diff options
Diffstat (limited to 'qpid/cpp/src/qpid/broker/Daemon.h')
-rw-r--r-- | qpid/cpp/src/qpid/broker/Daemon.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/broker/Daemon.h b/qpid/cpp/src/qpid/broker/Daemon.h new file mode 100644 index 0000000000..a9cd98bce2 --- /dev/null +++ b/qpid/cpp/src/qpid/broker/Daemon.h @@ -0,0 +1,84 @@ +#ifndef _broker_Daemon_h +#define _broker_Daemon_h + +/* + * + * Copyright (c) 2006 The Apache Software Foundation + * + * Licensed 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/sys/IntegerTypes.h" +#include <boost/scoped_ptr.hpp> +#include <boost/function.hpp> +#include <boost/noncopyable.hpp> +#include <string> + + +namespace qpid { +namespace broker { + +/** + * Tools for forking and managing a daemon process. + * NB: Only one Daemon instance is allowed in a process. + */ +class Daemon : private boost::noncopyable +{ + public: + /** Check daemon is running on port, throw exception if not */ + static pid_t getPid(std::string pidDir, uint16_t port); + + Daemon(std::string pidDir); + + virtual ~Daemon(); + + /** + * Fork a daemon process. + * Call parent() in the parent process, child() in the child. + */ + void fork(); + + protected: + + /** Called in parent process */ + virtual void parent() = 0; + + /** Called in child process */ + virtual void child() = 0; + + /** Call from parent(): wait for child to indicate it is ready. + * @timeout in seconds to wait for response. + * @return port passed by child to ready(). + */ + uint16_t wait(int timeout); + + /** Call from child(): Notify the parent we are ready and write the + * PID file. + *@param port returned by parent call to wait(). + */ + void ready(uint16_t port); + + private: + static std::string pidFile(std::string pidDir, uint16_t port); + + pid_t pid; + int pipeFds[2]; + int lockFileFd; + std::string lockFile; + std::string pidDir; +}; + +}} // namespace qpid::broker + +#endif /*!_broker_Daemon_h*/ |