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Diffstat (limited to 'qpid/cpp/src/qpid/sys/Shlib.h')
-rw-r--r-- | qpid/cpp/src/qpid/sys/Shlib.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/sys/Shlib.h b/qpid/cpp/src/qpid/sys/Shlib.h new file mode 100644 index 0000000000..7f66cfec14 --- /dev/null +++ b/qpid/cpp/src/qpid/sys/Shlib.h @@ -0,0 +1,76 @@ +#ifndef QPID_SYS_SHLIB_H +#define QPID_SYS_SHLIB_H + +/* + * + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + * + */ + +#include "qpid/CommonImportExport.h" +#include <boost/noncopyable.hpp> +#include <iostream> + +namespace qpid { +namespace sys { + +/** Encapsulates a shared library handle. + *@see AutoShlib + */ +class Shlib { + public: + /** Load a shared library */ + Shlib(const char* libname) { load(libname); } + + /** Load a shared library */ + Shlib(const std::string& libname) { load(libname.c_str()); } + + /** Unload shared library. */ + QPID_COMMON_EXTERN void unload(); + + /** Look up symbol. */ + QPID_COMMON_EXTERN void* getSymbol(const char* symbol); + + /** Look up symbol in shared library, cast it to the desired + * pointer type, void* by default. + */ + template <class T> + T getSymbol(const char* symbol) { + // Double cast avoids warning about casting object to function pointer + return reinterpret_cast<T>(reinterpret_cast<intptr_t>( + this->getSymbol(symbol))); + } + + private: + void* handle; + QPID_COMMON_EXTERN void load(const char* libname); +}; + +/** A shared library handle that unloads the shlib in it's dtor */ +class AutoShlib : public Shlib { + public: + /** Load shared library */ + AutoShlib(const std::string& libname) : Shlib(libname) {} + /** Calls unload() */ + QPID_COMMON_EXTERN ~AutoShlib() throw(); +}; + + +}} // namespace qpid::sys + +#endif /*!QPID_SYS_SHLIB_H*/ |