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#ifndef QPID_SYS_POSIX_FORK_H
#define QPID_SYS_POSIX_FORK_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 <sys/types.h>
namespace qpid {
namespace sys {
/**
* Fork the process. Call parent() in parent and child() in child.
*/
class Fork {
public:
Fork();
virtual ~Fork();
/**
* Fork the process.
* Calls parent() in the parent process, child() in the child.
*/
virtual void fork();
protected:
/** Called in parent process.
*@child pid of child process
*/
virtual void parent(pid_t child) = 0;
/** Called in child process */
virtual void child() = 0;
};
/**
* Like Fork but also allows the child to send a string message
* or throw an exception to the parent.
*/
class ForkWithMessage : public Fork {
public:
ForkWithMessage();
void fork();
protected:
/** Call from parent(): wait for child to send a value or throw exception.
* @timeout in seconds to wait for response.
* @return value passed by child to ready().
*/
std::string wait(int timeout);
/** Call from child(): Send a value to the parent.
*@param value returned by parent call to wait().
*/
void ready(const std::string& value);
private:
int pipeFds[2];
};
}} // namespace qpid::sys
#endif /*!QPID_SYS_POSIX_FORK_H*/
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