dlsym with dlopen

Author: Vladimir Ershov

src/scheduler_mtm.c

@@ -111,7 +111,15 @@ Oid get_mtm_node_status_pkey_oid(void)
 
 bool check_mtm_compatibility(void)
 {
-	if(pg_dlsym(RTLD_DEFAULT, "MtmGetDisabledNodeMask")) return true;
+	void *hanlder;
+
+	handler = pg_dlopen(NULL, RTLD_GLOBAL);
+	if(pg_dlsym(handler, "MtmGetDisabledNodeMask"))
+	{
+		pg_dlclose(handler);
+		return true;
+	}
+	pg_dlclose(handler);
 	elog(WARNING, "The version of multimaster extension found is not compatiable with pgpro_scheduler. Pgpro_scheduler is functional but with some issues. Consider to upgrade multimaster.");
 	return false;
 }
@@ -179,9 +187,12 @@ set_state(PG_FUNCTION_ARGS)
 nodemask_t call_MtmGetDisabledNodeMask(void)
 {
 	void *ptr;
+	void *handler;
 
 	if(fptr_MtmGetDisabledNodeMask) (*fptr_MtmGetDisabledNodeMask)();
-	ptr = pg_dlsym(RTLD_DEFAULT, "MtmGetDisabledNodeMask");
+	handler = pg_dlopen(NULL, RTLD_GLOBAL);
+	ptr = pg_dlsym(handler, "MtmGetDisabledNodeMask");
+	pg_dlclose(handler);
 	if(ptr)
 	{
 		fptr_MtmGetDisabledNodeMask = (nodemask_t (*)(void))ptr;
@@ -196,9 +207,12 @@ nodemask_t call_MtmGetDisabledNodeMask(void)
 MtmNodeStatus call_MtmGetCurrentStatus(void)
 {
 	void *ptr;
+	void *handler;
 
 	if(fptr_MtmGetCurrentStatus) (*fptr_MtmGetCurrentStatus)();
-	ptr = pg_dlsym(RTLD_DEFAULT, "MtmGetCurrentStatus");
+	handler = pg_dlopen(NULL, RTLD_GLOBAL);
+	ptr = pg_dlsym(handler, "MtmGetCurrentStatus");
+	pg_close(handler);
 	if(ptr)
 	{
 		fptr_MtmGetCurrentStatus = (MtmNodeStatus (*)(void))ptr;
@@ -217,7 +231,11 @@ void call_MtmToggleDML(void)
 	void *ptr;
 
 	if(fptr_MtmToggleDML) (*fptr_MtmToggleDML)();
-	ptr = pg_dlsym(RTLD_DEFAULT, "MtmToggleDML");
+
+	handler = pg_dlopen(NULL, RTLD_GLOBAL);
+	ptr = pg_dlsym(handler, "MtmToggleDML");
+	pg_dlclose(handler);
+
 	if(ptr)
 	{
 		fptr_MtmToggleDML = (void (*)(void))ptr;