sndiod: Fix SIGHUP to reopen the devices in priority order

With this commit, SIGHUP makes sndiod discover new devices and if
there is a new device with higher priority (greater -F option number)
than the current one, sndiod switches to it. If the current device is
already the one with the highest priority (i.e. last -F), then SIGHUP
does nothing.

Stop binding audio devices exposed by sndiod to physical devices

This a shift towards a new model: clients connect to logical devices
(created with -s option) then the server routes data to/from the
underlying physical device (registered with -f option). The binding
may be changed at run-time with the server.device control exposed by
sndioctl(1).

As audio devices exposed by sndiod(8) are not bound to fixed physical
devices anymore, the physical audio device number component of
sndio(7) descriptors was removed.

fixes, help from and ok denis, edd

When an audio device is disconnected, drop MIDI clients controlling it

On error, drop clients and close the device only if it's still open

Fixes crashes when USB devices are disconnected, caused by an attempt
to close the already closed device: it was closed once when its ref
counter drops to zero (after the last client is disconnected) and once
with an explicit call to dev_close() on the error code-path.

Get a reference to the device when "snd/N" MIDI ports are opened

As the master output level control is not in software any longer the
device needs to opened for adjustments to work.

Accept MIDI clients that don't reset status during sysex messages.

The MIDI protocol requires the status byte to be resent after common
messages, including system exclusive messages. But, some MIDI clients
forget to resend it; we workaround this restoring the status byte
after sysex messages.

Allow switching between devices without disconnecting clients.

The new -F option allows alternate device to be specified. If the
device is disconnected, the one given with the last -f or -F options
will be used instead. Similarly, the new -Q option allows an alternate
MIDI port to be specified.

ok mpi@

Fix wrong comment about MIDI port hold flag

Make midi->tickets signed (sign is needed for arithmetics even if the
actual count is always positive). Found by David Coppa. Thanks.

save port number if port structure

add missing prototypes

drain midi port output buffer before closing it ensuring the last
few bytes are not lost

use the hold flag for midi ports as well

For MIDI ports, use the same open/close logic as for audio devices:
drop clients using it when the port is closed (eg. umidi disconnected)
and try to reopen it whenever a new client connects.

Process incoming MIDI data on the fly rather than using an
input fifo; besides being simpler, this way there's no data
to drain when a connection is dropped.

Remplace aucat server by a new sndiod daemon aimed to be simpler
smaller and faster than aucat. It's a drop in replacement with the
following exceptions that don't affect the default setup:
- The sample rate and the encoding are a per-device parameters
thus -r and -e options must precede the corresponding -f option
- MIDI thru boxes are dynamically created and no -M option
is required anymore, so -M was removed.
- MIDI ports are exposed with a new ``midi/N'' name, rather
than abusing MIDI thru boxes.
with help from armani@, ok deraadt@

Stop binding audio devices exposed by sndiod to physical devices

This a shift towards a new model: clients connect to logical devices
(created with -s option) then the server routes data to/from the
underlying physical device (registered with -f option). The binding
may be changed at run-time with the server.device control exposed by
sndioctl(1).

As audio devices exposed by sndiod(8) are not bound to fixed physical
devices anymore, the physical audio device number component of
sndio(7) descriptors was removed.

fixes, help from and ok denis, edd

When an audio device is disconnected, drop MIDI clients controlling it

On error, drop clients and close the device only if it's still open

Fixes crashes when USB devices are disconnected, caused by an attempt
to close the already closed device: it was closed once when its ref
counter drops to zero (after the last client is disconnected) and once
with an explicit call to dev_close() on the error code-path.

Get a reference to the device when "snd/N" MIDI ports are opened

As the master output level control is not in software any longer the
device needs to opened for adjustments to work.

Accept MIDI clients that don't reset status during sysex messages.

The MIDI protocol requires the status byte to be resent after common
messages, including system exclusive messages. But, some MIDI clients
forget to resend it; we workaround this restoring the status byte
after sysex messages.

Allow switching between devices without disconnecting clients.

