NAME
        FindSemaphore -- find a given system signal semaphore

   SYNOPSIS
        signalSemaphore = FindSemaphore(name)
        D0                              A1

        struct signalsemaphore *findsemaphore(strptr);

   FUNCTION
        This function will search the system signal semaphore list for a
        semaphore with the given name.  The first semaphore matching this
        name will be returned.

        This function does not arbitrate for access to the semaphore list,
        surround the call with a forbid()/permit() pair.

   INPUT
        name - name of the semaphore to find

   RESULT
        semaphore - a pointer to the signal semaphore, or zero if not
                    found.