TRFIOFile


class description - source file - inheritance tree

class TRFIOFile : public TFile

    private:
TRFIOFile TRFIOFile() virtual Int_t SysClose(Int_t fd) virtual Int_t SysOpen(const char* pathname, Int_t flags, UInt_t mode) virtual Int_t SysRead(Int_t fd, void* buf, Int_t len) virtual Seek_t SysSeek(Int_t fd, Seek_t offset, Int_t whence) virtual Int_t SysStat(Int_t fd, Long_t* id, Long_t* size, Long_t* flags, Long_t* modtime) virtual Int_t SysSync(Int_t) virtual Int_t SysWrite(Int_t fd, const void* buf, Int_t len) public:
TRFIOFile TRFIOFile(const char* url, Option_t* option, const char* ftitle, Int_t compress = 1) virtual void ~TRFIOFile() static TClass* Class() virtual Int_t GetErrno() const virtual TClass* IsA() const virtual Bool_t ReadBuffer(char* buf, Int_t len) virtual void ResetErrno() const virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void Streamer(TBuffer& b) void StreamerNVirtual(TBuffer& b) virtual Bool_t WriteBuffer(const char* buf, Int_t len)

Data Members

    private:
TUrl fUrl URL of file Seek_t fOffset seek offet

Class Description

                                                                      
 TRFIOFile                                                            
                                                                      
 A TRFIOFile is like a normal TFile except that it reads and writes   
 its data via a rfiod server (for more on the rfiod daemon see        
 http://wwwinfo.cern.ch/pdp/serv/shift.html). TRFIOFile file names    
 are in standard URL format with protocol "rfio". The following are   
 valid TRFIOFile URL's:                                               
                                                                      
    rfio:/afs/cern.ch/user/r/rdm/galice.root                          
         where galice.root is a symlink of the type /shift/.../...    
    rfio:na49db1:/data1/raw.root                                      
                                                                      


TRFIOFile(const char *url, Option_t *option, const char *ftitle, Int_t compress) : TFile(url, "NET", ftitle, compress), fUrl(url)
 Create a RFIO file object. A RFIO file is the same as a TFile
 except that it is being accessed via a rfiod server. The url
 argument must be of the form: rfio:/path/file.root (where file.root
 is a symlink of type /shift/aaa/bbb/ccc) or rfio:server:/path/file.root.
 If the file specified in the URL does not exist, is not accessable
 or can not be created the kZombie bit will be set in the TRFIOFile
 object. Use IsZombie() to see if the file is accessable.
 For a description of the option and other arguments see the TFile ctor.
 The preferred interface to this constructor is via TFile::Open().

~TRFIOFile()
 RFIO file dtor. Close and flush directory structure.

Int_t SysOpen(const char *pathname, Int_t flags, UInt_t mode)
 Interface to system open. All arguments like in "man 2 open".

Int_t SysClose(Int_t fd)
 Interface to system close. All arguments like in "man 2 close".

Int_t SysRead(Int_t fd, void *buf, Int_t len)
 Interface to system read. All arguments like in "man 2 read".

Int_t SysWrite(Int_t fd, const void *buf, Int_t len)
 Interface to system write. All arguments like in "man 2 write".

Seek_t SysSeek(Int_t fd, Seek_t offset, Int_t whence)
 Interface to system lseek. All arguments like in "man 2 lseek"
 except that the offset and return value are Long_t to be able to
 handle 64 bit file systems.

Int_t SysStat(Int_t fd, Long_t *id, Long_t *size, Long_t *flags, Long_t *modtime)
 Interface to TSystem:GetPathInfo(). Generally implemented via
 stat() or fstat().

Bool_t ReadBuffer(char *buf, Int_t len)
 Read specified byte range from remote file via rfiod daemon.
 Returns kTRUE in case of error.

Bool_t WriteBuffer(const char *buf, Int_t len)
 Write specified byte range to remote file via rootd daemon.
 Returns kTRUE in case of error.

Int_t GetErrno() const
 Method returning rfio_errno. For RFIO files must use this
 function since we need to check rfio_errno then serrno and finally errno.

void ResetErrno() const
 Method resetting the rfio_errno, serrno and errno.



Inline Functions


              Int_t SysSync(Int_t)
          TRFIOFile TRFIOFile(const char* url, Option_t* option, const char* ftitle, Int_t compress = 1)
            TClass* Class()
            TClass* IsA() const
               void ShowMembers(TMemberInspector& insp, char* parent)
               void Streamer(TBuffer& b)
               void StreamerNVirtual(TBuffer& b)


Author: Fons Rademakers 20/01/99
Last update: root/rfio:$Name: $:$Id: TRFIOFile.cxx,v 1.22 2003/01/13 15:05:29 rdm Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *


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