The new -F option allows alternate device to be specified. If the
device is disconnected, the one given with the last -f or -F options
will be used instead. Similarly, the new -Q option allows an alternate
MIDI port to be specified.

ok mpi@

Fix wrong comment about MIDI port hold flag

Make midi->tickets signed (sign is needed for arithmetics even if the
actual count is always positive). Found by David Coppa. Thanks.

save port number if port structure

add missing prototypes

drain midi port output buffer before closing it ensuring the last
few bytes are not lost

use the hold flag for midi ports as well

For MIDI ports, use the same open/close logic as for audio devices:
drop clients using it when the port is closed (eg. umidi disconnected)
and try to reopen it whenever a new client connects.

Process incoming MIDI data on the fly rather than using an
input fifo; besides being simpler, this way there's no data
to drain when a connection is dropped.

Remplace aucat server by a new sndiod daemon aimed to be simpler
smaller and faster than aucat. It's a drop in replacement with the
following exceptions that don't affect the default setup:
- The sample rate and the encoding are a per-device parameters
thus -r and -e options must precede the corresponding -f option
- MIDI thru boxes are dynamically created and no -M option
is required anymore, so -M was removed.
- MIDI ports are exposed with a new ``midi/N'' name, rather
than abusing MIDI thru boxes.
with help from armani@, ok deraadt@

When an audio device is disconnected, drop MIDI clients controlling it

On error, drop clients and close the device only if it's still open

Fixes crashes when USB devices are disconnected, caused by an attempt
to close the already closed device: it was closed once when its ref
counter drops to zero (after the last client is disconnected) and once
with an explicit call to dev_close() on the error code-path.

Get a reference to the device when "snd/N" MIDI ports are opened

As the master output level control is not in software any longer the
device needs to opened for adjustments to work.

Accept MIDI clients that don't reset status during sysex messages.

The MIDI protocol requires the status byte to be resent after common
messages, including system exclusive messages. But, some MIDI clients
forget to resend it; we workaround this restoring the status byte
after sysex messages.

Allow switching between devices without disconnecting clients.

The new -F option allows alternate device to be specified. If the
device is disconnected, the one given with the last -f or -F options
will be used instead. Similarly, the new -Q option allows an alternate
MIDI port to be specified.

ok mpi@

Fix wrong comment about MIDI port hold flag

Make midi->tickets signed (sign is needed for arithmetics even if the
actual count is always positive). Found by David Coppa. Thanks.

save port number if port structure

add missing prototypes

drain midi port output buffer before closing it ensuring the last
few bytes are not lost

use the hold flag for midi ports as well

For MIDI ports, use the same open/close logic as for audio devices:
drop clients using it when the port is closed (eg. umidi disconnected)
and try to reopen it whenever a new client connects.

Process incoming MIDI data on the fly rather than using an
input fifo; besides being simpler, this way there's no data
to drain when a connection is dropped.

Remplace aucat server by a new sndiod daemon aimed to be simpler
smaller and faster than aucat. It's a drop in replacement with the
following exceptions that don't affect the default setup:
- The sample rate and the encoding are a per-device parameters
thus -r and -e options must precede the corresponding -f option
- MIDI thru boxes are dynamically created and no -M option
is required anymore, so -M was removed.
- MIDI ports are exposed with a new ``midi/N'' name, rather
than abusing MIDI thru boxes.
with help from armani@, ok deraadt@

On error, drop clients and close the device only if it's still open

Fixes crashes when USB devices are disconnected, caused by an attempt
to close the already closed device: it was closed once when its ref
counter drops to zero (after the last client is disconnected) and once
with an explicit call to dev_close() on the error code-path.

Get a reference to the device when "snd/N" MIDI ports are opened

As the master output level control is not in software any longer the
device needs to opened for adjustments to work.

Accept MIDI clients that don't reset status during sysex messages.

The MIDI protocol requires the status byte to be resent after common
messages, including system exclusive messages. But, some MIDI clients
forget to resend it; we workaround this restoring the status byte
after sysex messages.

Allow switching between devices without disconnecting clients.

