/*
* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description: 
*
*/



#ifndef SYSIF_H
#define SYSIF_H
#include <e32std.h>
#include <e32base.h>
#include <f32file.h>
#include <es_sock.h>
#include <c32comm.h>
#include <sys/select.h>
#include <spawn.h>
#include <sys/types.h>
#include <wchar.h>
#include "ipcclient.h"
#include <dirent.h>
#include <sys/socket.h>
#include <net/if.h>
#include <commdb.h>
#include <commdbconnpref.h>

/*
@internalComponent
*/
_LIT(KEstlibInit, "STDLIBS-INIT");

_LIT(KFDTransferSvr,"FDTrnsfrSvr");
//Forward declaration for references below
class RPipe;
class CFileDesTransferServer;
class RFileDesTransferSession;
class CFileDescBase;
/* TODO: We don't have to do this in CFileTable. Move to methods */
class CFileSocketDesc;

struct TChild
/*
@internalComponent
*/
	{
	TInt iFid;
	TProcessId iPid;
	RProcess iProc;
	
#ifdef __X86GCC__
	// The underlying data for a TProcessId is a TUint64. GCC raises an error if this is intialised to a negative value. Consider changing for all platforms.
	TChild(TInt aFid = -1, TProcessId aPid = 0) : iFid(aFid), iPid(aPid)
#else
	TChild(TInt aFid = -1, TProcessId aPid = -1) : iFid(aFid), iPid(aPid)
#endif //__X86GCC__
		{
		// nada
		}

#ifdef __X86GCC__
	// The underlying data for a TProcessId is a TUint64. GCC raises an error if this is intialised to a negative value. Consider changing for all platforms.
	TChild(RProcess &aProc, TProcessId aFid = 0) : iProc(aProc), iFid(aFid)
#else
	TChild(RProcess &aProc, TProcessId aFid = -1) : iProc(aProc), iFid(aFid)
#endif //__X86GCC__
		{
		iPid = aProc.Id();
		}


	static TBool MatchByFid(const TChild& aChild1, const TChild& aChild2)
		{
		if (aChild1.iFid == aChild2.iFid)
			{
			return ETrue;
			}
		return EFalse;
		}
		
	static TBool MatchByPid(const TChild& aChild1, const TChild& aChild2)
		{
		if (aChild1.iPid == aChild2.iPid)
			{
			return ETrue;
			}
		return EFalse;
		}
	};	

class TCLSICleanup
/*
@internalComponent
*/
	{
public:
	void StorePtrs(RHeap* aHeap, RFs* aFs, RSocketServ* aSs, RCommServ* aCs, RFastLock* aSsLock, RFastLock* aCsLock)
		{
		iHeap = aHeap;
		iFs = aFs;
		iSs = aSs;
		iCs = aCs;
		iSsLock = aSsLock;
		iCsLock = aCsLock;
		}

	~TCLSICleanup()
		{
		iFs->Close();
		iSs->Close();
		iSsLock->Close();
		iCs->Close();
		iCsLock->Close();
		iHeap->Close();
		}
private:
	RHeap* iHeap;
	RFs* iFs;
	RSocketServ* iSs;
	RCommServ* iCs;
	RFastLock* iSsLock;
	RFastLock* iCsLock;
	};


class TFileTableCleanup
{
public:
	void SaveUserHeap(RHeap* aHeap)
		{
		iUserHeap = aHeap;
		}

	~TFileTableCleanup()
	{
		User::SwitchHeap(iUserHeap);
	}

private:
	RHeap* iUserHeap;
};

	
class CFileTable: public CBase
/*
@internalComponent
*/
	{
public:
	CFileTable();
	~CFileTable();

