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authorDave Barach <dave@barachs.net>2017-11-18 08:43:06 -0500
committerFlorin Coras <florin.coras@gmail.com>2017-11-18 17:04:34 +0000
commitcabbee7d8caeafa3959f4559177ae335567aefb4 (patch)
treea2692a381007e78ffb87586cbd6c19521435ed36
parent1d6d085d352c8a009cca3bf62fa8975b3b44d90a (diff)
Call a plugin init function by name
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>
-rw-r--r--src/vlib/unix/plugin.h26
-rw-r--r--src/vppinfra/clib.h3
2 files changed, 29 insertions, 0 deletions
diff --git a/src/vlib/unix/plugin.h b/src/vlib/unix/plugin.h
index d9801ec439a..52da7436e61 100644
--- a/src/vlib/unix/plugin.h
+++ b/src/vlib/unix/plugin.h
@@ -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__ */
/*
diff --git a/src/vppinfra/clib.h b/src/vppinfra/clib.h
index 33db3b203f9..0d059a0778b 100644
--- a/src/vppinfra/clib.h
+++ b/src/vppinfra/clib.h
@@ -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))