efn

    OpenVMS usage:ef_number
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value
    Number of the event flag that is set when the service completes.
    If this argument is omitted, event flag 0 is used.

 flags

    OpenVMS usage:mask_longword
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value
    Flags specifying options for the service. The flags argument is
    a longword bit mask in which each bit corresponds to an option
    flag. The $DDTMDEF macro defines symbolic names for these option
    flags described in $GETDTI Option Flags. All undefined bits must
    be 0. If this argument is omitted, no flags are used.

    Table SYS-19 $GETDTI Option Flags

    Flag Name        Description

    DDTM$M_FULL_     Indicates that the $GETDTI call for a specified
    STATE            TID is not to complete until the ABORTED
                     or COMMITTED state can be returned. Thus,
                     if another node or coordinating resource
                     manager must be contacted and it is currently
                     unreachable, this service does not return
                     until the node can be contacted. Indicates on
                     a wildcard search that only transactions known
                     to be in the ABORTED or COMMITTED states are to
                     be returned.
    DDTM$M_SYNC      Specifies successful synchronous completion by
                     returning SS$_SYNCH. When SS$_SYNCH is returned,
                     the AST routine is not called, the event flag is
                     not set, and the I/O status block is not filled
                     in.

 iosb

    OpenVMS usage:io_status_block
    type:         quadword (unsigned)
    access:       write only
    mechanism:    by reference
    The I/O status block in which the completion status of the
    service is returned as a condition value.

    Refer to the VSI OpenVMS System Services Reference Manual to view
    the I/O status block diagram.

 astadr

    OpenVMS usage:ast_procedure
    type:         procedure entry mask
    access:       call without stack unwinding
    mechanism:    by reference
    The AST routine executed when the service completes, if SS$_
    NORMAL is returned in R0. The astadr argument is the address of
    the entry mask of this routine. The routine is executed in the
    same access mode as that of the caller of the $GETDTI service.

 astprm

    OpenVMS usage:user_arg
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value
    The AST parameter passed to the AST routine specified by the
    astadr argument.

 log_id

    OpenVMS usage:uid
    type:         octaword (unsigned)
    access:       read only
    mechanism:    by reference
    The log id of the transaction manager that is coordinating the
    transaction, returned as the log_id argument on a $DECLARE_RM
    operation. The log_id argument verifies that the recovery log
    returning transaction information is the same one used to record
    transaction state information.

    If you do not specify the same log id used by the transaction
    manager to write transaction information, then $GETDTI will
    return an error.

    If the log_id argument is specified as a zero UID, then $GETDTI
    will use the current active log for this node. If the specified
    transaction cannot be found in this log, then the returned state
    will be aborted. The log identifier can only be specified as
    zero when the DTI$_SEARCH_AS_NODE item is absent or results in
    a search that specifies the local node. Note that the log_id
    argument cannot be specified as a zero address.

    To ensure smooth operation in a mixed-network environment,
    refer to the chapter entitled Managing DECdtm Services in the
    VSI OpenVMS System Manager's Manual, for information on defining
    node names.

 contxt

    OpenVMS usage:contxt
    type:         longword (unsigned)
    access:       modify
    mechanism:    by reference
    The address of a longword used to maintain a context between
    sequential calls to $GETDTI. A call to $GETDTI will start a new
    search if the context value is zero or continue the existing
    search if the context is valid.

    The search context is valid only after a successful call to
    $GETDTI and is invalidated by a subsequent call to $GETDTI.

    The context is also used as input to $SETDTI after a successful
    call to $GETDTI. Calls to $SETDTI do not modify or invalidate the
    context.

 search

    OpenVMS usage:item_list_3
    type:         descriptor list
    access:       read only
    mechanism:    by reference
    Item list specifying how the search for transaction information
    is to be bounded.

    The search argument is the address of a list of item descriptors,
    each of which describes a search item. The list of item
    descriptors is terminated by a longword of 0. Each item
    descriptor in the search item list acts as an input argument
    to $GETDTI and as such is only required to be read only.

    Refer to the VSI OpenVMS System Services Reference Manual to view
    the single item descriptor format.

    The following table describes the search item descriptor fields:

    Field          Description

    Buffer         A word containing a user-supplied integer
    length         specifying the length (in bytes) of a buffer from
                   which $GETDTI is to read the information. The
                   length of the buffer needed depends on the item
                   code field of the search item descriptor. If the
                   value of buffer length is too small, $GETDTI will
                   return an error status.
    Item code      A word containing a user-supplied symbolic code
                   specifying the search item that $GETDTI is to use.
                   The $DTIDEF macro defines these codes. Each item
                   code is described in the Search Item Codes section
                   below.
    Buffer         A longword containing the user-supplied address
    address        of the buffer from which $GETDTI reads the search
                   information.
    Return         This longword is not used in the search item list,
    length         because all search items are read-only.
    address

 itmlst

    OpenVMS usage:item_list_3
    type:         descriptor list
    access:       read only
    mechanism:    by reference
    Item list specifying the transaction information that $GETDTI
    is to return. The itmlst argument is the address of a list of
    item descriptors, containing a single entry that describes an
    item of information. The list of item descriptors is terminated
    by a longword of 0. The item descriptor in the item list acts
    as an output argument to $GETDTI and as such is required to be
    writeable in caller's mode.

    Refer to the VSI OpenVMS System Services Reference Manual to view
    the single item descriptor format.

    The following table describes the itmlst item descriptor fields:

    Field          Description

    Buffer         A word containing a user-supplied integer
    length         specifying the length (in bytes) of the buffer
                   where $GETDTI is to write the information. The
                   length of the buffer needed depends on the item
                   code field of the search item descriptor. If
                   the value of buffer length is too small, $GETDTI
                   truncates the data and returns the condition code
                   value SS$_BUFFEROVF.
    Item code      A word containing a user-supplied symbolic code
                   specifying the search item that $GETDTI is to
                   use. The $DTIDEF macro defines these codes. Each
                   item code is described in the Itmlst Item Codes
                   section.
    Buffer         A longword containing the user-supplied address
    address        of the buffer where $GETDTI is to write the
                   information.
    return         A longword containing the user-supplied address
    length         of a word where $GETDTI writes return length
    address        information.