Arguments

 

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 the option
   flag, described in $SET_DEFAULT_TRANS Option Flag. All undefined
   bits must be 0. If this argument is omitted, no flags are used.

   Table SYS-25 $SET_DEFAULT_TRANS Option Flag

   Flag Name      Description

   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 $SET_DEFAULT_TRANS
   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.
 

new_tid

   OpenVMS usage:trans_id
   type:         octaword (unsigned)
   access:       read only
   mechanism:    by reference
   The identifier (TID) of the new default transaction for the
   calling process. If this argument is zero (the default) or if it
   specifies a zero TID (an octaword of zeros), the service clears
   the default transaction of the calling process.
 

old_tid

   OpenVMS usage:trans_id
   type:         octaword (unsigned)
   access:       write only
   mechanism:    by reference
   An octaword in which the service returns the identifier (TID) of
   the calling process' previous transaction (the one that was set
   or cleared by this call to $SET_DEFAULT_TRANS).

   A zero TID is returned if the calling process did not have a
   default transaction prior to the call.