Allows a process to specify what action system services should
    take when system resources required for their execution are
    unavailable.

                                 CAUTION

       Disabling resource waiting should be performed with caution,
       as doing so can have unexpected effects on constituent
       sharable images and runtime libraries.

    Format

      SYS$SETRWM  [watflg]

    C Prototype

      int sys$setrwm  ( char watflg);