process_spawn.h

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// Copyright (C) 2015-2021 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef PROCESS_SPAWN_H
#define PROCESS_SPAWN_H

#include <asiolink/io_service.h>
#include <exceptions/exceptions.h>
#include <boost/noncopyable.hpp>
#include <string>
#include <sys/types.h>
#include <vector>
#include <boost/shared_ptr.hpp>

namespace isc {
namespace asiolink {

class ProcessSpawnError : public Exception {
public:
    ProcessSpawnError(const char* file, size_t line, const char* what) :
        isc::Exception(file, line, what) { };
};

class ProcessSpawnImpl;

typedef boost::shared_ptr<ProcessSpawnImpl> ProcessSpawnImplPtr;

typedef std::vector<std::string> ProcessArgs;

typedef std::vector<std::string> ProcessEnvVars;

class ProcessSpawn : boost::noncopyable {
public:

    ProcessSpawn(isc::asiolink::IOServicePtr io_service,
                 const std::string& executable,
                 const ProcessArgs& args = ProcessArgs(),
                 const ProcessEnvVars& vars = ProcessEnvVars());

    ~ProcessSpawn() = default;

    std::string getCommandLine() const;

    pid_t spawn(bool dismiss = false);

    bool isRunning(const pid_t pid) const;

    bool isAnyRunning() const;

    int getExitStatus(const pid_t pid) const;

    void clearState(const pid_t pid);

private:

    ProcessSpawnImplPtr impl_;
};

} // namespace asiolink
} // namespace isc

#endif // PROCESS_SPAWN_H