Google
 

Trailing-Edge - PDP-10 Archives - bb-d549g-sb - fildae.mem
There are 5 other files named fildae.mem in the archive. Click here to see a list.



                                FILDAE

                             File Daemon















                        Date:       April 1977
                        File:       FILDAE.RNO
                        Version:    1















The information in this document is subject to change  without  notice
and  should  not  be  construed  as  a commitment by Digital Equipment
Corporation.  Digital Equipment Corporation assumes no  responsibility
for any errors that may appear in this document.

The software described in this document is furnished under  a  lisence
and  may  be used and copied only in accordance with the terms of such
lisence.

Digital Equipment Corporation assumes no responsibility  for  the  use
and  reliability  of its software on equipment that is not supplied by
Digital.




Copyright (C) 1977 Digita1 Equipment Corp., Maynard, Mass.
SYSTEM PROGRAMMING PROCEDURES                                   Page 2
FILDAE.RNO


                               CONTENTS
SYSTEM PROGRAMMING PROCEDURES                                   Page 3
INTRODUCTION


1.0  INTRODUCTION

The File Daemon provides extended file protection.   The  File  Daemon
described in this document is a prototype that you may use to help you
in understanding the monitor  support  for  this  feature.   The  File
Daemon  is  supplied  only to serve as a prototype for the File Daemon
you may desire at your installation.

Installations will have varying types of accounting and file  security
measures  at these installations.  Therefore, each installation's File
Daemon may be written to account for  these  differences  and  varying
requirements.   The  DIGITAL-supplied  prototype  File Daemon supports
access lists and access logging that is performed on  a  user's  or  a
system administrator's request.



2.0  USER INTERFACE

The File Daemon allows any user to specify  who  can  and  who  cannot
access  his  files.   Each  user  may  create a file called ACCESS.USR
(which is described in section 1.3).  This file optionally  lists  the
names  of  some  or  all  of  that  user's  files and specifies, on an
individual file basis, the users  who  can  and  cannot  access  those
files.  Under specific conditions, the File Daemon examines the user's
ACCESS.USR file and may record information, in a separate file  called
ACCESS.LOG,  regarding  specific  access requests to the listed files.
Note that  ACCESS.USR  can  be  created  only  by  the  owner  of  the
particular directory or by a job running under [1,2].



3.0  THE FILE DAEMON

The monitor calls the File Daemon (only if the  monitor  feature  test
switch FTFDAE = -1) each time that someone tries to access a file that
has a 4, 5, 6, or 7 protection code in  the  owner's  protection  code
field  and  the  access  fails due to a protection error or due to any
protection error because of the directory protection code.

For example, if you protect a file against a specific  user  and  that
user  attempts  to access your file (e.g., LOOKUP, ENTER, RENAME), the
monitor suspends the execution of the user's program and  it  sends  a
message  to the File Daemon.  This message includes the type of access
the user is attempting and that user's project-programmer number.  The
File  Daemon  is  given  control,  and  it  looks for your file called
ACCESS.USR.  ACCESS.USR must be on the same file structure and in  the
same directory area as the file being accessed.

After examining ACCESS.USR, the File Daemon returns to the monitor the
highest  type  of access you have specified that this user can have to
your file.  Then, it logs the access request in ACCESS.LOG (if you set
the /LOG switch in your ACCESS.USR file;  refer to Table 1).

All of this occurs, even when you attempt to access your own files, if
those  files  have  a  4,  5,  6,  or 7 protection code in the owner's
protection code field.  However, as the file's  owner,  you  can  read
your  file  and  change  the file's protection code without having the
File Daemon called.  Depending on the  information  you  specified  in
your  ACCESS.USR  file, the File Daemon either grants or denies access
to the accessing user.

If the monitor attempts to pass control to the File Daemon, but it  is
SYSTEM PROGRAMMING PROCEDURES                                   Page 4
THE FILE DAEMON


not  running,  the  accessing user is denied access to the file unless
the program has full file access rights ([1,2] or  JACCT).   The  same
result occurs when one of the following conditions occurs:

     1.  The File Daemon cannot find ACCESS.USR in the  same  path  as
         the file being accessed.

     2.  The File Daemon cannot  find  ACCESS.USR  in  a  higher-level
         directory, when a scan up the directory structure is made.

