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Diffstat (limited to 'cpp/lib/broker/Daemon.h')
-rw-r--r-- | cpp/lib/broker/Daemon.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/cpp/lib/broker/Daemon.h b/cpp/lib/broker/Daemon.h new file mode 100644 index 0000000000..cf9bf13764 --- /dev/null +++ b/cpp/lib/broker/Daemon.h @@ -0,0 +1,91 @@ +#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 <string> +#include <boost/scoped_ptr.hpp> + +namespace qpid { +namespace broker { + +/** + * Tools for forking and managing a daemon process. + * NB: Only one Daemon instance is allowed in a process. + */ +class Daemon +{ + public: + + /** Extract the daemon's name from argv[0] */ + static std::string nameFromArgv0(const char* argv0); + + /** + * Creating a Daemon instance forks a daemon process. + *@param name used to create pid files etc. + *@param timeout in seconds for all operations that wait. + */ + Daemon(const std::string& name, int timeout); + + ~Daemon(); + + /** Fork the daemon, wait till it signals readiness */ + pid_t fork(); + + /** Child only, send ready signal so parent fork() will return. */ + void ready(); + + /** Child only, send failed signal so parent fork() will throw. */ + void failed(); + + /** Kill the daemon with SIGINT. */ + void quit(); + + /** Kill the daemon with SIGKILL. */ + void kill(); + + /** Check daemon is running, throw exception if not */ + pid_t check(); + + bool isParent() { return pid > 0; } + + bool isChild() { return pid == 0; } + + std::string getName() const { return name; } + + pid_t getPid() const {return pid; } + + private: + class Retval; + + void notify(int); + + static std::string name; + static std::string pidFile; + static const char* getPidFile(); + boost::scoped_ptr<Retval> retval; + pid_t pid; + int timeout; +}; + +}} // namespace qpid::broker + + + +#endif /*!_broker_Daemon_h*/ |