VMS Help  —  CRTL  glob  Return Values
    0                  Successful completion.
    GLOB_ABORTED       The scan was stopped because GLOB_ERROR was
                       set or errfunc returned a nonzero value.
    GLOB_NOMATCH       The pattern does not match any existing
                       pathname, and GLOB_NOCHECK was not set in
                       flags.
    GLOB_NOSPACE       An attempt to allocate memory failed.
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