This key is used by the code described at (p3,erep).

KERRORWAIT(oc,((8,sequence),(2,class mask)) ==> c, ((8,sequence), (2,message class), (2,messagetype), (ml,message))

oc = 0 - Return selected message or wait for one.

oc = 1 - Return selected message or "no message found".

The selected message is the message with the lowest sequence higher than the one presented where (class mask & message class) ~= 0. Sequence is the TOD of the entry. The returned sequence may be presented on the next KERRORWAIT call to insure that all messages are received.

Each message has a 16 bit class with one and only one bit on. They are assigned as follows:

0001 indicating an informational message

0002 indicating an urgent message {one requiring operator action such as a disk going offline}.

Other classes of message may be introduced at a later time.

Message type is a 2 byte binary field indicating the message type, with 0 indicating that the message is in OBR {that IBM term again} format, 1 is reserved for TYMNET error messages and no others are yet defined.

Return Codes

0 = message presented and no other messages meeting the selection criteria are available

1 = message presented and other messages meeting the selection criteria are available

2 = No selected messages and order code one

3 = class specification is 0 or is missing