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NAME
    AttemptLockDosList -- Attempt to lock the Dos Lists for use (V36)

SYNOPSIS
    dlist = AttemptLockDosList(flags)
    D0                          D1

    struct doslist *attemptlockdoslist(ulong)

FUNCTION
    Locks the dos device list in preparation to walk the list.  If the
    list is 'busy' then this routine will return NULL.  See lockdoslist()
    for more information.

INPUTS
    flags - Flags stating which types of nodes you want to lock.

RESULT
    dlist - Pointer to the beginning of the list or NULL.  Not a valid
            node!

SEE ALSO
    lockdoslist(), unlockdoslist(), forbid(), nextdosentry()