	TInt Init(RHeap* aHeap = NULL);
	void Close();
	void Default(CFileDescBase* aRedirMedia, CFileDescBase* aStdErrMedia);
	TInt Reserve();
	TInt Attach(TInt aFid, CFileDescBase* aFile);
	TInt Detach(TInt aFid, CFileDescBase*& aDetached);
	TInt At(TInt aFid, CFileDescBase*& aFound) const;
	TInt Reserve(TInt aFids[3]);
	TInt Detach(TInt aFids[3]);

	int dup (int fid, int& anErrno);
	int dup2 (int fid1, int fid2, int& anErrno);
	int open (const wchar_t* name, int mode, int perms, int& anErrno);
	int close (int fid, int& anErrno);
	
	int UserClose (int fid, int& anErrno);

	int lseek (int fid, int offset, int whence, int& anErrno);
	int fstat (int fid, struct stat* st, int& anErrno);
	int socket (int family, int style, int protocol, int& anErrno, RSocketServ& aSs);
	int listen (int fd, int n, int& anErrno);
	int bind (int fd, TSockAddr& address, int& anErrno);
	int sockname (int fd, TSockAddr& address, int anEnd, int& anErrno);
	int getsockopt (int fd, int level, int opt, void* buf, unsigned long* len, int& anErrno);
	int setsockopt (int fd, int level, int opt, void* buf, unsigned long len, int& anErrno);
	int ioctlcomplete (int fid, int cmd, void* param, TRequestStatus& aStatus, int& anErrno);
	int ioctlcancel (int fid, int& anErrno);
	int fcntl (int aFid, int aCmd, long anArg, int& anErrno);

	TInt Asynch (int fid, CFileDescBase*& aFile);
	
	int popen (const wchar_t* file, const wchar_t* cmd,const char* mode, int& anErrno);
	int pclose (int aFid, int& anErrno);
	int popen3 (const wchar_t *file, const wchar_t *cmd, wchar_t** envp, int fids[3], int& anErrno);
	int system (const wchar_t* aCmd, const wchar_t* aCmdArg, int& anErrno);	
	int waitpid (int pid, int* status, int options, int& anErrno);
	
	int posix_spawn (int* pid, const wchar_t* wpath, 
					 const posix_spawn_file_actions_t* file_actions, 
					 const posix_spawnattr_t* attrp,
					 const wchar_t* wargs, wchar_t** wenvp);

	void TransferToChild (RProcess& child, TInt aFds[], TInt aWhich, TInt aSlot);
	void PassEnvToChild (RProcess& child, wchar_t** aEnvp);
	void PassFileActionsToChild (RProcess& child, 
								 const posix_spawn_file_actions_t* aFileActions);
	
	void CheckOrigins (wchar_t**& wenvp, int& aCount);
	TInt InheritFiles(CFileDesTransferServer* server);	
	int pipe (int fildes[2], int& anErrno);
	int mkfifo (const wchar_t *pathname, mode_t mode, int& anErrno, RFs& aFs);
	int CreatePipeDesc (int fildes, RPipe& aHandle, TUint16 aMode = 0);
	void ClosePipe (int fds[2], int& err);
	
	static CFileDescBase* FifoOpen (const wchar_t* pathName, mode_t mode, int perms, int& anErrno);
	int link (const wchar_t *oldpathName, const wchar_t *newpathName, int& anErrno, RFs& aFs);
	static CFileDescBase* LinkOpen (const wchar_t* pathName, mode_t mode, int perms, int& anErrno, RFs& aFs);	
	int unlink (RFs& aFs, const wchar_t *pathName, int& anErrno);
	static CFileDescBase* FileSocketOpen(int& anErrno);
	int BindFileSocket(int fid, const struct sockaddr_un* addr, int& anErrno, RFs& aFs);
	int AcceptFileSocket(CFileSocketDesc* pfs, const struct sockaddr_un* addr, int& anErrno, RFs& aFs);
	int ConnectFileSocket(int fid, const struct sockaddr_un* addr, int& anErrno, RFs& aFs);
	
