static AthenaTransportLinkModule *
_LoadModule(AthenaTransportLinkAdapter *athenaTransportLinkAdapter, const char *moduleName)
{
PARCArrayList *newModuleList = NULL;
// XXX need to dynamically load these, they're all hardwired for now
if (strcasecmp(moduleName, "TCP") == 0) {
newModuleList = athenaTransportLinkModuleTCP_Init();
}
if (strcasecmp(moduleName, "UDP") == 0) {
newModuleList = athenaTransportLinkModuleUDP_Init();
}
if (strcasecmp(moduleName, "ETH") == 0) {
newModuleList = athenaTransportLinkModuleETH_Init();
}
if (newModuleList) {
for (int index = 0; index < parcArrayList_Size(newModuleList); index++) {
AthenaTransportLinkModule *athenaTransportLinkModule = parcArrayList_Get(newModuleList, index);
_AddModule(athenaTransportLinkAdapter, athenaTransportLinkModule);
}
parcArrayList_Destroy(&newModuleList);
}
return _LookupModule(athenaTransportLinkAdapter, moduleName);
}
static AthenaTransportLinkModule *
_LoadModule(AthenaTransportLinkAdapter *athenaTransportLinkAdapter, const char *moduleName)
{
assertTrue(_LookupModule(athenaTransportLinkAdapter, moduleName) == NULL,
"attempt to load an already loaded module");
// Derive the entry initialization name from the provided module name
const char *moduleEntry;
moduleEntry = _moduleNameToInitMethod(moduleName);
// Check to see if the module was statically linked in.
void *linkModule = RTLD_DEFAULT;
ModuleInit _init = dlsym(linkModule, moduleEntry);
// If not statically linked in, look for a shared library and load it from there
if (_init == NULL) {
// Derive the library name from the provided module name
const char *moduleLibrary;
moduleLibrary = _moduleNameToLibrary(moduleName);
void *linkModule = dlopen(moduleLibrary, RTLD_NOW | RTLD_GLOBAL);
parcMemory_Deallocate(&moduleLibrary);
// If the shared library wasn't found, look for the symbol in our existing image. This
// allows a link module to be linked directly into Athena without modifying the forwarder.
if (linkModule == NULL) {
parcLog_Error(athenaTransportLinkAdapter_GetLogger(athenaTransportLinkAdapter),
"Unable to dlopen %s: %s", moduleName, dlerror());
parcMemory_Deallocate(&moduleEntry);
errno = ENOENT;
return NULL;
}
_init = dlsym(linkModule, moduleEntry);
if (_init == NULL) {
parcLog_Error(athenaTransportLinkAdapter_GetLogger(athenaTransportLinkAdapter),
"Unable to find %s module _init method: %s", moduleName, dlerror());
parcMemory_Deallocate(&moduleEntry);
dlclose(linkModule);
errno = ENOENT;
return NULL;
}
}
parcMemory_Deallocate(&moduleEntry);
// Call the initialization method.
PARCArrayList *moduleList = _init();
if (moduleList == NULL) { // if the init method fails, unload the module if it was loaded
parcLog_Error(athenaTransportLinkAdapter_GetLogger(athenaTransportLinkAdapter),
"Empty module list returned from %s module", moduleName);
if (linkModule != RTLD_DEFAULT) {
dlclose(linkModule);
}
errno = ENOENT;
return NULL;
}
// Process each link module instance (typically only one)
for (int index = 0; index < parcArrayList_Size(moduleList); index++) {
AthenaTransportLinkModule *athenaTransportLinkModule = parcArrayList_Get(moduleList, index);
_AddModule(athenaTransportLinkAdapter, athenaTransportLinkModule);
}
parcArrayList_Destroy(&moduleList);
return _LookupModule(athenaTransportLinkAdapter, moduleName);
}