Programming Interface Information: The Monitor Records are intended Programming Interfaces that allow the customer to write programs to obtain services of z/VM.

#### MRIODSON

Prolog
Control Block Contents
Cross Reference

#### MRIODSON Prolog

     DSECT NAME - IODSON
     FUNCTION - Map a Monitor record.
     LOCATED BY -
            Through the Monitor Control Area
     REFERENCED CONTROL BLOCKS -
            MRRECHDR    Monitor Record Header
     NAME - MRIODSON
     DESCRIPTIVE NAME - Monitor Event Record
                        Domain 6 - I/O Domain
                        Record 11- Vary On Subchannel
     DESCRIPTION - Indicates that a subchannel has been varied online

#### MRIODSON Control Block Contents

    Offsets
    Dec  Hex  Type        Len  Name (Dim)             Description

       0   0  Structure    44  IODSON                 Start of monitor record
       0   0  Character     0  IODSON_MRHDR           Record header. See MRRECHDR
                                                      for details.
       0   0  Character    20  MRHDR
       0   0  Unsigned      2  MRHDRLEN
       2   2  Unsigned      2  MRHDRZER
       4   4  Unsigned      1  MRHDRDM
       5   5  Unsigned      1  *
       6   6  Unsigned      2  MRHDRRC
       8   8  Character     8  MRHDRTOD
      16  10  Character     4  *
      20  14  Character     0  MRHDR_END
      20  14  Bitstring     1  IODSON_RDEVTYPE        Device type code. Unique
                                                      for each device within the
                                                      class in IODSON_RDEVCLAS.
      21  15  Bitstring     1  IODSON_RDEVCLAS        Device class code. Unique
                                                      for each class.
      22  16  Unsigned      2  IODSON_RDEVDVID        Device type. See
                                                      IODSON_RDEVDVIV for its
                                                      source.
      24  18  Bitstring     1  IODSON_CALMODLN        Device model identifier.
                                                      See IODSON_RDEVDVIV flag for
                                                      its source.
      25  19  Bitstring     1  IODSON_RDEVLPM         Logical path mask
      26  1A  Unsigned      2  IODSON_RDEVDEV         Device number
      28  1C  Unsigned      4  IODSON_RDEVSID         Host subchannel id
      32  20  Character     8  IODSON_RDEVCHPS        Eight channel path ids for
                                                      this device
      40  28  Unsigned      2  IODSON_RDEVCUID        control unit id. Applicable
                                                      only when IODSON_RDEVCUIV =
                                                      on.
      42  2A  Unsigned      1  IODSON_RDEVCUMN        Control unit model
                                                      identifier. Applicable only
                                                      when IODSON_RDEVCUIV = on.
      43  2B  Bitstring     1  IODSON_CALFLAGS        Flag Byte
              1... ....        IODSON_RDEVDVIV         OFF = device model number
                                                      (in IODSON_RDEVDVID) and
                                                      model identifier (in
                                                      IODSON_CALMODLN) were
                                                      provided by user through the
                                                      RDEVICE macro or device
                                                      sensing at IPL time. ON =
                                                      device type number and model
                                                      identifier were provided by
                                                      the device at device
                                                      initialization time.
              .1.. ....        IODSON_RDEVCUIV         When on, Control unit
                                                      information is supplied in
                                                      IODSON_RDEVCUID and
                                                      IODSON_RDEVCUMN.
              ..1. ....        *
              ...1 ....        *
              .... 1...        *
              .... .1..        *
              .... ..1.        *
              .... ...1        *
      44  2C  Character     0  IODSON_END

#### MRIODSON Cross Reference

                          Hex           Hex
    Name                  Offset Length Value

    IODSON                     0     44
    IODSON_CALFLAGS           2B      1
    IODSON_CALMODLN           18      1
    IODSON_END                2C      0
    IODSON_MRHDR               0      0
    IODSON_RDEVCHPS           20      8
    IODSON_RDEVCLAS           15      1
    IODSON_RDEVCUID           28      2
    IODSON_RDEVCUIV           2B           40
    IODSON_RDEVCUMN           2A      1
    IODSON_RDEVDEV            1A      2
    IODSON_RDEVDVID           16      2
    IODSON_RDEVDVIV           2B           80
    IODSON_RDEVLPM            19      1
    IODSON_RDEVSID            1C      4
    IODSON_RDEVTYPE           14      1
    MRHDR                      0     20
    MRHDR_END                 14      0
    MRHDRDM                    4      1
    MRHDRLEN                   0      2
    MRHDRRC                    6      2
    MRHDRTOD                   8      8
    MRHDRZER                   2      2

    This information is
    based on z/VM V7R2.0.

    Last updated on 09 August 2020 at 14:54:57.

    Copyright IBM Corporation, 1990, 2020