If the File Daemon finds ACCESS.USR but cannot find the accessed  file
name  in  ACCESS.USR,  the File Daemon denies that user access to your
file.  The File Daemon also denies access to that  user  if  the  File
Daemon  finds  the  specified  file  name  in  ACCESS.USR;   but,  the
project-programmer  number  does  not  match  any  of   the   project-
programmer  numbers  you  have  specified that may have access to your
file.

All files listed in your ACCESS.USR are assumed to be in the same User
File  Directory (UFD) as the file called ACCESS.USR.  However, if your
ACCESS.USR is in your UFD and describes the type  of  accesses  to  be
allowed  to  files contained in the SFDs, the full path to the file in
the SFD must be specified before the File  Daemon  will  consider  the
file specification to match.

The File Daemon treats all file accessors the same.  All accesses to a
file having a 4, 5, 6, or 7 protection code in the owners's protection
code field cause the File  Daemon  to  be  called  when  a  protection
failure  (error)  results.   The  File  Daemon is always called when a
protection error occurs as a result of the directory protection  code.
Because of this equal treatment, you should not do the following:

     1.  If a [1,2] job attempts to access a file  that  is  protected
         such  that  the File Daemon is called, that job may be denied
         access to the file.  This is a possible problem, for example,
         if  the  [1,2]  job  is  FAILSA or BACKUP and you have denied
         (either implicitly or explicitly) these  programs  access  to
         your  files.   When  you  do  this,  your  file  will  not be
         FAILSAfed.  Therefore, you must accept the responsibility  of
         FAILSAfing your own files.

     2.  In general, full file access programs will not be allowed  to
         read  your files.  Therefore, under most circumstances, QUEUE
         would not be allowed to queue a file that was protected  such
         that the File Daemon was called.

     3.  If the file's owner protection code field is  such  that  the
         File  Daemon is called and the owner has neglected to include
         his own project-programmer  number  in  ACCESS.USR  for  this
         file,  the  File  Daemon  grants  the  owner the same type of
         access as if a 7 were in the owner's  protection  code  field
         (i.e.,  the owner can only read the file or change the file's
         protection code.)

     4.  ACCESS.USR  files  may  be  restored  at   arbitrary   times.
         Therefore,  a full restore of the disk using BACKUP or FAILSA
         should not be done when the File Daemon is running.  If  such
         a   full   restore   is   done,  the  action  may  not  allow
         BACKUP/FAILSA to restore files that ACCESS.USR allows them to
         BACKUP.
SYSTEM PROGRAMMING PROCEDURES                                   Page 5
THE FILE DAEMON


     5.  The CHKACC monitor call tells a program what  a  user's  file
         access privileges are.  Therefore, by using CHKACC, a program
         can tell if the File Daemon will be called,  but  the  access
         privileges returned by the File Daemon are not known.




4.0  ACCESS.USR

Every user can create his own ACCESS.USR file.  Note  that  ACCESS.USR
files  can be created only by the owner of the specific directory or a
[1,2] job.  ACCESS.USR is made up of  one  or  more  'command  lines'.
Each 'command line' must be written in the following format:

        file-spec/switches=[PPN]/switches,...,[ppn]/switches

The   file-spec   is   a   full   file  specification  (i.e.,  device:
filename.extension [path]).   The  File  Daemon  scans  each  line  in
ACCESS.USR  until  it  matches a file specification on the left of the
equals sign and a PPN on the right.  All access rights  will  then  be
determined  by  that line (there will be no continued scan).  The user
should  minimally  specify  one  of  the  switches   synonymous   with
protection   codes  (i.e.,  READ,  EXECUTE,  ALL,...)  for  that  file
specification;  refer to Table  1.   If  no  switch  is  specified,  a
default  of  /NONE  is  provided.  The possible switches are listed in
Table 1.