	TInt RConnectionCount();
	TInt RConnectionAt (TInt aRcIndex, RConnection *&aRc);
	TInt AddRConnectionPtr (RConnection *aRc, TInt &aRcIndex);
	void RemoveRConnectionPtrAt (TInt aRcIndex);	
	void DeleteRConnectionList();
	
	CFileDesTransferServer* NewFDTransferServerL(RSemaphore &sem);
	void StartFDTransferServer(CFileDesTransferServer* pServer);
	void CloseFDTransferServer(CFileDesTransferServer* pServer);

	int SetEcho(int aFd, TUint8 aEcho, int& aErrno);
	
	void DoTransferAll(RSemaphore &sem,TDesC& name); 
	TInt GetFileCount() const
		{
		return iFids.Count();
		}
		
	void Lock()
		{
		iFidLock.Wait();
		}
	
	void Unlock()
		{
		iFidLock.Signal();
		}
	
private:
	TFileTableCleanup	iCleanup;
	CArrayPtrSeg<CFileDescBase> iFids;
	// invoked by dup
	TInt Dup(TInt aFid);
	// invoked by both dup2 and fcntl with F_DUPFD
	TInt Dup2(TInt aFid, TInt aFid2, TBool aCloseFid2);
	// the real dup-er.
    TInt DupFd(TInt aFid1, TInt aFid2);
	void Release(TInt aFid);

	//Lock for protecting FIDs across threads
	RFastLock iFidLock;
	
	//stores pids of all children of this process
	RArray<TChild> iChildren;
	
	//Methods to manipulate iChildren
	void AddChild(const TChild& aChild);
	void RemoveChild(TInt aIdx);
	
	void ExpandFTableL(TInt count);	
	
	const RArray<TChild>& GetChildren() const
		{
		return iChildren;
		}
		
	TInt FindChild(const TInt aFid) const
		{
		return iChildren.Find(TChild(aFid), 
							  TIdentityRelation<TChild>(TChild::MatchByFid));
		}
		
	TInt FindChild(const TProcessId aPid) const
		{
		return iChildren.Find(TChild(-1, aPid), 
							  TIdentityRelation<TChild>(TChild::MatchByPid));
		}

	CArrayPtrSeg<RConnection> iRConnectionList;
	//Lock for protecting iRConnectionList across threads
	RFastLock iRcLock;
	
	// A pointer to the private heap
	RHeap* iPrivateHeap;
	friend class CFileDesTransferSession;
	};


class PosixFilesystem
/*
@internalComponent
*/
	{
public:
	static wchar_t* getcwd (RFs& aFs, wchar_t* buf, unsigned long len, int& anErrno);
	static int chdir (RFs& aFs, const wchar_t* path, int& anErrno);
	static int mkdir (RFs& aFs, const wchar_t* path, int perms, int& anErrno);
	static int rmdir (RFs& aFs, const wchar_t* path, int& anErrno);
	static int chmod (RFs& aFs, const wchar_t* path, int perms, int& anErrno);
	static int reg_unlink (RFs& aFs, const wchar_t* path, int& anErrno);
	static int stat (RFs& aFs, const wchar_t* name, struct stat* st, int& anErrno);
	static int rename (RFs& aFs, const wchar_t* oldname, const wchar_t* newname, int& anErrno);
	static TInt ResolvePath (RFs& aFs, TParse& aResult, const wchar_t* path, TDes* aFilename);
	static TInt SetDefaultDir (RFs& aFs);
	static int utime (RFs& aFs, const wchar_t* name, const struct utimbuf* filetimes, int& anErrno);
	};


class TAccessPointRecord
	{
public:	
	TUint32 iId;
	TBuf<KCommsDbSvrMaxColumnNameLength> iName;
	TUint32 iDialogPref;
	TUint32 iDirection;
	TUint32 iService;
	TBuf<KCommsDbSvrMaxColumnNameLength> iServiceType;
	TUint32 iBearer;
	TBuf<KCommsDbSvrMaxColumnNameLength> iBearerType;
	TUint32 iNetwork;
	TUint32 iNetworkWeighting;
	TUint32 iLocation;
public:
	TAccessPointRecord();
	
