#ifndef ROOT_TUnixSystem
#define ROOT_TUnixSystem

//+SEQ,CopyRight,T=NOINCLUDE.

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TUnixSystem                                                          //
//                                                                      //
// Class providing an interface to the UNIX Operating System.           //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#ifndef ROOT_TSystem
//*KEEP,TSystem.
#include "TSystem.h"
//*KEND.
#endif
#ifndef ROOT_TSysEvtHandler
//*KEEP,TSysEvtHandler.
#include "TSysEvtHandler.h"
//*KEND.
#endif
#ifndef ROOT_TTimer
//*KEEP,TTimer,T=C++.
#include "TTimer.h"
//*KEND.
#endif

typedef void (*SigHandler_t)(ESignals);


class TUnixSystem : public TSystem {

protected:
   // static functions providing semi-low level interface to raw Unix
   static int          UnixMakedir(const char *name);
   static void        *UnixOpendir(const char *name);
   static const char  *UnixGetdirentry(void *dir);
   static const char  *UnixHomedirectory(const char *user = 0);
   static Long_t       UnixNow();
   static int          UnixWaitchild();
   static int          UnixSetitimer(Long_t ms);
   static int          UnixSelect(UInt_t nfds, TFdSet *readready, TFdSet *writeready,
                                  Long_t timeout);
   static void         UnixSignal(ESignals sig, SigHandler_t h);
   static const char  *UnixSigname(ESignals sig);
   static int          UnixFilestat(const char *path, Long_t *id, Long_t *size,
                                    Long_t *flags, Long_t *modtime);
   static int          UnixTcpConnect(const char *hostname, int port);
   static int          UnixUnixConnect(int port);
   static int          UnixTcpService(int port, Bool_t reuse, int backlog);
   static int          UnixUnixService(int port, int backlog);
   static int          UnixRecv(int sock, void *buf, int len, int flag);
   static int          UnixSend(int sock, const void *buf, int len, int flag);

   static const char  *GetDynamicPath();
          char        *DynamicPathName(const char *lib, Bool_t quiet = kFALSE);
   static void        *FindDynLib(const char *lib);
   static int          UnixDynLoad(const char *lib);
   static Func_t       UnixDynFindSymbol(const char *lib, const char *entry);
   static void         UnixDynUnload(const char *lib);
   static void         UnixDynListSymbols(const char *lib, const char *re = "");
   static void         UnixDynListLibs(const char *lib = "");

   static void        *SearchUtmpEntry(int nentries, const char *tty);
   static int          ReadUtmpFile();

public:
   TUnixSystem();
   virtual ~TUnixSystem();

   //---- Misc -------------------------------------------------
   Bool_t            Init();
   void              SetProgname(const char *name);
   void              SetDisplay();
   const char       *GetError();
   const char       *HostName();

   //---- EventLoop --------------------------------------------
   void              DispatchOneEvent(Bool_t pendingOnly = kFALSE);

   //---- Handling of system events ----------------------------
   void              CheckChilds();
   Bool_t            CheckSignals(Bool_t sync);
   void              DispatchSignals(ESignals sig);
   void              AddSignalHandler(TSignalHandler *sh);
   TSignalHandler   *RemoveSignalHandler(TSignalHandler *sh);
   void              AddFileHandler(TFileHandler *fh);
   TFileHandler     *RemoveFileHandler(TFileHandler *fh);
   void              IgnoreInterrupt(Bool_t ignore = kTRUE);

   //---- Time & Date ------------------------------------------
   TTime             Now();
   void              AddTimer(TTimer *ti);
   TTimer           *RemoveTimer(TTimer *ti);
   void              ResetTimer(TTimer *ti);
   Bool_t            DispatchTimers(Bool_t mode);
   void              Sleep(UInt_t milliSec);

   //---- Processes --------------------------------------------
   int               Exec(const char *shellcmd);
   FILE             *OpenPipe(const char *shellcmd, const char *mode);
   int               ClosePipe(FILE *pipe);
   void              Exit(int code, Bool_t mode = kTRUE);
   void              Abort(int code = 0);
   int               GetPid();
   void              StackTrace();

   //---- Environment Manipulation -----------------------------
   const char       *Getenv(const char *name);
   void              Setenv(const char *name, const char *value);

   //---- Directories ------------------------------------------
   int               MakeDirectory(const char *name);
   void             *OpenDirectory(const char *name);
   void              FreeDirectory(void *dirp);
   const char       *GetDirEntry(void *dirp);
   Bool_t            ChangeDirectory(const char *path);
   const char       *WorkingDirectory();
   const char       *HomeDirectory(const Char_t *userName = 0);

   //---- Paths & Files ----------------------------------------
   char             *ConcatFileName(const char *dir, const char *name);
   Bool_t            ExpandPathName(TString &patbuf);
   char             *ExpandPathName(const char *path);
   Bool_t            AccessPathName(const char *path, EAccessMode mode = kFileExists);
   void              Rename(const char *from, const char *to);
   int               Link(const char *from, const char *to);
   int               Symlink(const char *from, const char *to);
   int               Unlink(const char *name);
   int               GetPathInfo(const char *path, Long_t *id,Long_t *size,
                                 Long_t *flags, Long_t *modtime);
   int               Umask(Int_t mask);
   char             *Which(const char *search, const char *file, EAccessMode mode = kFileExists);

   //---- System Logging ---------------------------------------
   void              Openlog(const char *name, Int_t options, ELogFacility facility);
   void              Syslog(ELogLevel level, const char *mess);
   void              Closelog();

   //---- Dynamic Loading --------------------------------------
   Func_t            DynFindSymbol(const char *module, const char *entry);
   int               Load(const char *module, const char *entry = "", Bool_t system = kFALSE);
   void              Unload(const char *module);
   void              ListSymbols(const char *module, const char *re = "");
   void              ListLibraries(const char *regexp = "");

   //---- RPC --------------------------------------------------
   TInetAddress      GetHostByName(const char *server);
   TInetAddress      GetPeerName(int sock);
   TInetAddress      GetSockName(int sock);
   int               GetServiceByName(const char *service);
   char             *GetServiceByPort(int port);
   int               ConnectService(const char *server, int port);
   int               OpenConnection(const char *server, int port);
   int               AnnounceTcpService(int port, Bool_t reuse, int backlog);
   int               AnnounceUnixService(int port, int backlog);
   int               AcceptConnection(int sock);
   void              CloseConnection(int sock);
   int               RecvRaw(int sock, void *buffer, int length, int flag);
   int               SendRaw(int sock, const void *buffer, int length, int flag);
   int               RecvBuf(int sock, void *buffer, int length);
   int               SendBuf(int sock, const void *buffer, int length);
   int               SetSockOpt(int sock, int option, int val);
   int               GetSockOpt(int sock, int option, int *val);

   ClassDef(TUnixSystem,0)  //Interface to Unix OS services
};

#endif