                               TABLE 1

                         ACCESS.USR Switches


!---------------!----------------------------------------------!
!               !                                              !
!  SWITCH       !                 MEANING                      !
!               !                                              !
!---------------!----------------------------------------------!
!               !                                              !
!    /LOG       !  This switch causes the  File  Daemon to log !
!    /NOLOG     !  any access attempt in the file  ACCESS.LOG. !
!               !  If this  switch is specified,  a LOG  entry !
!               !  is appended to the end of ACCESS.LOG, which !
!               !  is  found  in the  same  directory  as your !
!               !  ACCESS.USR.   The log  entry  includes  the !
!               !  following:                                  !
!               !                                              !
!               !  the date of the access                      !
!               !  the time of the access                      !
!               !  the job number of the accessing job         !
!               !  the PPN and name associated with the        !
!               !     accessing job                            !
!               !  the name of the accessing program           !
!               !  the type of access attempted                !
!               !  the full file specification of the          !
!               !    access file                               !
!               !  the access permitted, detailing             !
!               !    whether access was permitted              !
!               !    to the file                               !
!               !                                              !
!---------------!----------------------------------------------!
SYSTEM PROGRAMMING PROCEDURES                                   Page 6
ACCESS.USR


                         Table 1 (Continued)

                         ACCESS.USR Switches


!---------------!----------------------------------------------!
!               !                                              !
!    SWITCH     !                     MEANING                  !
!               !                                              !
!---------------!----------------------------------------------!
!               !                                              !
!               !  If the /EXIT or /CLOSE switch is also spec- !
!               !  ified,  the following  information  is also !
!               !  included in the LOG entry (both the initial !
!               !  entry and when the file is closed)          !
!               !                                              !
!               !  the accessing job's run time                !
!               !  kilo-core-seconds                           !
!               !  disk reads                                  !
!               !  disk writes                                 !
!               !                                              !
!               !  If the  File Daemon cannot find  ACCESS.LOG !
!               !  in your area, it creates one, giving it the !
!               !  same  protection code  as your  ACCESS.USR. !
!               !  Note that the File Daemon can always access !
!               !  ACCESS.USR and ACCESS.LOG.                  !
!               !                                              !
!  /LOG:n       !  The /LOG switch allows logging based on the !
!               !  switch value.   The following are the legal !
!               !  switch values:                              !
!               !                                              !
!               !      ALL - Log all access attempted (same    !
!               !            as /LOG.)                         !
!               !                                              !
!               !      NONE - Do not log accesses  (same as    !
!               !            /NOLOG.)                          !
!               !                                              !
!               !      SUCCESSES - Log only those  accesses    !
!               !            that were permitted to succeed.   !
!               !                                              !
!               !      FAILURES - Log  only those  accesses    !
!               !            that were not permitted.
!               !                                              !
!  /CLOSE       !  If the  /LOG switch  and the  /CLOSE switch !
!  /NOCLOSE     !  are specified,  the File Daemon  makes  the !
!               !  log entry when the file is closed.          !
!               !                                              !
!  /EXIT        !  If a program is executing  and the /LOG and !
!  /NOEXIT      !  /EXIT  switches  have been  specified,  the !
!               !  File  Daemon makes  the log  entry when the !
!               !  program has finished execution.             !
!               !                                              !
!  /CREATE      !  The /CREATE  switch allows a user who would !
!  /NOCREATE    !  ordinarily  not be allowed  to create files !
!               !  in your directory to do so.  This switch is !
!               !  used in conjunction with one of the ACCESS. !
!               !  USR  switches that are  synonmous with pro- !
!               !  tection codes (e.g., /RENAME).  This switch !
!               !  can appear on either side of the equal sign !
!               !  An  example  of a  command  line  with  the !
!               !  /CREATE switch is as follows                !
!               !                                              !
!---------------!----------------------------------------------!
SYSTEM PROGRAMMING PROCEDURES                                   Page 7
ACCESS.USR


                         Table 1 (Continued)

