TNetFile
class description - source file - inheritance tree
private:
TNetFile TNetFile()
Bool_t Authenticate()
Bool_t CheckNetrc(char*& user, char*& passwd)
char* GetPasswd()
char* GetUser()
void Init(Bool_t create)
virtual void Print(Option_t* option)
void PrintError(char* where, Int_t err)
Int_t Recv(Int_t& status, EMessageTypes& kind)
public:
TNetFile TNetFile(char* url, Option_t* option, Text_t* ftitle, Int_t compress = 1)
virtual void ~TNetFile()
TClass* Class()
virtual void Close(Option_t* option)
virtual void Flush()
virtual TClass* IsA()
virtual Bool_t IsOpen()
virtual Bool_t ReadBuffer(char* buf, int len)
virtual void Seek(Seek_t offset, TFile::ERelativeTo pos = kBeg)
void SetPasswd(char* passwd)
void SetUser(char* user)
virtual void ShowMembers(TMemberInspector& insp, char* parent)
virtual void Streamer(TBuffer& b)
virtual Bool_t WriteBuffer(char* buf, int len)
private:
TUrl fUrl URL of file
TString fUser remote user name
Seek_t fOffset seek offset
TSocket* fSocket connection to rootd server
static char* fgUser
static char* fgPasswd
TNetFile
A TNetFile is like a normal TFile except that it reads and writes
its data via a rootd server (for more on the rootd daemon see the
source files ROOTD_*.cxx). TNetFile file names are in standard URL
format with protocol "root". The following are valid TNetFile URL's:
root://hpsalo/files/aap.root
root://hpbrun.cern.ch/root/hsimple.root
root://pcna49a:5151/~na49/data/run821.root
root://pcna49d.cern.ch:5050//v1/data/run810.root
The only difference with the well known httpd URL's is that the root
of the remote file tree is the user's home directory. Therefore an
absolute pathname requires a // after the host or port specifier
(see last example). Further the expansion of the standard shell
characters, like ~, $, .., are handled as expected.
TNetFile (actually TUrl) uses 432 as default port for rootd.
Connecting to a rootd requires the remote user id and password.
TNetFile allows three ways for you to provide your login:
1) Setting it globally via the static functions:
TNetFile::SetUser() and TNetFile::SetPasswd()
2) Getting it from the ~/.netrc file (same file as used by ftp)
3) Command line prompt
The different methods will be tried in the order given above.
On machines with AFS rootd will authenticate using AFS.
The rootd daemon lives in the directory $ROOTSYS/bin. It can be
started either via inetd or by hand from the command line (no need
to be super user). For more info about rootd see the web page:
http://root.cern.ch/root/NetFile.html.
TNetFile(const char *url, Option_t *option, const Text_t *ftitle, Int_t compress)
: TFile(url, "NET", ftitle, compress), fUrl(url)
Create a NetFile object. A net file is the same as a TFile
except that it is being accessed via a rootd server. The url
argument must be of the form: root://host.dom.ain/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 TNetFile
object. Use IsZombie() to see if the file is accessable.
If the remote daemon thinks the file is still connected, while you are
sure this is not the case you can force open the file by preceding the
option argument with an "f" or "F" , e.g.: "frecreate". Do this only
in cases when you are very sure nobody else is using the file.
~TNetFile()
TNetFile dtor. Send close message and close socket.
Bool_t Authenticate()
Authenticate to remote rootd server. Return kTRUE if authentication
succeeded.
Bool_t CheckNetrc(char *&user, char *&passwd)
Try to get user name and passwd from the ~/.netrc file.
This file will only be used when its access mask is 0600.
Returns kTRUE if user and passwd were found for the machine
specified in the URL. User and passwd must be deleted by
the caller. If kFALSE, user and passwd are 0.
void Close(Option_t *opt)
Close remote file.
void Flush()
Flush file to disk.
char* GetUser()
Get user name to be used for authentication to rootd.
User is asked to type user name.
Returns user name (which must be deleted by caller) or 0.
char* GetPasswd()
Get passwd to be used for authentication to rootd.
Uses non-echoing command line to get passwd.
Returns passwd (which must de deleted by caller) or 0.
void Init(Bool_t create)
Initialize a TNetFile object.
Bool_t IsOpen() const
Retruns kTRUE if file is open, kFALSE otherwise.
void Print(Option_t *)
Print some info about the net file.
void PrintError(const char *where, Int_t err)
Print error string depending on error code.
Bool_t ReadBuffer(char *buf, int len)
Read specified byte range from remote file via rootd daemon.
Returns kTRUE in case of error.
Bool_t WriteBuffer(const char *buf, int len)
Write specified byte range to remote file via rootd daemon.
Returns kTRUE in case of error.
Int_t Recv(Int_t &status, EMessageTypes &kind)
Return status from rootd server and message kind. Returns -1 in
case of error otherwise 8 (sizeof 2 words, status and kind).
void Seek(Seek_t offset, ERelativeTo pos)
Set position from where to start reading.
void SetUser(const char *user)
Set user name to be used for authentication to rootd.
void SetPasswd(const char *passwd)
Set passwd to be used for authentication to rootd.
Inline Functions
TNetFile TNetFile(char* url, Option_t* option, Text_t* ftitle, Int_t compress = 1)
TClass* Class()
TClass* IsA()
void ShowMembers(TMemberInspector& insp, char* parent)
void Streamer(TBuffer& b)
Author: Fons Rademakers 14/08/97
Last update: 2.22/05 04/06/99 18.59.13 by Rene Brun
Copyright (c) 1995-1999, The ROOT System, All rights reserved. *
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