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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
//************************************************************************
/**
* Class definitions for FastOS_UNIX_Process.
*
* @author Div, Oivind H. Danielsen
*/
#pragma once
#include "process.h"
#include "app.h"
#include <string>
#include <memory>
#include <future>
class FastOS_UNIX_RealProcess;
class FastOS_RingBuffer;
class FastOS_UNIX_Process : public FastOS_ProcessInterface
{
private:
FastOS_UNIX_Process(const FastOS_UNIX_Process&);
FastOS_UNIX_Process& operator=(const FastOS_UNIX_Process&);
unsigned int _pid;
bool _died;
int _returnCode;
public:
class DescriptorHandle
{
private:
DescriptorHandle(const DescriptorHandle &);
DescriptorHandle& operator=(const DescriptorHandle &);
public:
int _fd;
bool _wantRead;
bool _wantWrite;
bool _canRead;
bool _canWrite;
int _pollIdx;
std::unique_ptr<FastOS_RingBuffer> _readBuffer;
std::unique_ptr<FastOS_RingBuffer> _writeBuffer;
DescriptorHandle();
~DescriptorHandle();
void CloseHandle();
};
private:
DescriptorHandle _descriptor[4];
std::string _runDir;
std::string _stdoutRedirName;
std::string _stderrRedirName;
bool _killed;
FastOS_UNIX_ProcessStarter *GetProcessStarter () {
return static_cast<FastOS_UNIX_Application *>(_app)->GetProcessStarter();
}
bool InternalWait (int *returnCode, int timeOutSeconds, bool *pollStillRunning);
public:
enum DescriptorType
{
TYPE_STDOUT,
TYPE_STDERR,
TYPE_STDIN,
TYPE_COUNT
};
enum Constants
{
TYPE_READCOUNT = 3
};
std::unique_ptr<std::promise<void>> _closing;
FastOS_ProcessRedirectListener *GetListener (DescriptorType type)
{
if(type == TYPE_STDOUT)
return _stdoutListener;
else if(type == TYPE_STDERR)
return _stderrListener;
return nullptr;
}
void CloseListener (DescriptorType type)
{
if(type == TYPE_STDOUT)
{
if(_stdoutListener != nullptr)
{
_stdoutListener->OnReceiveData(nullptr, 0);
_stdoutListener = nullptr;
}
}
else if(type == TYPE_STDERR)
{
if(_stderrListener != nullptr)
{
_stderrListener->OnReceiveData(nullptr, 0);
_stderrListener = nullptr;
}
}
}
FastOS_UNIX_Process (const char *cmdLine, bool pipeStdin = false,
FastOS_ProcessRedirectListener *stdoutListener = nullptr,
FastOS_ProcessRedirectListener *stderrListener = nullptr,
int bufferSize = 65535);
~FastOS_UNIX_Process ();
bool CreateInternal (bool useShell);
bool Create () override { return CreateInternal(false); }
bool CreateWithShell () override { return CreateInternal(true); }
bool WriteStdin (const void *data, size_t length) override;
bool Signal(int sig);
bool Kill () override;
bool Wait (int *returnCode, int timeOutSeconds = -1) override;
bool PollWait (int *returnCode, bool *stillRunning) override;
void SetProcessId (unsigned int pid) { _pid = pid; }
unsigned int GetProcessId() override { return _pid; }
void DeathNotification (int returnCode) {
_returnCode = returnCode;
_died = true;
}
bool GetDeathFlag () { return _died; }
int BuildStreamMask (bool useShell);
void CloseDescriptor (DescriptorType type)
{
_descriptor[type].CloseHandle();
}
void SetDescriptor (DescriptorType type, int descriptor)
{
_descriptor[type]._fd = descriptor;
}
DescriptorHandle &GetDescriptorHandle(DescriptorType type)
{
return _descriptor[type];
}
bool GetKillFlag () {return _killed; }
const char *GetRunDir() const { return _runDir.c_str(); }
const char *GetStdoutRedirName() const { return _stdoutRedirName.c_str(); }
const char *GetStderrRedirName() const { return _stderrRedirName.c_str(); }
};
class FastOS_UNIX_RealProcess;
class FastOS_UNIX_ProcessStarter
{
private:
FastOS_UNIX_ProcessStarter(const FastOS_UNIX_ProcessStarter&);
FastOS_UNIX_ProcessStarter& operator=(const FastOS_UNIX_ProcessStarter&);
protected:
FastOS_ApplicationInterface *_app;
FastOS_UNIX_RealProcess *_processList;
pid_t _pid;
bool _closedProxyProcessFiles;
bool _hasDirectChildren;
void AddChildProcess (FastOS_UNIX_RealProcess *node);
void RemoveChildProcess (FastOS_UNIX_RealProcess *node);
void PollReapDirectChildren();
public:
FastOS_UNIX_ProcessStarter (FastOS_ApplicationInterface *app);
~FastOS_UNIX_ProcessStarter ();
void CloseProxiedChildDescs();
void CloseProxyDescs(int stdinPipedDes, int stdoutPipedDes, int stderrPipedDes,
int handshakeDes0, int handshakeDes1);
bool CreateProcess (FastOS_UNIX_Process *process, bool useShell,
bool pipeStdin, bool pipeStdout, bool pipeStderr);
bool Wait (FastOS_UNIX_Process *process, int timeOutSeconds, bool *pollStillRunning);
};
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