                         ACCESS.USR Switches


!---------------!----------------------------------------------!
!               !                                              !
!    SWITCH     !                     MEANING                  !
!               !                                              !
!---------------!----------------------------------------------!
!               !                                              !
!               !   WONDER.TST=[10,3333]/CREATE/NONE=[*,*]     !
!               !                                              !
!               !  which allows any user to create  WONDER.TST !
!               !  in your directory,  but none of those users !
!               !  may have any other access to that file.     !
!               !                                              !
!               !  Another example is                          !
!               !                                              !
!               !  WOND.TST=[10,10]/CREATE/READ[*,*]/NONE      !
!               !                                              !
!               !  which prevents all users from accessing the !
!               !  file WOND.TST,  but allows user [10, 10] to !
!               !  create the file WOND.TST.                   !
!               !                                              !
!  /PROT:nnn    !  This switch  specifies the  protection code !
!               !  with  which a file  will be  created.  This !
!               !  switch is allowed  only on the left side of !
!               !  The equal sign.   The value nnn  must be an !
!               !  octal number in the range  0-777.  The file !
!               !  is created  with the  specified  protection !
!               !  code if the following conditions occur:     !
!               !                                              !
!               !  l.  The /PROTECTION switch is specified.    !
!               !                                              !
!               !  2.  The File Daemon is called because a     !
!               !      user attempts  to create a file  in     !
!               !      directory  protected  against  that     !
!               !      user.                                   !
!               !                                              !
!               !  3.  The File Daemon  allows the user to     !
!               !      create the file  (determined by the     !
!               !      contents of ACCESS.USR).                !
!               !                                              !
!  /PROG:file   !  This switch allows the specified program to !
!               !  have the desired type of access to the file !
!               !  This switch  can appear  only on the  right !
!               !  side of the equal sign in the command line. !
!               !  For example:                                !
!               !                                              !
!               !  ONE.TST/READ=[10,10],[10,65]/WRITE,[1,2]    !
!               !                                              !
!               !          /PROGRAM:SYS:BACKUP                 !
!               !                                              !
!               !  where  [10,10]  jobs can read  ONE.TST, and !
!               !  [10,65]  jobs  can read and write  ONE.TST, !
!               !  a job logged in under [1,2] running  BACKUP !
!               !  can read  the file.  No one else can access !
!               !  ONE.TST.                                    !
!               !                                              !
!               !  You may  omit the device  specification  or !
!               !                                              !
!---------------!----------------------------------------------!
SYSTEM PROGRAMMING PROCEDURES                                   Page 8
ACCESS.USR


                         Table 1 (Continued)

                         ACCESS.USR Switches


!---------------!----------------------------------------------!
!               !                                              !
!    SWITCH     !                     MEANING                  !
!               !                                              !
!---------------!----------------------------------------------!
!               !                                              !
!               !  you may specify DSK:  or ALL:  in the file- !
!               !  spec argument to the /PROGRAM switch.  How- !
!               !  ever,  this is not a  recommended procedure !
!               !  because  there  may be  potential  security !
!               !  violations.  The  File Daemon  has no know- !
!               !  ledge of your search list;  therefore, DSK: !
!               !  is  treated  identically  to  ALL:.   It is !
!               !  recommended that the device  name be either !
!               !  a file structure  name or an ersatz  device !
!               !  (LIB: is not allowed, however).             !
!               !                                              !
!  /XONLY       !  The /XONLY switch,  when it appears in con- !
!               !  junction with the PROGRAM switch, considers !
!               !  the specified  program to match the program !
!               !  doing the accessing, only if this accessing !
!               !  program is Execute-only.                    !
!               !                                              !
!  /ALL         !  ALL access  is allowed when this  switch is !
!               !  specified.   Specified  accessors  of  this !
!               !  file can change the protection of the file, !
!               !  rename, write, execute, update,  and append !
!               !  to the file.  (This is equal to  protection !
!               !  code 0.)                                    !
!               !                                              !
!  /RENAME      !  RENAME  access is  allowed.   Specified ac- !
!               !  cessors of this file  can rename,  execute, !
!               !  write,  read,  update,  and  append  to the !
!               !  file. (This is equal to protection code 1.) !
!               !                                              !
!  /WRITE       !  Write access is allowed.  Desired accessors !
!               !  of this file can write,  read, execute, up- !
!               !  date,  and  append  to the  file.  (This is !
!               !  the same as protection code 2.)
!               !                                              !
!  /UPDATE      !  Update  access  is   permitted.   Specified !
!               !  accessors  of the file can update,  append, !
!               !  read, and execute the file.  (This is equal !
!               !  to protection code 3.)                      !
!               !                                              !
!  /APPEND      !  Append access is allowed.  Specified acces- !
!               !  sors  of this  file  can append,  read,  or !
!               !  execute  the  file.  (This is  the  same as !
!               !  protection code 4.)                         !
!               !                                              !
!  /READ        !  Read  access is  allowed.  Specified acces- !
!               !  sors of  this file can read or execute  the !
!               !  file.  (This is the same as protection code !
!               !  5.)                                         !
!               !                                              !
!---------------!----------------------------------------------!
SYSTEM PROGRAMMING PROCEDURES                                   Page 9
ACCESS.USR