The new -F option allows alternate device to be specified. If the
device is disconnected, the one given with the last -f or -F options
will be used instead. Similarly, the new -Q option allows an alternate
MIDI port to be specified.

ok mpi@

Fix wrong comment about MIDI port hold flag

Make midi->tickets signed (sign is needed for arithmetics even if the
actual count is always positive). Found by David Coppa. Thanks.

save port number if port structure

add missing prototypes

drain midi port output buffer before closing it ensuring the last
few bytes are not lost

use the hold flag for midi ports as well

For MIDI ports, use the same open/close logic as for audio devices:
drop clients using it when the port is closed (eg. umidi disconnected)
and try to reopen it whenever a new client connects.

Process incoming MIDI data on the fly rather than using an
input fifo; besides being simpler, this way there's no data
to drain when a connection is dropped.

Remplace aucat server by a new sndiod daemon aimed to be simpler
smaller and faster than aucat. It's a drop in replacement with the
following exceptions that don't affect the default setup:
- The sample rate and the encoding are a per-device parameters
thus -r and -e options must precede the corresponding -f option
- MIDI thru boxes are dynamically created and no -M option
is required anymore, so -M was removed.
- MIDI ports are exposed with a new ``midi/N'' name, rather
than abusing MIDI thru boxes.
with help from armani@, ok deraadt@

Get a reference to the device when "snd/N" MIDI ports are opened

As the master output level control is not in software any longer the
device needs to opened for adjustments to work.

Accept MIDI clients that don't reset status during sysex messages.

The MIDI protocol requires the status byte to be resent after common
messages, including system exclusive messages. But, some MIDI clients
forget to resend it; we workaround this restoring the status byte
after sysex messages.

Allow switching between devices without disconnecting clients.

The new -F option allows alternate device to be specified. If the
device is disconnected, the one given with the last -f or -F options
will be used instead. Similarly, the new -Q option allows an alternate
MIDI port to be specified.

ok mpi@

Fix wrong comment about MIDI port hold flag

Make midi->tickets signed (sign is needed for arithmetics even if the
actual count is always positive). Found by David Coppa. Thanks.

save port number if port structure

add missing prototypes

drain midi port output buffer before closing it ensuring the last
few bytes are not lost

use the hold flag for midi ports as well

For MIDI ports, use the same open/close logic as for audio devices:
drop clients using it when the port is closed (eg. umidi disconnected)
and try to reopen it whenever a new client connects.

Process incoming MIDI data on the fly rather than using an
input fifo; besides being simpler, this way there's no data
to drain when a connection is dropped.

Remplace aucat server by a new sndiod daemon aimed to be simpler
smaller and faster than aucat. It's a drop in replacement with the
following exceptions that don't affect the default setup:
- The sample rate and the encoding are a per-device parameters
thus -r and -e options must precede the corresponding -f option
- MIDI thru boxes are dynamically created and no -M option
is required anymore, so -M was removed.
- MIDI ports are exposed with a new ``midi/N'' name, rather
than abusing MIDI thru boxes.
with help from armani@, ok deraadt@

Accept MIDI clients that don't reset status during sysex messages.

The MIDI protocol requires the status byte to be resent after common
messages, including system exclusive messages. But, some MIDI clients
forget to resend it; we workaround this restoring the status byte
after sysex messages.

Allow switching between devices without disconnecting clients.

The new -F option allows alternate device to be specified. If the
device is disconnected, the one given with the last -f or -F options
will be used instead. Similarly, the new -Q option allows an alternate
MIDI port to be specified.

ok mpi@

Fix wrong comment about MIDI port hold flag

Make midi->tickets signed (sign is needed for arithmetics even if the
actual count is always positive). Found by David Coppa. Thanks.

save port number if port structure

add missing prototypes

drain midi port output buffer before closing it ensuring the last
few bytes are not lost

use the hold flag for midi ports as well

For MIDI ports, use the same open/close logic as for audio devices:
drop clients using it when the port is closed (eg. umidi disconnected)
and try to reopen it whenever a new client connects.

Process incoming MIDI data on the fly rather than using an
input fifo; besides being simpler, this way there's no data
to drain when a connection is dropped.

