Messages in this thread | | | Date | Thu, 4 Jan 2001 02:09:56 +0100 (CET) | From | Peter Osterlund <> | Subject | Re: Printing to off-line printer in 2.4.0-prerelease |
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On Thu, 4 Jan 2001, Andrea Arcangeli wrote:
: I'm worried somebody needed to disable LP_CAREFUL to print, probably : it's not a big deal to keep it.
I removed it because otherwise I would have had to do twice as many tests to convince myself that all combinations of flags and printer states worked correctly. I can reinsert it if you think that's necessary. But then I don't think the tunelp man page and the comments in the kernel should say that it is obsolete. I think obsolete means "you should never ever have to use this stuff".
: However parport_write can still could silenty discard data, but maybe : it can't notice errors with some handshake.
At least with my printer, it only discards data when it is powered off. If you power off the printer between the times when lp_wait_ready returns and parport_write is called, I think it is ok to lose data. After all, if the power off had occurred a few ms later, the data would already have been in the printer when it was powered off, and then you would have lost data anyway.
: I didn't checked the details of the DMA based handshake so Tim needs : to comment if this can be considered a final/right fix (I hope it's : not ;).
I don't understand the lowlevel parport details, so I can not comment on this.
-- Peter Österlund peter.osterlund@mailbox.swipnet.se Sköndalsvägen 35 http://home1.swipnet.se/~w-15919 S-128 66 Sköndal +46 8 942647 Sweden
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