$UPDSECW

   Writes all modified pages in an active private or global section
   back into the section file on disk. One or more I/O requests are
   queued, based on the number of pages that have been modified.

   The $UPDSECW service completes synchronously; that is, it returns
   to the caller after writing all updated pages.

   For asynchronous completion, use the Update Section File on Disk
   ($UPDSEC) service; $UPDSEC returns to the caller after queuing
   the update request, without waiting for the pages to be updated.

   In all other respects, $UPDSECW is identical to $UPDSEC. For
   additional information about the $UPDSECW service, see the
   description of $UPDSEC.

   Format

     SYS$UPDSECW  inadr [,retadr] [,acmode] [,updflg] [,efn] [,iosb]

                  [,astadr] [,astprm]

   C Prototype

     int sys$updsecw  (struct _va_range *inadr, struct _va_range

                      *retadr, unsigned int acmode, char updflg,

                      unsigned int efn, struct _iosb *iosb, void

                      (*astadr)(__unknown_params), int astprm);