	};

NONSHARABLE_CLASS(CLocalSystemInterface) : public CBase
/*
@internalComponent
*/
	{
public:

	
	IMPORT_C CLocalSystemInterface();
	IMPORT_C ~CLocalSystemInterface();
	
#ifdef __SYMBIAN_COMPILE_UNUSED__
	CLocalSystemInterface& Clone();
	void Release();
	void TerminateProcess(int status);
#endif //__SYMBIAN_COMPILE_UNUSED__

	int AddToDirList(DIR *aDir);
	int RemoveDirFromList(DIR* aDir);
	int FindInDirList(DIR* aDir);
	
	void Exit(int code);
	
	int dup (int fid, int& anErrno);
	int dup2 (int fid, int fid2, int& anErrno);
	int open (const wchar_t* name, int mode, int perms, int& anErrno);
	int read (int fid, char* buf, unsigned long len, int& anErrno);
	int write (int fid, const char* buf, unsigned long len, int& anErrno);
	int fsync (int fid, int& anErrno);
	int close (int fid, int& anErrno);
	int lseek (int fid, int offset, int whence, int& anErrno);
	int fstat (int fid, struct stat* st, int& anErrno);
	int ioctl (int fid, int cmd, void* param, int& anErrno);
	int ioctl (int fid, int cmd, void* param, TRequestStatus& aStatus, int& anErrno);
	int ioctl_complete (int fid, int cmd, void* param, TRequestStatus& aStatus, int& anErrno);

#ifdef __SYMBIAN_COMPILE_UNUSED__
	int ioctl_cancel (int fid, int& anErrno);
#endif //__SYMBIAN_COMPILE_UNUSED__

	wchar_t* getcwd (wchar_t* buf, unsigned long len, int& anErrno);

	int chdir (const wchar_t* path, int& anErrno);
	int mkdir (const wchar_t* path, int perms, int& anErrno);
	int rmdir (const wchar_t* path, int& anErrno);
	int chmod (const wchar_t* path, int perms, int& anErrno);	
	int stat (const wchar_t* name, struct stat* st, int& anErrno);
	int rename (const wchar_t* oldname, const wchar_t* newname, int& anErrno);

	IMPORT_C TInt ResolvePath (TParse& aResult, const wchar_t* path, TDes* aFilename);
	int socket (int family, int style, int protocol, int& anErrno);
	int recvfrom (int fd, char* buf, unsigned long cnt, int flags, struct sockaddr* from, unsigned long* fromsize, int& anErrno);
	int sendto (int fd, const char* buf, unsigned long cnt, int flags, struct sockaddr* to, unsigned long tosize, int& anErrno);
	int shutdown (int fd, int how, int& anErrno);
	int listen (int fd, int n, int& anErrno);
	int accept (int fd, struct sockaddr *addr, size_t *size, int& anErrno);
	int bind (int fd, const struct sockaddr* addr, unsigned long size, int& anErrno);
	int connect (int fd, const struct sockaddr* addr, unsigned long size, int& anErrno);
	int sockname (int fd, struct sockaddr* addr, unsigned long* size, int anEnd, int& anErrno);
	int getsockopt (int fd, int level, int opt, void* buf, unsigned long* len, int& anErrno);
	int setsockopt (int fd, int level, int opt, void* buf, unsigned long len, int& anErrno);

	int popen3 (const wchar_t *file, const wchar_t *cmd, wchar_t** envp, int fids[3], int& anErrno);
	int waitpid (int pid, int* status, int options, int& anErrno);

	int fcntl (int aFid, int aCmd, long anArg, int& anErrno);
	int utime (const wchar_t* name, const struct utimbuf* filetimes, int& anErrno);
	
	int popen (const wchar_t* file, const wchar_t* cmd, const char* mode, int& anErrno);
	int pclose (int aFid, int& anErrno);
	IMPORT_C void CheckOrigins (wchar_t**& wenvp, int& aCount);
	
