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Text 22255, 232 rader
Skriven 2015-03-30 00:35:42 av FidoNews Robot (2:2/2.0)
Ärende: FidoNews 32:13 [03/08]: Ftsc Information
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  3.4. Differences in flow and reduced flow files.

        "Real" flow file means that the system has a portion of
        information to be sent while a reduced flow file only
        expresses a desire to make a poll.

        Thus if a mailer detects a flow file in the directory, it
        must determine whether this is a real flow file or just a
        control file.

        If it is a real flow file the mailer must make a poll accor-
        ding to the flavour, send information to the remote according
        to the type of flow file and delete the flow file after
        sending all information. The mailer should not wait for the
        end of the session when deleting the flow file.

        Thus if a session is terminated accidentally or deliberately
        after sending the flow file information the mailer will return
        to its previous state without a priority flow file in the
        outbound.

        If it is a reduced flow file the mailer must make a poll
        according its flavour. The mailer has nothing to send from the
        control file and it must delete the flow file after the
        successful end of session.

        Thus if a session is terminated accidentally or deliberately
        while sending information, the mailer will return to its
        previous state with the priority flow file in the outbound.

        That is why it is not a good idea to lock flow files during
        the session.

4. File Requests
----------------

  4.1   File request files are named using the same method as flow
        files, with an extension of req. The format of request files
        is documented in FTS-0006. File requests have no flavour on
        their own. They DO NOT initiate a poll to the remote system,
        and must be accompanied by a [reduced] flow file. File
        requests may have additional restrictions (for example,
        based on Nodelist flags or ZMH restrictions) specific to the
        request. Normally this file is deleted after receiving the
        requested files.

        As with NetMail flow files, during a session this file must
        be dynamically renamed at the moment of sending to a remote
        system with a unique name and extension of req.


5. Control files
----------------
  5.1.  bsy (busy) control file

        A bsy is a main control file that must be used by any software
        dealing with flow files in BSO. It is named the same way as
        the flow file but with the extension ".bsy".

        Any software must check this file before doing any changes
        in flow files. If a bsy file exists all changes are prohibited
        in any corresponding flow files. What the software must do in
        this case is implementation dependent.

        If a bsy file does not exist software must create it, ensure
        that it was successfully created, and then work with the flow
        files. After completing the job, software must delete the bsy
        file.

        Note to software developers:
        The most common way to create a file in many languages (eg.
        ReWrite, fopen) also quietly overwrites an existing file, so
        there's a race condition between checking, creating and
        checking. Care must be taken to use the right function and/or
        the right options to get the correct behaviour.

        During the session and before sending information from flow
        files the mailer creates the list of all AKAs presented by the
        remote system. The mailer must then check bsy files
        corresponding to the list. If a bsy file is detected the
        corresponding AKA is removed from the list. If all AKAs are
        removed due to this procedure, the session must be terminated
        with an appropriate diagnostic message.

        If a bsy file for the AKA is not present the mailer must
        create it. A bsy file is created by the mailer only after
        a successful connection with the remote mailer.

        After session - successful or not - the mailer must delete all
        created bsy files.

        After restoring the system due to a crash it is recommended to
        run a simple routine to delete all bsy files in all outbounds
        before starting any software dealing with BSO.

        It is also recommended to check the age of bsy files. It is
        reasonable to ignore and delete bsy files with an age more
        than the maximum estimated time of session multiplied on 2.
        An appropriate diagnostic message may be produced in this
        case.

        For information purposes a bsy file may contain one line of
        PID information (less than 70 characters).

  5.2.  csy (call) control file

        This control file is created by a mailer when it decides
        to make poll to remote system. It is named the same way as a
        flow file but with the extension ".csy". A csy file is valid
        only for another mailer working together on the same system.
        Note that the remark regarding race conditions when creating a
        bsy file, also applies when creating a csy file.

        csy files are created for all remote AKAs as shown in the
        mailer config.

        The presence of a csy file corresponding to any remote AKA
        indicates that the mailer must stop trying to poll the remote
        system regardless of the presence of flow files.

        After a session - successful or not - and after an unsuccess-
        ful try the mailer must delete all created csy files.

        After restoring a system due to a crash it is recommended to
        run a simple routine to delete all csy files in all outbounds
        before starting any software dealing with BSO.

        It is also recommended to check the age of csy files. It is
        reasonable to ignore and delete csy files with an age more
        than the maximum estimated time of a session multiplied by 2.
        An appropriate diagnostic message may be produced in this
        case.

        For information purposes, a csy file may contain one line of
        PID information (less than 70 characters).

  5.3.  hld (hold) control file

        This control file is created by a mailer or other software
        when it decides to stop trying poll a remote system.
        hld file is meaningful only for mailers. It is named the same
        way as a flow file but with the extension ".hld".

        An existing hld file is either replaced by a new one or
        edited.

        A hld file must contain a one line string with the expiration
        of the hold period expressed in UNIX-time.

        The presence an hld file corresponding to any remote AKA
        indicates that the mailer must check the content before trying
        to poll the remote system. If the expiration time is in the
        future, the mailer must stop trying to poll the remote system
        regardless of the presence of any flow files.

        The presence and content of an hld file must be checked before
        each attempt to create a poll.

        If software finds an hld file with an expiration time in past,
        it must delete that hld file.

        For information purposes the second line of an hld file may
        contain one line of PID information. (Less than 70 characters)

  5.3.  try control file
        This control file is created by a mailer when a connect
        attempt is finished - successful or not. It is named the same
        way as a flow file but with the extension ".try".

        An existing try file is replaced by a new one.

        A try file must contain one line string with a diagnostic
        message. It is for information purposes only.

        For information purposes the second line of a try file may
        contain one line of PID information. ( < 70 characters)


A. References
-------------

  [FTS-0001] A Basic FidoNet(r) Technical Standard
             Randy Bush, 30 Sep 95.

  [FTS-0006] YOOHOO and YOOHOO/2U2
             Vince Perriello, 30 Nov 1991.

             T-Mail. Reference Manual
             Andy Elkin, 1997.

             BinkleyTerm. Reference Manual
             1987-1996 Bit Bucket Software, Co.


B. Contact Data
---------------

   Igor Romanovsky
   Fidonet:  2:5022/60
   E-mail:   Igor.Romanovsky@tula.net
   Administrator
   Fidonet: 2:2/20
   E-mail: administrator@ftsc.org


C. History
----------

   This document is based on FSP-1034 by Igor Romanovsky. Some minor
   technical modifications were made by Markus Reschke, Fred Riccio
   and other FTSC members. Grammar and typographical corrections were
   made by Dallas Hinton and others.


   Rev.1, 2014-11-09: Initial Release.
   Rev.2, 2015-03-29: Added section on file requests, fixed typos.
                      Minor reformatting.

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