Remplace aucat server by a new sndiod daemon aimed to be simpler
smaller and faster than aucat. It's a drop in replacement with the
following exceptions that don't affect the default setup:
- The sample rate and the encoding are a per-device parameters
thus -r and -e options must precede the corresponding -f option
- MIDI thru boxes are dynamically created and no -M option
is required anymore, so -M was removed.
- MIDI ports are exposed with a new ``midi/N'' name, rather
than abusing MIDI thru boxes.
with help from armani@, ok deraadt@

Allow switching between devices without disconnecting clients.

The new -F option allows alternate device to be specified. If the
device is disconnected, the one given with the last -f or -F options
will be used instead. Similarly, the new -Q option allows an alternate
MIDI port to be specified.

ok mpi@

Fix wrong comment about MIDI port hold flag

Make midi->tickets signed (sign is needed for arithmetics even if the
actual count is always positive). Found by David Coppa. Thanks.

save port number if port structure

add missing prototypes

drain midi port output buffer before closing it ensuring the last
few bytes are not lost

use the hold flag for midi ports as well

For MIDI ports, use the same open/close logic as for audio devices:
drop clients using it when the port is closed (eg. umidi disconnected)
and try to reopen it whenever a new client connects.

Process incoming MIDI data on the fly rather than using an
input fifo; besides being simpler, this way there's no data
to drain when a connection is dropped.

Remplace aucat server by a new sndiod daemon aimed to be simpler
smaller and faster than aucat. It's a drop in replacement with the
following exceptions that don't affect the default setup:
- The sample rate and the encoding are a per-device parameters
thus -r and -e options must precede the corresponding -f option
- MIDI thru boxes are dynamically created and no -M option
is required anymore, so -M was removed.
- MIDI ports are exposed with a new ``midi/N'' name, rather
than abusing MIDI thru boxes.
with help from armani@, ok deraadt@

Fix wrong comment about MIDI port hold flag

Make midi->tickets signed (sign is needed for arithmetics even if the
actual count is always positive). Found by David Coppa. Thanks.

save port number if port structure

add missing prototypes

drain midi port output buffer before closing it ensuring the last
few bytes are not lost

use the hold flag for midi ports as well

For MIDI ports, use the same open/close logic as for audio devices:
drop clients using it when the port is closed (eg. umidi disconnected)
and try to reopen it whenever a new client connects.

Process incoming MIDI data on the fly rather than using an
input fifo; besides being simpler, this way there's no data
to drain when a connection is dropped.

Remplace aucat server by a new sndiod daemon aimed to be simpler
smaller and faster than aucat. It's a drop in replacement with the
following exceptions that don't affect the default setup:
- The sample rate and the encoding are a per-device parameters
thus -r and -e options must precede the corresponding -f option
- MIDI thru boxes are dynamically created and no -M option
is required anymore, so -M was removed.
- MIDI ports are exposed with a new ``midi/N'' name, rather
than abusing MIDI thru boxes.
with help from armani@, ok deraadt@

Make midi->tickets signed (sign is needed for arithmetics even if the
actual count is always positive). Found by David Coppa. Thanks.

save port number if port structure

add missing prototypes

drain midi port output buffer before closing it ensuring the last
few bytes are not lost

use the hold flag for midi ports as well

For MIDI ports, use the same open/close logic as for audio devices:
drop clients using it when the port is closed (eg. umidi disconnected)
and try to reopen it whenever a new client connects.

Process incoming MIDI data on the fly rather than using an
input fifo; besides being simpler, this way there's no data
to drain when a connection is dropped.

Remplace aucat server by a new sndiod daemon aimed to be simpler
smaller and faster than aucat. It's a drop in replacement with the
following exceptions that don't affect the default setup:
- The sample rate and the encoding are a per-device parameters
thus -r and -e options must precede the corresponding -f option
- MIDI thru boxes are dynamically created and no -M option
is required anymore, so -M was removed.
- MIDI ports are exposed with a new ``midi/N'' name, rather
than abusing MIDI thru boxes.
with help from armani@, ok deraadt@