                         Table 1 (Continued)

                         ACCESS.USR Switches


!---------------!----------------------------------------------!
!               !                                              !
!    SWITCH     !                     MEANING                  !
!               !                                              !
!---------------!----------------------------------------------!
!               !                                              !
!  /EXECUTE     !  Execute  access  is  permitted.   Specified !
!               !  accessors of this file can only execute the !
!               !  file.  (This is the same as protection code !
!               !  6.)
!               !                                              !
!  /NONE        !  No access is allowed to the file.  (This is !
!               !  the same as protection code 7.)             !
!               !                                              !
!---------------!----------------------------------------------!

You  create  an  ACCESS.USR   to   specify   for   each   file   which
project-programmer numbers can access it and what type of access those
accessors can have.  The switches indicate the type of access allowed.

Switches appearing on the left side of  the  equals  sign  affect  all
project-programmer  numbers  appearing on the right side of the equals
sign.  However, with the exception  of  the  /PROTECTION  switch,  the
switch   on   the  left  side  can  be  overridden  for  one  or  more
project-programmer numbers specified on the right side  of  the  equal
sign.   You can override the switches by explicitly specifying another
switch.   For  example,  if  the  following  line  appeared  in   your
ACCESS.USR file:

        TST.TST/ALL=[10,*],[11,*],[27,*],[17,*]/NONE

The  File  Daemon will allow all members of projects 10, 11, and 27 to
have complete access to the file TST.TST.  However, members of project
17  will  be denied accces to TST.TST.  For project-programmer numbers
other than 10, 11, 27, 17, the File Daemon will  search  for  a  later
TST.TST  that  contains the accessing job's project-programmer number.
If no match is found, the accessing user's request is denied.

Full wild card specifications are allowed both on the left  and  right
sides  of the equal sign.  Comments and continuation lines are allowed
in ACCESS.USR.  A comment on a line or a comment line must begin  with
a  semicolon  or  an  explanantion  point.   A  continuation  line  is
indicated by inserting a hyphen (minus  sign)  immediately  proceeding
the  carriage  return that terminates the current line.  If there is a
syntax error in a line in  ACCESS.USR,  that  line  is  ignored.   You
should  ensure  the  accuracy of your own ACCESS.USR files by proofing
carefully.  If the following line were in your ACCESS.USR file:

        FOO.BAR+[*,*]

The  line  will  be  ignored  because a + sign appears where an = sign
should appear.  All users will be denied access to FOO.BAR, since  the
File  Daemon  denies  access to all files not appearing in ACCESS.USR.
Since the File Daemon ignores the line, it does not know that  FOO.BAR
is listed in the file.
SYSTEM PROGRAMMING PROCEDURES                                  Page 10
ACCESS.USR


4.1  Example Of An ACCESS.USR File

The following is an example of an ACCESS.USR file that  uses  most  of
the features of the File Daemon.

     Directory user = [13,675]

     Directory protection = <700>

     File           Protection

     ACCESS.USR     <777>
     ACCESS.LOG     <777>
     F1.TST         <077>        - File Daemon will not be called.
     F2.TST         <457>        - Project may READ, otherwise call
                                   File Daemon.
     F3.TST         <477>        - Only owner may access without File
                                   Daemon.
     F4.TST         <777>        - Call File Daemon on all accesses.


