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give embedded modules a helping hand by backing up and restoring their global variables when they are loaded and unloaded

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@56092 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2007-02-22 02:36:00 +00:00
parent a6cbe5d651
commit 1bec2f5bfa
5 changed files with 143 additions and 5 deletions
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73
include/asterisk/module.h
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@@ -192,6 +192,8 @@ struct ast_module_info {
enum ast_module_load_result (*load)(void); /* register stuff etc. Optional. */
int (*reload)(void); /* config etc. Optional. */
int (*unload)(void); /* unload. called with the module locked */
int (*backup_globals)(void); /* for embedded modules, backup global data */
void (*restore_globals)(void); /* for embedded modules, restore global data */
const char *name; /* name of the module for loader reference and CLI commands */
const char *description; /* user friendly description of the module. */
@@ -253,6 +255,75 @@ void ast_module_unref(struct ast_module *);
and populated at the end of the module's source file... */
const static __attribute__((unused)) struct ast_module_info *ast_module_info;
#if defined(EMBEDDED_MODULE)
#define make_var_sub(mod, type) __ ## mod ## _ ## type
#define make_var(mod, type) make_var_sub(mod, type)
extern void make_var(EMBEDDED_MODULE, bss_start);
extern void make_var(EMBEDDED_MODULE, bss_end);
extern void make_var(EMBEDDED_MODULE, data_start);
extern void make_var(EMBEDDED_MODULE, data_end);
static void * __attribute__((section(".embed_module"))) __global_backup;
static int __backup_globals(void)
{
size_t data_size = & make_var(EMBEDDED_MODULE, data_end) - & make_var(EMBEDDED_MODULE, data_start);
if (__global_backup)
return 0;
if (!data_size)
return 0;
if (!(__global_backup = ast_malloc(data_size)))
return -1;
memcpy(__global_backup, & make_var(EMBEDDED_MODULE, data_start), data_size);
return 0;
}
static void __restore_globals(void)
{
size_t data_size = & make_var(EMBEDDED_MODULE, data_end) - & make_var(EMBEDDED_MODULE, data_start);
size_t bss_size = & make_var(EMBEDDED_MODULE, bss_end) - & make_var(EMBEDDED_MODULE, bss_start);
if (bss_size)
memset(& make_var(EMBEDDED_MODULE, bss_start), 0, bss_size);
if (!data_size || !__global_backup)
return;
memcpy(& make_var(EMBEDDED_MODULE, data_start), __global_backup, data_size);
}
#define AST_MODULE_INFO(keystr, flags_to_set, desc, fields...) \
static struct ast_module_info __mod_info = { \
.backup_globals = __backup_globals, \
.restore_globals = __restore_globals, \
.name = AST_MODULE, \
.flags = flags_to_set, \
.description = desc, \
.key = keystr, \
fields \
}; \
static void __attribute__ ((constructor)) __reg_module(void) \
{ \
ast_module_register(&__mod_info); \
} \
static void __attribute__ ((destructor)) __unreg_module(void) \
{ \
ast_module_unregister(&__mod_info); \
} \
const static struct ast_module_info *ast_module_info = &__mod_info
#undef make_var
#undef make_var_sub
#else /* !defined(EMBEDDED_MODULE) */
#define AST_MODULE_INFO(keystr, flags_to_set, desc, fields...) \
static struct ast_module_info __mod_info = { \
.name = AST_MODULE, \
@@ -271,6 +342,8 @@ const static __attribute__((unused)) struct ast_module_info *ast_module_info;
} \
const static struct ast_module_info *ast_module_info = &__mod_info
#endif /* !defined(EMBEDDED_MODULE) */
#define AST_MODULE_INFO_STANDARD(keystr, desc) \
AST_MODULE_INFO(keystr, AST_MODFLAG_DEFAULT, desc, \
.load = load_module, \