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READ statement, for example, always produces the same BFS call, regardless of what filing system is actually being accessed by the read logic. By extension, all MFSs must use the same calling conventions.
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declare subroutine fsmsg , attach_table, msg
OPEN 'SYSTABLES' TO FILES.FILE ELSE
fsmsg()
return
end
OPEN 'SYSVOLUMES' TO VOLUMES.FILE ELSE
fsmsg()
return
end
FILENAME = 'TESTFILE'
MFS.NAME = 'MYMFS.MFS'
READ FILES.REC FROM FILES.FILE, FILENAME ELSE
fsmsg()
return
END
VOLUME.NAME = FILES.REC<1> ; * get the name of the volume
READ VOLUME.REC FROM VOLUMES.FILE, VOLUME.NAME ELSE
fsmsg()
return
END
* construct the file handle for the REVMEDIA map in question
MEDIA.HANDLE = VOLUME.REC<4> : @VM : VOLUME.REC<5>
* construct the key (file.name*account.name) for the file.
* this information is stored in the SYSTABLES file
MEDIA.MAP.KEY = FILES.REC<2> :"*": FILES.REC<3>
* update the media map entry with the MFS info. MFS lists are
* stored as the 2nd attribute of the media map entry for a file
READ MEDIA.MAP.REC FROM MEDIA.HANDLE, MEDIA.MAP.KEY THEN
* put new MFS name on front of existing MFS list
OLD.MFS.LIST = MEDIA.MAP.REC<2>
NEW.MFS.LIST = MFS.NAME : @VM : OLD.MFS.LIST
MEDIA.MAP.REC<2> = NEW.MFS.LIST
WRITE MEDIA.MAP.REC TO MEDIA.HANDLE, MEDIA.MAP.KEY ELSE
fsmsg()
return
END
* reattach file to update SYSTABLES entry
Attach_Table(FILES.REC<1>,FILES.REC<2>,'','')
END ELSE
MSG(@window, "Cannot read ":MEDIA.MAP.KEY,'')
return
END ; * read media.map rec
RETURN 0 |