     ACCESS.USR

     ACCESS.*/NONE=[*,*]         ;No one can touch the ACCESS.USR  and
                                 ACCESS.LOG  including [1,2] and JACCT
                                 users.  Note that these files  cannot
                                 be  backed  up  if the File Daemon is
                                 running.

     ALL:*.*/READ/LOG=[1,2]/PROGRAM:SYS:BACKUP/XONLY

                                 ;Allow  BACKUP  (from  SYS,   execute
                                 only,  and  running  under  [1,2]) to
                                 read file and make LOG entry.

     F?.TST/LOG=[10,11]/NONE,[10,*]/EXECUTE/EXIT/CLOSE

                                 ;Log  Project  10  attempts  to   use
                                 F1,F2,F3, catch [10,11] and permit no
                                 access.   Other  project  users   may
                                 EXECUTE   only  with  additional  log
                                 entries to record statistics.

     *.*/CREATE/PROTECTION:055=[12,21]/ALL,[12,17]

                                 ;[12,21] has privileges for all files
                                 (except   ACCESS.*)  and  may  create
                                 files which have a protection of 055.
                                 [12,17]  has  no  access  to any file
                                 (/NONE is a default) but  may  create
                                 files.  No log entries will be made.

     *.*/CREATE/PROTECTION:777/LOG=[123,456]/NONE

                                 ;[123,456] may create files  at  will
                                 but  may  not  access  them  (e.g., a
                                 student turning in homework).

     *.*[13,675,A]/ALL/PROTECTION:057/CREATE=[1,2]/LOG

                                 ;[1,2] has all privileges in this SFD
                                 and   may   create   files   with   a
                                 protection of 057.
SYSTEM PROGRAMMING PROCEDURES                                  Page 11
ACCESS.USR



     [13,675].UFD/LOG/READ=[*,*] ;Anyone may read this directory as  a
                                 file.

     F3.TST/LOG=[12,3]/EXECUTE
     *.*/LOG=[12,3]/NONE         ;[12,3]  may   execute   F3.TST   and
                                 nothing else.

     *.*=[*,*]/NONE              ;No other access is  granted  and  no
                                 LOG entry is made.

Note  that  entries  are scanned from left to right and top to bottom.
The scan stops on the first match of a file name of the left  side  of
the  equal  sign  and a project-programmer number on the right side of
the equal sign.  When you create your ACCESS.USR file, you should take
care  to  see  that a wild card specification will not match in a line
earlier than a specific specification in a later line.  As  a  general
rule, place specific statements first in the ACCESS.USR file, followed
by more general "catch alls".  If you want to log  entries,  you  must
use  the /LOG switch (and any of the other switches) on every line for
which that switch applies.



5.0  MONITOR INTERFACE TO A FILE DAEMON

A File Daemon is a  privileged  program  that  can  be  used  for  the
following purposes:

     1.  overseeing file accesses

     2.  aiding in proprietary billing

     3.  tracking program usage

The interface between the monitor and a File Daemon that is  described
in this section is supplied and supported by Digital.

There is  a  privileged  program  called  the  File  Daemon.   Digital
supplies  one unsupported version of a File Daemon, which is described
in the above sections of this document.  But, each installation should
write  their  own  File Daemon, because each installation will vary on
its requirements for such a program.

When a File Daemon is running, the monitor calls it every time someone
tries to access a file or a directory that has a 4, 5, 6, or 7 code in
the owner's protection code field and the  access  fails  due  to  the
protection  error.   In  order  that the monitor knows there is a File
Daemon, the following must occur:

     1.  The feature test switch F%FDAE must be set to -1,  to  enable
         the condition.

     2.  The program that will be the File Daemon must  be  privileged
         (i.e.,  it  must  be  running under [1,2] or running with the
         JACCT bit set.)

     3.  This program must send an IPCF request to [SYSTEM] IPCC (code
         6,  .IPCSC)  requesting a special PID (refer to Chapter 11 of
         the Monitor Calls Manual).
SYSTEM PROGRAMMING PROCEDURES                                  Page 12
MONITOR INTERFACE TO A FILE DAEMON


     4.  This  program  must  then  send  a  request  to  [SYSTEM]IPCC
         specifying  code  24  (.IPCWP).   This code requests that the
         File Daemon's PID be entered in the Special PID table.

