Commit graph

74 commits

Author SHA1 Message Date
Johan Hedberg
09e86f3b69 Bluetooth: Host: Remove HCI ECC emulation
Remove the HCI command & event emulation layer for ECDH commands and
events. This means that we always do the necessary operations in the host.
The existing BT_ECC Kconfig option stays, but now gets automatically
enabled when necessary (e.g. based on the BT_SMP option), which is why this
commit removes so many explicit assignments in prj.conf files.

Signed-off-by: Johan Hedberg <johan.hedberg@silabs.com>
2025-01-23 10:14:46 +01:00
Fredrik Danebjer
21b5f0c4fe Bluetooth: pacs: Add dynamic PACS registration
Added option to set the PACS Characteristics through the bap API,
making PACS configuration runtime available. Source and Sink PAC, as
well as Source/Sink PAC Location is can be set through a register
function in the PACS api.

Signed-off-by: Fredrik Danebjer <frdn@demant.com>
2025-01-22 15:49:50 +01:00
Valerio Setti
f4592382bb bt: use PSA for HCI ECC and rename BT_TINYCRYPT_ECC
This commit sets PSA Crypto API as the default library to perform
ECC-DH in HCI, replacing TinyCrypt (which is being deprecated).
Therefore the symbol BT_TINYCRYPT_ECC is renamed as BT_SEND_ECC_EMULATION.
References in samples/tests are also fixed.

Signed-off-by: Valerio Setti <vsetti@baylibre.com>
2024-11-27 16:40:47 -05:00
Emil Gydesen
7a72280d01 Bluetooth: HAS: Change select UTF8 to depends on
Change the select to a depends on for the Kconfig options
for HAS and HAS_CLIENT.

This is an effort to reduce the number of selects used by
LE Audio.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-11-21 09:19:47 +01:00
Emil Gydesen
4c86a5cc8d Bluetooth: BAP: Depend on BT_PAC_{SNK,SRC} instead of select
Modify ASCS and BAP Broadcast sink to depend on the PAC options
instead of selecting them.

Since Kconfig does not support "depends on X if Y",
a select for PAC_{SRC,SNK} is used depending on
ASCS_ASE_{SRC,SNK}.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-11-21 09:19:47 +01:00
Emil Gydesen
df6b5981bf Bluetooth: Audio: depends on GATT instead of select
Modify the Kconfig options to depend on the GATT
features rather than selecting them.

This is part of an effort to reduce the amount of
selects we use in LE Audio.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-11-21 09:19:47 +01:00
Abderrahmane Jarmouni
3a4dbd4a73 samples: sample.yaml: replace deprecated OVERLAY_CONFIG w\ EXTRA_CONF_FILE
Replace some OVERLAY_CONFIG that were missed in a pervious PR.

Signed-off-by: Abderrahmane Jarmouni <git@jarmouni.me>
2024-10-24 14:06:54 +02:00
Babak Arisian
7f820d59c0 Bluetooth: Audio: Update SCAN_DELEGATOR dependency to GATT_DYNAMIC_DB
Changed dependency of the BT_BAP_SCAN_DELEGATOR to GATT_DYNAMIC_DB
from 'select' to 'depends on' and solved all loop dependencies
caused by this change.

Fixes #79108

Signed-off-by: Babak Arisian <bbaa@demant.com>
2024-10-23 16:53:37 +02:00
Emil Gydesen
dc97bbd35f Bluetooth: Audio: Rename bt_audio_codec_qos -> bt_bap_qos_cfg
The QoS structure is not related to a codec, but rather a
stream, and should thus not use the "Codec" name.

The BAP and ASCS specs refer to the QoS as
"QoS configuration" several places, so it is an obvious
choice for a name.

Since the structure is defined and used by BAP, the prefix
was changed from bt_audio to bt_bap.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-10-04 16:34:22 +01:00
Emil Gydesen
9658b7d0d3 samples: Bluetooth: Audio: Avoid uisng K_FOREVER in syswq
Several samples used K_FOREVER when allocating buffers in the
system workqueue thread, which is prohibited.

The samples should rather retry later if TX fails.

This is not the ideal solution for the samples, but
fixes a bug. Ideally the samples would use a dedicated thread
to handle TX, instead of the system workqueue.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-10-02 15:53:37 +02:00
Alberto Escolar Piedras
1a5ff2cee2 samples/bluetooth/hap_ha: Don't test on native_posix
native_posix is now deprecated.
Building this sample in both native_sim and native_posix
does not improve coverage for the sample but doubles CI time.
As anyhow native_posix will be removed all together in
2 releases, let's remove it already for this sample.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
2024-09-25 04:04:36 -04:00
Benjamin Cabé
1db9b009a7 doc: samples: Adopt code-sample-category across tree
This commit uses the new .. zephyr:code-sample-category directive to
categorize code samples across the tree.
Updates existing legacy references to manually defined targets to now
use :zephyr:code-sample-category: role instead.

