/// \file procs.h
/// Contains generic function headers for managing processes.

#pragma once
#include <unistd.h>
#include <string>
#include <set>
#include <vector>
#include <deque>
#include "tinythread.h"

/// Contains utility code, not directly related to streaming media
namespace Util {

  /// Deals with spawning, monitoring and stopping child processes
  class Procs {
    private:
      static tthread::mutex plistMutex;
      static std::set<pid_t> plist; ///< Holds active process list.
      static bool thread_handler;///< True while thread handler should be running.
      static void childsig_handler(int signum);
      static void exit_handler();
      static char* const* dequeToArgv(std::deque<std::string> & argDeq);
      static void grim_reaper(void * n);
    public:
      static bool childRunning(pid_t p);
      static tthread::thread * reaper_thread;
      static bool handler_set; ///< If true, the sigchld handler has been setup.
      static void setHandler();
      static std::string getOutputOf(char * const * argv);
      static std::string getOutputOf(std::deque<std::string> & argDeq);
      static pid_t StartPiped(const char * const * argv, int * fdin, int * fdout, int * fderr);
      static pid_t StartPiped(std::deque<std::string> & argDeq, int * fdin, int * fdout, int * fderr);
      static void Stop(pid_t name);
      static void Murder(pid_t name);
      static void StopAll();
      static int Count();
      static bool isActive(pid_t name);
      static bool isRunning(pid_t pid);
      static void forget(pid_t pid);
      static void remember(pid_t pid);
      static std::set<int> socketList; ///< Holds sockets that should be closed before forking
  };
}