    int pipe (int fildes[2], int& anErrno );
    int mkfifo (const wchar_t *pathname, mode_t mode, int& anErrno);
    int link (const wchar_t *oldpathName, const wchar_t *newpathName, int& anErrno );
    int unlink (const wchar_t *pathName, int& anErrno );
    
	int select (int maxfd, fd_set* readfds,fd_set* writefds,fd_set* exceptfds, struct timeval* tvptr, int& anErrno);
	
	int system (const wchar_t* aCmd, const wchar_t* aCmdArg, int& anErrno );
	const wchar_t* GetDirName (int aFid);
	IMPORT_C int Truncate (int aFid, int anOffset, int& anErrno);
	int fchmod (int fd , mode_t  perms, int& anErrno);
	
	int posix_spawn (int* pid, const wchar_t* wpath, 
					 const posix_spawn_file_actions_t* file_actions, 
					 const posix_spawnattr_t* attrp,
					 const wchar_t* wargs, wchar_t** wenvp);
	
	int SetEcho(int aFd, TUint8 aEcho, int& aErrno);
	
	//Set the default interface for network operations
	int setdefaultif(const struct ifreq* aIfReq);
	
	IMPORT_C CFileDescBase* GetDesc(int aFid);
	
	// functions returning session to File Server
	IMPORT_C RFs& FileSession();
    RCommServ& CommServSession();
    RSocketServ& SockServSession();

	//Dynamic Memory related APIs
	IMPORT_C void* Alloc(size_t aNBytes);
	IMPORT_C void* ReAlloc(void* aPtr, size_t aNBytes);
	IMPORT_C void Free(void* aPtr);
	IMPORT_C void* AllocTLD(TInt aSize);
	
	//Return the private Heap memory
	IMPORT_C RHeap* Heap();

	//Return the Comms Server Lock
	RFastLock& CommsSessionLock();

	//Return reference to file table
	const CFileTable& FileTable() const;
	
	//Get the default connection (RConnection) instance 
	RConnection& GetDefaultConnection();

	static void WaitForNRequest(TRequestStatus aStatusArray[], TInt aNum);

private:
	//Helper function to read a record from the IAP table
	void ReadRecordFromIapTableL(CCommsDbTableView* aView, TAccessPointRecord &aRecord);
	//Get the connection preferences from an IAP name
	TInt GetConnectionPreferencesL(TBuf<KCommsDbSvrMaxColumnNameLength> aIapName, 
			 					   TCommDbConnPref &aConnPref);
	
private:
	// NOTE: iCleanup should be the first member of CLSI, since iPrivateHeap
	// will be destroyed from within iCleanup destructor.
	TCLSICleanup	iCleanup;
	
	CFileTable 		iFids;

	RFs 			iFs;
	RSocketServ 	iSs;
	RCommServ 		iCs;
	
	//Lock for protecting Socket Session across threads
	RFastLock 		iSSLock;
	//Lock for protecting Comms Session across threads
	RFastLock 		iCSLock;

	//Private Heap which will be used by the library for all memory allocation
	RHeap* 			iPrivateHeap;
	
	//used for Opendir
	const static TInt KDirGran = 2;
	RPointerArray<TAny> iOpenDirList;

	//in class consts
	const static TInt KTLDInfoListGran = 4;
	const static TInt KPtrsGran = 2;

	//Thread-TLS pointers mapping
	class TTLDInfo
		{
	public:
		TTLDInfo(TThreadId id, TAny* ptr) : iTid(id), iPtrs(CLocalSystemInterface::KPtrsGran)
			{
			iPtrs.Append(ptr);
			}
		void Close(RHeap* pHeap)
			{
			TInt nptrs = iPtrs.Count();
			for (TInt j = 0; j < nptrs; ++j)
				{
				pHeap->Free(iPtrs[j]);
				}
			iPtrs.Close();
			}
		TThreadId iTid;
		RPointerArray<TAny> iPtrs;
		};
	