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
2024-09-23 12:00:00 +02:00
Fredrik Danebjer
c9da274eb2 Bluetooth: ascs: Add dynamic ASE registration
Added option to set the ASE count through the bap API, making ASE
configuration runtime available. The upper limit of ASEs are still
bound by the Kconfig options set for ASEs.

Signed-off-by: Fredrik Danebjer <frdn@demant.com>
2024-09-11 07:41:12 -04:00
Benjamin Cabé
d23d19d7f0 samples: bluetooth: use zephyr:code-sample directive
Describe the samples using code-sample directive in preparation for
upcoming changes to the Zephyr documentation that will be leveraging
the provided description and metadata.

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
2024-09-05 16:58:32 -04:00
Emil Gydesen
57b35e1047 Bluetooth: TBS: Allow multiple callbacks for client
The TBS client callbacks are just informative so we
provide the information to multiple listeners.

To support this for the long strings, the function
handle_string_long_read was refactored.

This also allows for multiple users of the TBS client.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-09-05 12:24:47 +01:00
Nithin Ramesh Myliattil
baa5683e59 bluetooth: BAS: add battery level status char to bas service
Added the battery level status char to bas service
as per bas_1.1 spec. Added BSIM test for BAS service
to test the NTF/INDs of BAS characteristics.

Signed-off-by: Nithin Ramesh Myliattil <niym@demant.com>
2024-08-20 18:59:14 -04:00
Chang An
e8db417a00 LE Audio: add conn parameter for bt_vcp_vol_rend_cb
Add conn parameter to status/flags callbacks of bt_vcp_vol_rend_cb
to differentiate between remote and local changes.

Signed-off-by: Chang An <chang.an_1@nxp.com>
2024-08-20 14:45:35 +02:00
Rubin Gerritsen
a4e43d013c Bluetooth: Samples: Use string printing functions for error codes
When developing Bluetooth applications, you typically run into some errors.
If you are an experienced Bluetooth developer, you would typically know
how to translate the error codes into string representations.
Others might not.

This commit to adds string printing of error codes for all
samples to make them more user-friendly.

Several formatting alternatives were considered. The chosen alternative
balances code readability and FLASH size (with and without string
printing).

Example output from the peripheral_hids sample when the
peer rejects pairing:

```
Bluetooth initialized
Bluetooth authentication callbacks registered.
Advertising successfully started
Connected 5E:67:02:D3:1C:DB (random)
Security failed: 5E:67:02:D3:1C:DB (random) \
level 1 err 6 BT_SECURITY_ERR_PAIR_NOT_ALLOWED
Disconnected from 5E:67:02:D3:1C:DB (random), \
reason 0x13 BT_HCI_ERR_REMOTE_USER_TERM_CONN
```

Other alternatives that were considered:

- Use of parantheses:
```
// strings enabled
Security failed: 5E:67:02:D3:1C:DB (random) level 1 \
err BT_SECURITY_ERR_PAIR_NOT_ALLOWED(6)
Disconnected from 5E:67:02:D3:1C:DB (random), reason \
BT_HCI_ERR_REMOTE_USER_TERM_CONN(0x13)
// strings disabled
Security failed: 5E:67:02:D3:1C:DB (random) level 1 err (6)
Disconnected from 5E:67:02:D3:1C:DB (random), reason (0x13)
```

- Spaces and parantheses:
```
// strings enabled
Security failed: 5E:67:02:D3:1C:DB (random) level 1 \
err BT_SECURITY_ERR_PAIR_NOT_ALLOWED (6)
Disconnected from 5E:67:02:D3:1C:DB (random), \
reason BT_HCI_ERR_REMOTE_USER_TERM_CONN (0x13)
// strings disabled
Security failed: 5E:67:02:D3:1C:DB (random) level 1 err  (6)
Disconnected from 5E:67:02:D3:1C:DB (random), reason  (0x13)
```

- Parantheses around everything:
```
// strings enabled
Security failed: 5E:67:02:D3:1C:DB (random) level 1 \
err (BT_SECURITY_ERR_PAIR_NOT_ALLOWED(6))
Disconnected from 5E:67:02:D3:1C:DB (random), \
reason (BT_HCI_ERR_REMOTE_USER_TERM_CONN(0x13))
// strings disabled
Security failed: 5E:67:02:D3:1C:DB (random) level 1 err ((6))
Disconnected from 5E:67:02:D3:1C:DB (random), reason ((0x13))
```

