SFNDX Back to Index page
 
Prolog 
Control Block Contents 
   SFNDX DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  SFNDX Prolog Top of page
  
 NAME       : HCPSFNDX
 DESCRIPTION: CHECKPOINT SPOOL FILE POINTERS
 DSECT      : SFNDX
 FUNCTION   : To point to the first map page (SPMBK) for each
              spool file in the system.  The number of entries
              in this table is determined by the size of the
              warmstart area.  Each 4K page on the warmstart
              cylinder allows for 1022 entries, one for each
              possible spoolid.  If an entry contains a zero,
              it indicates that the corresponding spoolid is
              available for a new spool file.
 LOCATED BY : The SFNDX entries occupy contiguous pages of
              system virtual storage. The first page of the
              SFNDX is pointed to by SYSVSNDX in SYSCM.
 CREATED BY : The virtual pages reserved for the SFNDX
              entries are cleared to zero when the system is
              CLEAN started. They are reinitialized when
              the system is WARM, FORCE, or COLD started
              (only entries for system data files are
              reinitialized for COLD starts).
              During normal system processing, the SFNDX
              entries are initialized by HCPSFSON when opening
              a new spool file.
 DELETED BY : When a spool file is deleted, HCPSFRDR zeroes
              out the corresponding SFNDX entry.  The storage
              allocated for the SFNDX entries is never
              deleted.
 RELOCATION CONSIDERATIONS : None
 
 
  SFNDX Control Block Content Top of page
  




 SFNDX DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      SFNDX          CHECKPOINT SPOOL FILE POINTERS
0000    0 Dbl-Word     8 SFNTSTMP       TIMESTAMP INFORMATION
0008    8 Signed       4 SFNASA (1022)  SPMBK POINTERS
1000 4096 Signed       4 SFNCCEND (0)
          SFNCCEND       SFNSCNT        1022 SFNSCNT NUMBER OF SLOTS
          SFNCCEND       SFNASATL       L'SFNASA*SFNSCNT SFNASATL Size of
                                        ASA area in bytes
          00000200       SFNSIZE        (*-SFNDX+7)/8 BLOCK SIZE IN
                                        DBLWDS
 
 
  SFNDX Storage Layout Top of page
  
          
*** SFNDX - CHECKPOINT SPOOL FILE POINTERS
*
*     +-------------------------------------------------------+
*   0 |                       SFNTSTMP                        |
*     +-------------------------------------------------------+
*   8 |                                                       |
*     =                        SFNASA                         =
*     |                                                       |
*     +-------------------------------------------------------+
*
*** SFNDX - CHECKPOINT SPOOL FILE POINTERS
 
 
  SFNDX Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
SFNASA         0008
SFNASATL       1000 SFNCCEND
SFNCCEND       1000
SFNSCNT        1000 SFNCCEND
SFNSIZE        1000 00000200
SFNTSTMP       0000
 
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:55:38 EDT.
Copyright IBM Corporation, 1990, 2013