/////////////////////////////////////////////////////////////////////////////
// Name:        wx/unix/private/execute.h
// Purpose:     private details of wxExecute() implementation
// Author:      Vadim Zeitlin
// Copyright:   (c) 1998 Robert Roebling, Julian Smart, Vadim Zeitlin
//              (c) 2013 Vadim Zeitlin
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_UNIX_EXECUTE_H
#define _WX_UNIX_EXECUTE_H

#include "wx/app.h"
#include "wx/process.h"

#if wxUSE_STREAMS
    #include "wx/unix/pipe.h"
    #include "wx/private/streamtempinput.h"
#endif

#include <unordered_map>

class wxEventLoopBase;

// Information associated with a running child process.
class wxExecuteData
{
public:
    wxExecuteData()
    {
        m_flags =
        m_pid = 0;
        m_exitcode = -1;

        m_process = nullptr;

        m_syncEventLoop = nullptr;

#if wxUSE_STREAMS
        m_fdOut =
        m_fdErr = wxPipe::INVALID_FD;
#endif // wxUSE_STREAMS
    }

    // This must be called in the parent process as soon as fork() returns to
    // update us with the effective child PID. It also ensures that we handle
    // SIGCHLD to be able to detect when this PID exits, so wxTheApp must be
    // available.
    void OnStart(int pid);

    // Called when the child process exits.
    void OnExit(int exitcode);

    // Return true if we should (or already did) redirect the child IO.
    bool IsRedirected() const { return m_process && m_process->IsRedirected(); }


    // wxExecute() flags
    int m_flags;

    // the pid of the child process
    int m_pid;

    // The exit code of the process, set once the child terminates.
    int m_exitcode;

    // the associated process object or nullptr
    wxProcess *m_process;

    // Local event loop used to wait for the child process termination in
    // synchronous execution case. We can't create it ourselves as its exact
    // type depends on the application kind (console/GUI), so we rely on
    // wxAppTraits setting up this pointer to point to the appropriate object.
    wxEventLoopBase *m_syncEventLoop;

#if wxUSE_STREAMS
    // the input buffer bufOut is connected to stdout, this is why it is
    // called bufOut and not bufIn
    wxStreamTempInputBuffer m_bufOut,
                            m_bufErr;

    // the corresponding FDs, -1 if not redirected
    int m_fdOut,
        m_fdErr;
#endif // wxUSE_STREAMS


private:
    // SIGCHLD signal handler that checks whether any of the currently running
    // children have exited.
    static void OnSomeChildExited(int sig);

    // All currently running child processes indexed by their PID.
    //
    // Notice that the container doesn't own its elements.
    using ChildProcessesData = std::unordered_map<int, wxExecuteData*>;
    static ChildProcessesData ms_childProcesses;

    wxDECLARE_NO_COPY_CLASS(wxExecuteData);
};

#endif // _WX_UNIX_EXECUTE_H
