param args_decl The declaration of the arguments for the hook
98
* @param args_use The names for the arguments for the hook
99
* @note The link prefix FOO corresponds to FOO_DECLARE() macros, which
100
* provide export linkage from the module that IMPLEMENTs the hook, and
101
* import linkage from external modules that link to the hook's module.
103
#define APR_IMPLEMENT_EXTERNAL_HOOK_VOID(ns,link,name,args_decl,args_use) \
104
APR_IMPLEMENT_EXTERNAL_HOOK_BASE(ns,link,name) \
105
link##_DECLARE(void) ns##_run_##name args_decl \
107
ns##_LINK_##name##_t *pHook; \
110
if(!_hooks.link_##name) \
113
pHook=(ns##_LINK_##name##_t *)_hooks.link_##name->elts; \
114
for(n=0 ; n < _hooks.link_##name->nelts ; ++n) \
115
pHook[n].pFunc args_use; \
118
/* FIXME: note that this returns ok when nothing is run. I suspect it should
119
really return decline, but that breaks Apache currently - Ben
122
* Implement a hook that runs until one of the functions returns something
123
* other than OK or DECLINE
124
* @param ns The namespace prefix of the hook functions
125
* @param link The linkage declaration prefix of the hook
126
* @param ret Type to return
127
* @param name The name of the hook
128
* @param args_decl The declaration of the arguments for the hook
129
* @param args_use The names for the arguments for the hook
130
* @param ok Success value
131
* @param decline Decline value
132
* @note The link prefix FOO corresponds to FOO_DECLARE() macros, which
133
* provide export linkage from the module that IMPLEMENTs the hook, and
134
* import linkage from external modules that link to the hook's module.
136
#define APR_IMPLEMENT_EXTERNAL_HOOK_RUN_ALL(ns,link,ret,name,args_decl,args_use,ok,decline) \
137
APR_IMPLEMENT_EXTERNAL_HOOK_BASE(ns,link,name) \
138
link##_DECLARE(ret) ns##_run_##name args_decl \
140
ns##_LINK_##name##_t *pHook; \
144
if(!_hooks.link_##name) \
147
pHook=(ns##_LINK_##name##_t *)_hooks.link_##name->elts; \
148
for(n=0 ; n < _hooks.link_##name->nelts ; ++n) \
150
rv=pHook[n].pFunc args_use; \
152
if(rv != ok && rv != decline) \
160
* Implement a hook that runs until the first function returns something
161
* other than the value of decline
162
* @param ns The namespace prefix of the hook functions
163
* @param link The linkage declaration prefix of the hook
164
* @param name The name of the hook
165
* @param ret Type to return
166
* @param args_decl The declaration of the arguments for the hook
167
* @param args_use The names for the arguments for the hook
168
* @param decline Decline value
169
* @note The link prefix FOO corresponds to FOO_DECLARE() macros, which
170
* provide export linkage from the module that IMPLEMENTs the hook, and
171
* import linkage from external modules that link to the hook's module.
173
#define APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST(ns,link,ret,name,args_decl,args_use,decline) \
174
APR_IMPLEMENT_EXTERNAL_HOOK_BASE(ns,link,name) \
175
link##_DECLARE(ret) ns##_run_##name args_decl \
177
ns##_LINK_##name##_t *pHook; \
181
if(!_hooks.link_##name) \
184
pHook=(ns##_LINK_##name##_t *)_hooks.link_##name->elts; \
185
for(n=0 ; n < _hooks.link_##name->nelts ; ++n) \
187
rv=pHook[n].pFunc args_use; \
196
/** run this hook first, before ANYTHING */
197
#define APR_HOOK_REALLY_FIRST (-10)
198
/** run this hook first */
199
#define APR_HOOK_FIRST 0
200
/** run this hook somewhere */
201
#define APR_HOOK_MIDDLE 10
202
/** run this hook after every other hook which is defined*/
203
#define APR_HOOK_LAST 20
204
/** run this hook last, after EVERYTHING */
205
#define APR_HOOK_REALLY_LAST 30
208
* The global pool used to allocate any memory needed by the hooks.
210
APU_DECLARE_DATA extern apr_pool_t *apr_hook_global_pool;
213
* A global variable to determine if debugging information about the
214
* hooks functions should be printed
216
APU_DECLARE_DATA extern int apr_hook_debug_enabled;
219
* The name of the module that is currently registering a function
221
APU_DECLARE_DATA extern const char *apr_hook_debug_current;
224
* Register a hook function to be sorted
225
* @param szHookName The name of the Hook the function is registered for
226
* @param aHooks The array which stores all of the functions for this hook
228
APU_DECLARE(void) apr_hook_sort_register(const char *szHookName,
229
apr_array_header_t **aHooks);
231
* Sort all of the registerd functions for a given hook
233
APU_DECLARE(void) apr_hook_sort_all(void);
236
* Print all of the information about the current hook. This is used for
237
* debugging purposes.
238
* @param szName The name of the hook
239
* @param aszPre All of the functions in the predecessor array
240
* @param aszSucc All of the functions in the successor array
242
APU_DECLARE(void) apr_hook_debug_show(const char *szName,
243
const char * const *aszPre,
244
const char * const *aszSucc);
247
* Remove all currently registered functions.
249
APU_DECLARE(void) apr_hook_deregister_all(void);
256
#endif /* APR_HOOKS_H */