After  each  request  to  [SYSTEM]IPCC,  the  File   Daemon   receives
verification  that  the  function  occurred.   After  the verification
resulting from the File Daemon specifying code 24, the  monitor  sends
an  IPCF packet to the File Daemon each time that a protection failure
occurs on a file or a directory.

The message portion of the IPCF packet that the monitor sends  to  the
File Daemon when a protection failure occurs has the following format:

                !-----------------!-----------------!
                ! type of access  !       code      !
                !-----------------!-----------------!
                !          file structure name      !
                !-----------------------------------!
                !              file name            !
                !-----------------------------------!
                !          file name extension      !
                !-----------------!-----------------!
                ! project number  ! programmer num. !
                !-----------------!-----------------!
                !  sub-file directory 1 or 0        !
                !-----------------------------------!
                !  sub-file directory 2 or 0        !
                !-----------------------------------!
                !  sub-file directory 3 or 0        !
                !-----------------------------------!
                !  sub-file directory 4 or 0        !
                !-----------------------------------!
                !  sub-file directory 5 or 0        !
                !-----------------------------------!

Where:  type of access is the type of access being  attempted  to  the
        file.  The Access Type Codes are Listed in Table 2.

        code is a File Daemon code, all of which are listed  in  Table
        3.

The remaining words in the IPCF  packet  message  are  the  full  file
specification for the file being accessed.


                               Table 2

                             Access Codes


        !------!------------!-------------------------!
        ! code !  mnemonic  !         meaning         !
        !------!------------!-------------------------!
        !      !            !                         !
        !  0   !   FNCNAA   !  No access is allowed.  !
        !  1   !   FNCEXE   !  Execute.               !
        !  2   !   FNCRED   !  Read.                  !
        !  3   !   FNCALL   !  Allocate.              !
        !  4   !   FNCDLL   !  Deallocate.            !
        !  5   !   FNCAPP   !  Append.                !
        !  6   !   FNCUPD   !  Update.                !
        !      !            !                         !
        !------!------------!-------------------------!
SYSTEM PROGRAMMING PROCEDURES                                  Page 13
MONITOR INTERFACE TO A FILE DAEMON


                         Table 2 (Continued)

                             Access Codes
        !------!------------!-------------------------!
        ! code !  mnemonic  !         meaning         !
        !------!------------!-------------------------!
        !  7   !   FNCCRE   !  Create.                !
        !  10  !   FNCSUP   !  Supersede.             !
        !  11  !   FNCTRN   !  Truncate.              !
        !  12  !   FNCCAT   !  Change attributes.     !
        !  13  !   FNCDEL   !  Delete.                !
        !  14  !   FNCCNM   !  Change name.           !
        !  15  !   FNCCPR   !  Change protection.     !
        !      !            !                         !
        !------!------------!-------------------------!


                               Table 3

                          File Daemon Codes

!------!------------!------------------------------------------!
!      !            !                                          !
! code !  mnemonic  !                  meaning                 !
!      !            !                                          !
!------!------------!------------------------------------------!
!      !            !                                          !
!  1   !  .FLDCA    !  The  accessing program has performed  a !
!      !            !  LOOKUP, ENTER,  or RENAME and a protec- !
!      !            !  tion failure occured.                   !
!      !            !                                          !
!  2   !  .FLDIC    !  As a result of a  previous call  to the !
!      !            !  File  Daemon,  it requested  that it be !
!      !            !  called when the program issues a CLOSE. !
!      !            !  This code is set as  the result of  the !
!      !            !  program  issuing an  input CLOSE. Refer !
!      !            !  to Table 5, flag bit 1.                 !
!      !            !                                          !
!  3   !  .FLDOC    !  As a result of a  previous call  to the !
!      !            !  File  Daemon,  it requested  that it be !
!      !            !  called when the program issues a CLOSE. !
!      !            !  This code  is set as the  result of the !
!      !            !  program issuing an output CLOSE.  Refer !
!      !            !  to Table 5, flag bit 1.                 !
!      !            !                                          !
!  4   !  .FLDXT    !  This  code  is  set as a  result  of  a !
!      !            !  previous call to the File Daemon, which !
!      !            !  occurred  because a job  tried to issue !
!      !            !  a  R,  RUN,  or GET  command  or a  RUN !
!      !            !  monitor call and a protection error re- !
!      !            !  sulted.  The File Daemon requested that !
!      !            !  the monitor call it when the  accessing !
!      !            !  program has  terminated execution.  The !
!      !            !  termination of a program's execution is !
!      !            !  defined  by the terminal user or by the !
!      !            !  batch  .CTL file,  either of  which may !
!      !            !  type  something that  logically  super- !
!      !            !  sedes the core image.  The  program may !
!      !            !  also  terminate its  own  execution  by !
!      !            !  performing a RUN monitor call. Refer to !
!      !            !  Table 5, flag bit 2.                    !
!      !            !                                          !
!------!------------!------------------------------------------!
SYSTEM PROGRAMMING PROCEDURES                                  Page 14
MONITOR INTERFACE TO A FILE DAEMON


