Argument

 

invo_context

   OpenVMS usage:invo_context_blk
   type:         structure
   access:       modify
   mechanism:    by reference

   Address of an invocation context block. The given context block
   is updated to represent the context of the previous (calling)
   frame.

   For the purposes of this function, the minimum fields of an
   invocation block that must be defined are those IREG and FREG
   fields corresponding to registers used by a context whether the
   registers are preserved or not. Note that the invocation context
   blocks written by the routines specified in these sections define
   all possible fields in a context block. Such context blocks
   satisfy this minimum requirement.