Workaround IXOFF bug when output queue is full && RTS control is on

Incorporate bde's code-review comments.

(a) bring back ttselect, now that we have xxxdevtotty() it isn't dangerous.
(b) remove all of the wrappers that have been replaced by ttselect
(c) fix formatt

Incorporate bde's code-review comments.

(a) bring back ttselect, now that we have xxxdevtotty() it isn't dangerous.
(b) remove all of the wrappers that have been replaced by ttselect
(c) fix formatting in syscons.c and definition in syscons.h
(d) add cxdevtotty

NOT DONE:
(e) make pcvt work... it was already broken...when someone fixes pcvt to
link properly, just rename get_pccons to xxxdevtotty and we're done

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same

(a) remove the pointer to each driver's tty structure array from cdevsw
(b) add a function callback vector to tty drivers that will return a pointer
to a valid tty structure based upon a dev_t
(c

(a) remove the pointer to each driver's tty structure array from cdevsw
(b) add a function callback vector to tty drivers that will return a pointer
to a valid tty structure based upon a dev_t
(c) make syscons structures the same size whether or not APM is enabled so
utilities don't crash if NAPM changes (and make the damn kernel compile!)
(d) rewrite /dev/snp ioctl interface so that it is device driver and i386
independant

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Add releasing of input flow control into
ttyflush(FREAD)

Add two IXOFF checks to not confuse with CRTS_IFLOW.
Now TS_TBLOCK used as general input flow flag
for both IXOFF and CRTS_IFLOW cases.

Revive hadrware input flow control
Submitted by: iverson@lionheart.com

Restore deleted in second time my & bde fixes.
UGEN STOP IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

More changes to support user calls.
It's 22:00 here,utility still to come(hopefully tomorrow
morning..)

Remove duplicated code from ttymalloc(). Disable ttyfree().

Restore fixes to flushing that were lost in the previous commit.

Clean up snoop changes.

Add my TODO list from 1.1.5. The improvements

Remove duplicated code from ttymalloc(). Disable ttyfree().

Restore fixes to flushing that were lost in the previous commit.

Clean up snoop changes.

Add my TODO list from 1.1.5. The improvements in 1.1.5 should be "obtained"
first.

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Here it came-the all-brand-new snoop device..
Users-beware..
It is tested and working for me but probably have some bugs i
didn't noticed so test it and reply...
It can:
look at what's sent to the u

Here it came-the all-brand-new snoop device..
Users-beware..
It is tested and working for me but probably have some bugs i
didn't noticed so test it and reply...
It can:
look at what's sent to the user from tty device
snoop on pty's,vty's and serial tty's
It (still) can't:
write to tty
see what user types in local echo mode
It is probably bad styled and
very dependant on tty_pty.c,sio.c and syscons.c
I would be really happy if another ppl would make their
changes because i am not sure this is the best snoop
we can have..but it is good..:)))))

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Purge queues in ttylclose(), if ttywflush() failed

Replace previous fix with less agressive, just return EIO
if ttywait can't drain queue.

1. If some output still present at the end of ttywait, kill it.
2. Even if ttywait() fails, call ttyflush(FREAD) in ttywflush.
This two fixes guarantee that queues are empty after calling ttywflush()

1. If some output still present at the end of ttywait, kill it.
2. Even if ttywait() fails, call ttyflush(FREAD) in ttywflush.
This two fixes guarantee that queues are empty after calling ttywflush()
in any case

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>32 PTY support
Submitted by: Heikki Suonsivu <hsu@cs.hut.fi>

Disable bogus attempt to switch from the TS_ISOPEN state to the
TS_WOPEN state when CLOCAL is toggled from on to off while there
is no carrier. There is no way back, and with sio there is no way
for

Disable bogus attempt to switch from the TS_ISOPEN state to the
TS_WOPEN state when CLOCAL is toggled from on to off while there
is no carrier. There is no way back, and with sio there is no way
forward either (TS_ISOPEN will never be set again for the current
open). This bug was observed in 1.1 and was fixed in 1.1.5.

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Increase the reserved clist space for the raw queue from 512 to TTYHOG.
This might help avoid tty buffer overflows on loaded systems.

Fix error handling for new TIOCSDRAINWAIT ioctl.

Fight against hanging modems: add timeout to ttywait.
Reviewed by: Bruce

Call d_stop in ttyflush not only for WRITE but for READ too
Obtained from: 1.1.5.1

Fix cblock starvation bugs by reserving enough cblocks for minimal
operation of each clist. Limit the growth of each clist. Clists
can only grow larger than the reserved minimum if there are free
c

Fix cblock starvation bugs by reserving enough cblocks for minimal
operation of each clist. Limit the growth of each clist. Clists
can only grow larger than the reserved minimum if there are free
cblocks in a shared pool. The size of this pool is now fixed
(this could be improved). The reserved and maximum sizes are more
carefully allocated for slip and ppp, depending on the mtu. A maximum
MTU of 16384 is now enforced for ppp.

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Don't block for output in non-blocking mode if clists run out.

Remove an unnecessary test (if the output queue is above high water
then it is nonempty).

Return immediately from ttwrite() if the ttysleep()s that wait for
a clist return with an error. There are some clist starvation/deadlock
bugs elsewhere and killing clist hogs didn't help because th

Return immediately from ttwrite() if the ttysleep()s that wait for
a clist return with an error. There are some clist starvation/deadlock
bugs elsewhere and killing clist hogs didn't help because the breaks
only exited from the inner loops.

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Round down instead of up in 'kerninfo'/ctrl-T stats code. Incorrect output
can result otherwise.

Submitted by: John Dyson

ttywait: check conditions again right after oproc
Obtained from: (I know, but can't say :-)