	//Array of Thread-TLS pointers mappings
	RArray<TTLDInfo> iTLDInfoList;
	
	//Protect the array from concurrent access
	RFastLock	iTLDListLock;

	//The default connection to be used for all network apis. 
	RConnection iDefConnection;
	
public:
//ipc server session
RIpcSession iIpcS;
friend class RFileDesTransferSession;
	};


/*
* Return global backend object to libraries
*/
IMPORT_C CLocalSystemInterface* Backend();




// LIBC-BACKEND specific Symbian Error Codes
const TInt KErrMaxFdOpened = -1025;
const TInt KErrDirectoryOpen = -1026;



// Directory enumeration

NONSHARABLE_STRUCT(__EPOC32_WDIR) : public CBase	// aka "class __EPOC32_WDIR with everything public"
	{
public:
	__EPOC32_WDIR() {}
	~__EPOC32_WDIR();

	TInt Open();
	TInt Open(const TDesC& aPath);
	TInt Open(const wchar_t *_path,int*);	
	virtual TInt UpdateNarrow();
	HBufC* iPath;
	CDir* iEntries;
	TInt iIndex;		// counting down, 0 means "finished"
	struct wdirent iCurrent;
	TInt iCount ;
	TBuf16<KMaxFileName> iCurrentName;
	/* *****************************************************************
	Overloading new and delete operators so that they will
	allocate and deallocare memory from/to the private heap of backend
	********************************************************************/
	inline TAny* operator new(TUint aSize, TAny* aBase) __NO_THROW
		{
		Mem::FillZ(aBase, aSize); return aBase;
		}
		
	inline TAny* operator new(TUint aSize) __NO_THROW
		{
		return Backend()->Alloc(aSize);
		}
		
	inline TAny* operator new(TUint aSize, TLeave)
		{
		TAny* ptr = Backend()->Alloc(aSize);
		if (ptr == NULL)
			{
			User::Leave(KErrNoMemory);
			}
		return ptr;
		}
		
	inline TAny* operator new(TUint aSize, TUint aExtraSize) __NO_THROW
		{
		return Backend()->Alloc(aSize + aExtraSize);
		}
		
	inline TAny* operator new(TUint aSize, TLeave, TUint aExtraSize)
		{
		TAny* ptr = Backend()->Alloc(aSize + aExtraSize);
		if (ptr == NULL)
			{
			User::Leave(KErrNoMemory);
			}
		return ptr;
		}
	
	inline void operator delete(TAny *aPtr) __NO_THROW
		{
		Backend()->Free( aPtr );
		} 
	};
	
NONSHARABLE_STRUCT(__EPOC32_DIR) : public __EPOC32_WDIR
	{
public:
	__EPOC32_DIR(){}
	~__EPOC32_DIR(){}

	virtual TInt UpdateNarrow();
	struct dirent iCurrentNarrow;
	TBuf8<KMaxFileName> iCurrentNarrowName;
	};

NONSHARABLE_STRUCT (_iconv_t) 
	{
	TUint toCode;
	TUint fromCode;
	};

class TUSockAddr : public TSockAddr
/*
Utility class for converting struct sockaddr to and from EPOC32 TSockAddr
@internalComponent
*/
	{
public:
	TUSockAddr() : TSockAddr(), iError(0) {}

	TUSockAddr(TAny* addr);			// constructor form of Prepare
	IMPORT_C TUSockAddr(const TAny* addr, TUint len);	// constructor form of Set
private:
	void Prepare(TAny* addr);
	void Set(const TAny* addr, TUint len);
public:
	IMPORT_C void Get(TAny* addr, unsigned long* len);
public:
	TInt iError; // To store error status of TUSockAddr functions, refers errno.h. Notebly not Symbian error codes.
	};
	
#endif //SYSIF_H