remove prototypes with no matching function; ok ratchov@

spelling fixes; from paul tagliamonte
any changes not taken noted on tech, but chiefly here i did not take the
cancelation - cancellation changes;

Add sio_flush(3) function to stop playback immediately

The new sio_flush(3) functions works the same way as sio_stop(3),
except that it doesn't wait for play buffer to be drained. Instead,
it discar

Add sio_flush(3) function to stop playback immediately

The new sio_flush(3) functions works the same way as sio_stop(3),
except that it doesn't wait for play buffer to be drained. Instead,
it discards its contents and returns immediately.

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Move to the <limits.h> universe.
review by millert, binary checking process with doug, concept with guenther

- use relative read/write positions to keep track of buffer
usage as seen by the caller
- refresh current position before reading/writing data, to keep the
current position always consistent with

- use relative read/write positions to keep track of buffer
usage as seen by the caller
- refresh current position before reading/writing data, to keep the
current position always consistent with read & write pointers
- fix confusion between processed samples by the hardware (as reported
by GET{I,O}OFFS) and samples played as reported by GETINFO(). Fixes
incorrect delta propagated after xruns in play-only and rec-only
modes
- don't wait for POLLIN or POLLOUT to be set to refresh ring pointers,
as they may not be set in certain cases. Fixes sndiod crash after
few days of continuous playback.
- save current parameters instead of calling getpar() too often

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Prefix by '_' symbols that are not part of the API.

ok deraadt, guenther

Move underrun/overrun recovery code from the sun-api back-end to
the the generic code, so it can be used by other back-ends as well.
No behavior change (hopefully).

Handle big time_t.
Use clock_gettime(CLOCK_MONOTONIC) instead of gettimeofday() when measuring
time intervals for debugging output.

ok ratchov@

crank SIO_MAXNFDS

in sio_psleep(), use an array of SIO_MAXNFDS pollfd strucures rather
than a single one. No behaviour change

Make aucat audio and midi backends share the same code to communicate
with the server. As we're at it use the same protocol for midi and
audio. Now, both audio and midi code use the same SNDIO_DEBUG

Make aucat audio and midi backends share the same code to communicate
with the server. As we're at it use the same protocol for midi and
audio. Now, both audio and midi code use the same SNDIO_DEBUG environment
variable to turn on/off DPRINTF's.

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Clean up function naming: use sio_<backend>_ prefix for private
audio-related functions and put them in files named sio_<backend>.c
No behaviour changes.