                         Table 3 (Continued)

                          File Daemon Codes

!------!------------!------------------------------------------!
!      !            !                                          !
! code !  mnemonic  !               meaning                    !
!      !            !                                          !
!------!------------!------------------------------------------!
!      !            !                                          !
!  5   !  .FLDPG    !  The File Daemon is called because a job !
!      !            !  tried to execute a protected program by !
!      !            !  issuing a R,  RUN,  or GET command or a !
!      !            !  a RUN monitor call.                     !
!      !            !                                          !
!  6   !  .FLDDA    !  The  File  Daemon  is called  because a !
!      !            !  directory protection failure occurred.  !
!      !            !                                          !
!------!------------!------------------------------------------!

The File Daemon responds to the monitor by sending the monitor an IPCF
packet.  The packet's message is in the following format:

        !-----------------!---------!---------!
        !                 !         !   job   !
        !   reserved      ! reserved! number  !
        !                 !         !         !
        !-----------------!---------!---------!
        !     !   !       !                   !
        !flags! 0 !create !      access       !
        !     !   !       !                   !
        !-----!---!-------!-------------------!
        0    3 4 8 9    17 18     27 28     35

Where:  job number is the number of the job  attempting  to  access  a
        file.

        flags are bits 0 through 3 which are described in Table 4.

        create is the protection  code  at  which  the  file  will  be
        created if job number is creating a file.

        access is the highest access this job is allowed to this file.
        Refer to Table 3.

The monitor grants or denies the job's access to the file based on the
access  value  and  the type of access specified by the accessing job.
If the access value in the packet from the File Daemon to the  monitor
is  greater  than  or  equal  to  the type of access the accessing job
desired, the monitor grants the job access to the file.
SYSTEM PROGRAMMING PROCEDURES                                  Page 15
MONITOR INTERFACE TO A FILE DAEMON


                               Table 4
                          File Daemon Flags


!------!------------!------------------------------------------!
!      !            !                                          !
! code !  mnemonic  !                  meaning                 !
!      !            !                                          !
!------!------------!------------------------------------------!
!      !            !                                          !
!  0   !   FL.DAA   !  The monitor is to call the  File Daemon !
!      !            !  every time this file is  accessed.  For !
!      !            !  example, if this bit is not set and the !
!      !            !  program did a RENAME  before  a LOOKUP, !
!      !            !  the  File Daemon  would get called only !
!      !            !  on the LOOKUP.                          !
!      !            !                                          !
!  1   !  FL.DCL    !  The File Daemon is called when the file !
!      !            !  is CLOSED.                              !
!      !            !                                          !
!  3   !  FL.DXT    !  The  File Daemon  is called  when  this !
!      !            !  program's execution is terminated.      !
!      !            !                                          !
!  3   !  FL.DSP    !  If the program is attempting to  create !
!      !            !  a file and this bit is set, the monitor !
!      !            !  assumes  that the  protection  code for !
!      !            !  the  file is  in bits  9 through  17 of !
!      !            !  this word.                              !
!      !            !                                          !
!------!------------!------------------------------------------!