- Error code first, then string representation:
```
// strings enabled
Security failed: 5E:67:02:D3:1C:DB (random) level 1 \
err 6 (BT_SECURITY_ERR_PAIR_NOT_ALLOWED)
Disconnected from 5E:67:02:D3:1C:DB (random), reason \
0x13 (BT_HCI_ERR_REMOTE_USER_TERM_CONN)
// strings disabled
Security failed: 5E:67:02:D3:1C:DB (random) level 1 err 6 ()
Disconnected from 5E:67:02:D3:1C:DB (random), reason 0x13 ()
```

- Apostrophes around error printing:
```
// strings enabled
Security failed: 5E:67:02:D3:1C:DB (random) level 1 \
err "BT_SECURITY_ERR_PAIR_NOT_ALLOWED (6)"
Disconnected from 5E:67:02:D3:1C:DB (random), reason \
"BT_HCI_ERR_REMOTE_USER_TERM_CONN (0x13)"
// strings disabled
Security failed: 5E:67:02:D3:1C:DB (random) level 1 err " (6)"
Disconnected from 5E:67:02:D3:1C:DB (random), reason " (0x13)"
```

Signed-off-by: Rubin Gerritsen <rubin.gerritsen@nordicsemi.no>
2024-07-31 12:56:11 +02:00
Emil Gydesen
c6cc034b5c Bluetooth: Audio: Add fallback to get_chan_allocation
Added a fallback parameter to
bt_audio_codec_cfg_get_chan_allocation as absence of
channel allocation in BAP implicitly means Mono.
In the case that it is absent,
BT_AUDIO_LOCATION_MONO_AUDIO is the returned value.

This commit also fixes the implementation of
bt_audio_codec_cfg_get_frame_blocks_per_sdu as it only applies to
LC3 (as per the BAP spec). It also adds additional testing of it

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-06-13 05:41:47 -04:00
Emil Gydesen
6b6107ccd1 Bluetooth: Audio: Rename set_sirk to just sirk
The S in SIRK is for set, so set_sirk was effectively
"set set".

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-05-31 08:05:24 +02:00
Emil Gydesen
04e38ae176 samples: Bluetooth: Fix incorrect comments about adv sets
Several places we simply had
/* Create a non-connectable non-scannable advertising set */
regardless of the type of advertising it was.

Modified the comment to omit the scannable part
and corrected the connectable part.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-05-24 07:46:43 -04:00
Emil Gydesen
353a05b116 Bluetooth: BAP: Unicast server depend on PACS
When in the BAP unicast server role, at least PAC sink
or PAC source shall be set.

In order to fulfill this new requirement, a few other Kconfig
options had to be changed to a `depends on` from `select` to
avoid recursive Kconfig requirements. This change may require
some applications to update their configurations according
to the migration guide.

The change from `select` to `depends on` is ideal anyhow
as that is the recommended way to add dependencies.

This can checked via the combined BT_PACS Kconfig value.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-04-30 14:30:45 -04:00
Théo Battrel
7bc63985af Bluetooth: Samples: Remove uses of auto name in AD
The advertiser options to automatically add the name in the scan
response and the advertising data will be deprecated.

Update the samples that were using those options by explicitly adding
the device name in the advertising data or the scan response data.

Signed-off-by: Théo Battrel <theo.battrel@nordicsemi.no>
2024-04-23 12:42:24 +02:00
Emil Gydesen
3e634268d6 Bluetooth: ISO: Introduce bt_iso_chan_send_ts
The bt_iso_chan_send function could take an optional
timestamp by using 0 as an indicator. The issue with
this approach was that a timestamp value of 0 is valid,
and could cause potential issue with syncing streams
in a group.

To fully support transmitting with and without timestamp,
bt_iso_chan_send_ts has been introduced, which is the only
function of the two (bt_iso_chan_send being the other) that
supports timestamps.

A new function, rather than adding a boolean to the existing,
was chosen as it simplifies the individual functions as well
as making it more explicit what the function does.

Since the bt_iso_chan_send function is used by LE audio, both
the BAP and CAP send functions have similarly been updated.
Likewise, all tests and samples have been updated to use the
updated function(s), and BT_ISO_TIMESTAMP_NONE has been
removed.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-02-12 13:13:10 +01:00
Emil Gydesen
cbc81b2a0f Bluetooth: Audio: Remove LC3 from the assigned numbers defines
The defines from the Bluetooth Audio assigned numbers are not
specific for LC3. This commit removes the LC3 infix and
the reference to LC3 in the documentation for them.

