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Prolog 
Control Block Contents 
   PXIBK 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.


  PXIBK Prolog Top of page
 
 NAME       : HCPPXIBK
 DESCRIPTION: POSIX IDs Block
 DSECT      : PXIBK
 FUNCTION   : Contain the POSIX IDs associated with a
              process.
 LOCATED BY : PXINEXT
              SYSPXIBK
              VMDPXIBK
 CREATED BY : HCPPXCBS
              HCPPXCCR
              HCPPXDLN
 DELETED BY : HCPPXCRL
 SERIALIZED : The VMDPXILK serializes access to the
              PXIBK chain, and the PXILOCK serializes access to
              the data in a PXIBK.
 RELOCATION CONSIDERATIONS : This control block is relocated as part of a live
              guest relocation (LGR).  The bits and fields that
              need to be relocated are defined in the
              corresponding LGRPXIBK COPY file.  Whenever changes
              are made to this control block, consideration must
              be given to any effects these changes will have on
              a relocation.  If any new fields or bits are
              defined, they may need to be relocated.  If
              existing bits or fields are changed, corresponding
              modifications may be required in the LGR version of
              this control block.  Consider also the effects of
              these changes on a relocation involving a back-level
              release of CP.
 COMMENTS   : This block contains the POSIX user IDs
              (UIDs) and POSIX group IDs (GIDs), and it points to
              the supplementary group IDs (SGIDs).  These are
              initially set or derived from the "POSIX database".
              Since this block contains most of the environmental
              information CP has about a POSIX process, it is
              often referred to as a "process context".
              See the HCPPXC module prolog for more serialization
              and data structure details.
              Any time this block is included in a module, the
              HCPPSGBK must also be included, because the PXIBK
              references fields defined in the PSGBK.
 
 
  PXIBK Control Block Content Top of page
 

 PXIBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure PXIBK POSIX IDs Block 0000 0 Dbl-Word 8 PXILOCK (3) PXIBK lockword. It is used to serialize access to the PXIBK 0018 24 Address 4 PXINEXT Address of next PXIBK on the chain of PXIBKs owned by this virtual configuration 001C 28 Signed 4 PXIPID POSIX process ID (PID) for the process whose IDs are contained here. Only valid in non-creation PXIBKs. 0020 32 Address 4 PXIOWNER Address of the base VMDBK of the configuration that owns this POSIX process 0024 36 Bitstring 1 PXIFLAG Option flags: 1... .... PXICREAT X'80' PXICREAT Indicate this is the creation PXIBK (it is either an original or an alternate creation PXIBK) .1.. .... PXIWPSG X'40' PXIWPSG Indicates that this PXIBK contains a PSGBK at PXISGINF ..1. .... PXIRELC0 X'20' PXIRELC0 Indicates that this PXIBK can be released as soon as PSGPXICT in the imbedded PSGBK becomes 0 0025 37 Bitstring 1 * (3) Reserved for IBM use 0028 40 Bitstring 24 PXIIDS (0) ALL IDs (UIDs and GIDs) Notes : the subfields in PXIUIDS and PXIGIDS must be kept in the same order. 0028 40 Bitstring 12 PXIUIDS (0) All UIDs 0028 40 Signed 4 PXIRUID Real UID 002C 44 Signed 4 PXIEUID Effective UID 0030 48 Signed 4 PXISSUID Saved set-UID Notes : the subfields in PXIUIDS and PXIGIDS must be kept in the same order. 0034 52 Bitstring 12 PXIGIDS (0) All GIDs (except SGIDs) 0034 52 Signed 4 PXIRGID Real GID 0038 56 Signed 4 PXIEGID Effective GID 003C 60 Signed 4 PXISSGID Saved set-GID 0040 64 Address 4 PXIORGCR Pointer to the original creation PXIBK. Only meaningful in the current creation PXIBK. 0044 68 Address 4 PXIPSGBK Pointer to this process's supplementary GID information (PSGBK) 00000048 PXIHDRLN (*-PXIBK) Size of fixed-length portion of the PXIBK, in bytes 0048 72 Signed 4 PXISGINF (0) Supplementary GID info area. It only exists in the creation PXIBK. It is pointed to by PXIPSGBK of all other PXIBKs in a vConfig. It is mapped by HCPPSGBK. **** THE VALUE OF NGMAXMAX FOR DATAMAP IS 125 00000200 PXIMAXLN (PSGHDRLN+(NGMAXMAX*L'PSGSGIDS)) Maximum length of PXISGINF area, in bytes 00000248 PXIMAXBS (PXIHDRLN+PXIMAXLN) Maximum PXIBK size, in bytes 00000049 PXIMAXDS (PXIMAXBS+7)/8 Maximum PXIBK size, in doublewords
 
 
  PXIBK Storage Layout Top of page
 
          
*** PXIBK - POSIX IDs Block
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       PXILOCK                         =
*     |                                                       |
*     +---------------------------+---------------------------+
*  18 |         PXINEXT           |          PXIPID           |
*     +---------------------------+------+--------------------+
*  20 |         PXIOWNER          |:FLAG |////////////////////|
*     +---------------------------+------+--------------------+
*  28 |         PXIRUID           |         PXIEUID           |
*     +---------------------------+---------------------------+
*  30 |         PXISSUID          |         PXIRGID           |
*     +---------------------------+---------------------------+
*  38 |         PXIEGID           |         PXISSGID          |
*     +---------------------------+---------------------------+
*  40 |         PXIORGCR          |         PXIPSGBK          |
*     +---------------------------+---------------------------+
*
*** PXIBK - POSIX IDs Block
 
 
  PXIBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
PXICREAT       0024 80
PXIEGID        0038
PXIEUID        002C
PXIFLAG        0024
PXIGIDS        0034
PXIHDRLN       0044 00000048
PXIIDS         0028
PXILOCK        0000
PXIMAXBS       0048 00000248
PXIMAXDS       0048 00000049
PXIMAXLN       0048 00000200
PXINEXT        0018
PXIORGCR       0040
PXIOWNER       0020
PXIPID         001C
PXIPSGBK       0044
PXIRELC0       0024 20
PXIRGID        0034
PXIRUID        0028
PXISGINF       0048
PXISSGID       003C
PXISSUID       0030
PXIUIDS        0028
PXIWPSG        0024 40
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:54:00 EDT.
Copyright IBM Corporation, 1990, 2022