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chanconsts.def
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1996-08-29
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DEFINITION MODULE ChanConsts;
(* Common types and values for device open requests and results *)
(* Device modules may allow combinations of the following flags to be given
when a channel is opened. An open procedure may not accept or honor all
combinations. *)
TYPE
ChanFlags = (
readFlag, (* input operations are requested/available *)
writeFlag, (* output operations are requested/available *)
oldFlag, (* a file may/must/did exist before channel was opened *)
textFlag, (* text operations are requested/available *)
rawFlag, (* raw operations are requested/available *)
interactiveFlag, (* interactive use is requested/available *)
echoFlag (* echoing by interactive device on removal of
* characters from input stream requested/applies *)
);
FlagSet = SET OF ChanFlags;
(* Singleton values of FlagSet, to allow for example, read+write. *)
CONST
read = FlagSet{readFlag};
write = FlagSet{writeFlag};
old = FlagSet{oldFlag};
text = FlagSet{textFlag};
raw = FlagSet{rawFlag};
interactive = FlagSet{interactiveFlag};
echo = FlagSet{echoFlag};
TYPE
OpenResults = ( (* Possible results of open requests *)
opened, (* the open succeeded as requested *)
wrongNameFormat, (* given name is in the wrong format for the implementation *)
wrongFlags, (* given flags include a value that does not apply to device *)
tooManyOpen, (* this device cannot support any more open channels *)
outOfChans, (* no more channels can be allocated *)
wrongPermissions,(* file or directory permissions do not allow request *)
noRoomOnDevice, (* storage limits on the device prevent the open *)
noSuchFile, (* a needed file does not exist *)
fileExists, (* file of given name already exists, a new one is required *)
wrongFileType, (* file is of the wrong type to support required operations *)
noTextOperations,(* text operations have been requested but are not supported *)
noRawOperations, (* raw operations have been requested but are not supported *)
noMixedOperations,(*text and binary operations have been requested but they
are not supported in combination *)
alreadyOpen, (* the source/destination is already open for operations not
supported in combination with the requested operations *)
otherProblem (* open failed for some other reason *)
);
END ChanConsts.