I have noticed a number of odd-ball reactions to different combinations of
diald FIFO commands. Consider the following (assume no connection):
1. Enter UP, then UP again. Seems like diald then sets about trying to
bring up TWO identical connections.
2. Enter UP, then BLOCK. The block command is effectively ignored. BLOCK
should cancel all up commands and reset the modem to its "blocked" state.
3. Enter FORCE. Nothing happens. An isolated FORCE command should bring
up the link.
4. Enter UP, pause until dialing is under way (or thereabouts), then enter
DOWN. Nothing happens.
I would recommend the following reactions to different commands:
1. BLOCK: if the link is up (or in process of coming up) everything is
cancelled and the link is returned to a DOWN (and BLOCKed) state.
2. FORCE: if the link is down, the link is brought up and locked.
3. UP: if the link is up or in process of coming up, ignore the command.
4. DOWN: if the link is in process of coming up, cancel all appropriate
processes and return the link to a down state.
What are people's thoughts?
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