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Call a plugin init function by name

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Use this macro to arrange init function ordering between friend
plugins.  Fails in the usual manner if the plugin doesn't exist, or if
the init function symbol is AWOL.

clib_error_t *
thisplug_init (vlib_main_t *vm)
{
  clib_error_t *error = 0;

  if ((error = vlib_plugin_init_function ("otherplug.so", otherplug_init)))
     return error;

  <etc>
  return error;
}
VLIB_INIT_FUNCTION(thisplug_init);

Change-Id: Ideecaf46bc0b1546e85096e54be8ddef87946565
Signed-off-by: Dave Barach <dave@barachs.net>
This commit is contained in:
Dave Barach
2017-11-18 08:43:06 -05:00
committed by Florin Coras
parent 1d6d085d35
commit cabbee7d8c
2 changed files with 29 additions and 0 deletions
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26
src/vlib/unix/plugin.h
View File

@@ -115,6 +115,32 @@ void *vlib_get_plugin_symbol (char *plugin_name, char *symbol_name);
vlib_plugin_registration_t vlib_plugin_registration \
__attribute__((__section__(".vlib_plugin_registration")))
/* Call a plugin init function: used for init function dependencies. */
#define vlib_call_plugin_init_function(vm,p,x) \
({ \
clib_error_t *(*_f)(vlib_main_t *); \
uword *_fptr = 0; \
clib_error_t * _error = 0; \
_fptr= vlib_get_plugin_symbol \
(p, CLIB_STRING_MACRO(_vlib_init_function_##x)); \
if (_fptr == 0) \
{ \
_error = clib_error_return \
(0, "Plugin %s and/or symbol %s not found.", \
p, CLIB_STRING_MACRO(_vlib_init_function_##x)); \
} \
else \
{ \
_f = (void *)(_fptr[0]); \
} \
if (_fptr && ! hash_get (vm->init_functions_called, _f)) \
{ \
hash_set1 (vm->init_functions_called, _f); \
_error = _f (vm); \
} \
_error; \
})
#endif /* __included_plugin_h__ */
/*

3
src/vppinfra/clib.h
View File

@@ -78,6 +78,9 @@
#define CLIB_PACKED(x) x __attribute__ ((packed))
#define CLIB_UNUSED(x) x __attribute__ ((unused))
/* Make a string from the macro's argument */
#define CLIB_STRING_MACRO(x) #x
#define __clib_unused __attribute__ ((unused))
#define __clib_weak __attribute__ ((weak))
#define __clib_packed __attribute__ ((packed))