It also cleans up some of the documentation and
names of the enums.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2024-02-05 09:14:44 -06:00
Alberto Escolar Piedras
e444f49540 samples/bluetooth/hap_ha: Enable in native_sim
Enable this test in the native_sim target

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
2023-11-14 09:52:34 +02:00
Emil Gydesen
9c47eb924f Bluetooth: Audio: Refactor codec_cfg_get_frame_duration_us
Refactor the codec_cfg_get_frame_duration function to return the
assigned numbers value, instead of a converted value, but with
support for converting the value.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-10-20 14:56:13 +02:00
Emil Gydesen
f5dd62bbec Bluetooth: Audio: Update codec_cfg_get_chan_allocation
Update the function name from codec_cfg_get_chan_allocation_val
to just codec_cfg_get_chan_allocation, and add
codec_cfg_set_chan_allocation.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-09-29 16:29:58 +02:00
Emil Gydesen
85bb2624bc Bluetooth: Audio: Refactor codec_cfg_get_freq
Refactor the codec_cfg_get_freq function to return the assigned
numbers value, instead of a converted value, but with
support for converting the value.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-09-28 14:05:18 +02:00
Emil Gydesen
2147eefa15 Bluetooth: PACS: Remove CONFIG_BT_PACS_{SNK,SRC}_CONTEXT
The Kconfig option was never used by the stack and should
thus be removed.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-09-22 09:21:53 +02:00
Emil Gydesen
f93caa3903 Bluetooth: Audio: BT_AUDIO_CODEC_LC3_ID -> BT_HCI_CODING_FORMAT_LC3
Replace the BT_AUDIO_CODEC_LC3_ID macro with the
BT_HCI_CODING_FORMAT_LC3 as there is no reason to
define and use the LC3 ID different than the other
allowed codec IDs.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-09-20 20:19:50 +01:00
Emil Gydesen
6ccd112c56 Bluetooth: Audio: Refactor bt_audio_codec_cfg to flat arrays
Refactor the bt_audio_codec_cfg to use flat arrays to store
metadata and codec specific configurations.

The purpose of this is to make it easier to copy the data
between layers, but also to support non-LTV data for non-LC3
codec configurations.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-08-28 15:56:53 +02:00
Mariusz Skamra
2b27b4ebe0 Bluetooth: audio: tbs_client: Subscribe to all required notifications
This removes odd `subscribe` parameter from bt_tbs_client_discover
function parameters list. As the API user enables specific
CONFIG_BT_TBS_CLIENT_* option, the client implementation should
subscribe to the characteristic notifications so that the user receives
the value updates.

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>
2023-08-23 15:44:07 +02:00
Mariusz Skamra
d28f180473 Bluetooth: audio: ascs: Move metadata validation to stack
As the metadata has to be validated anyway, let the initial vaidation of
metadata to be done in ASCS. The application can still reject the
metadata, but the length validation and supported type validation can be
performed by the stack.

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>
2023-08-22 09:59:53 +02:00
Daniel Leung
eedc0bf0fa samples: bluetooth: rename shadow variables
Rename shadow variables found by -Wshadow.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
2023-08-17 13:00:09 +02:00
Emil Gydesen
53502cb417 Bluetooth: Audio: Make codec_cap const
There is no reason why the capabilities
should be modified by the stack after registration,
nor any reason why a the unicast client application
needs to modify the reported remote capabilities, so
all have been marked as const.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-08-15 11:14:29 +00:00
Emil Gydesen
aa990ae6dc Bluetooth: Audio: Refactor bt_audio_codec_cap to flat arrays
Refactor the bt_audio_codec_cap to use flat arrays to store
metadata and codec specific capabilities.

The purpose of this is to make it easier to copy the data
between layers, but also to support non-LTV data for non-LC3
codec capabilities.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-08-15 11:14:29 +00:00
Mariusz Skamra
c09c4181cf Bluetooth: audio: tbs_client: Minor Kconfig refactor
This intoduces dedicated Kconfig option to enable TBS client,
that makes the configuration more intuitive.
While configuring GTBS only, the user does not have to explicitly set
the BT_TBS_CLIENT_MAX_TBS_INSTANCES to 0 to disable the TBS client
functionality.
This adds also `tbs_only_client` test case to test the TBS only build
option.

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>
2023-07-18 11:06:57 +00:00
Emil Gydesen
69f7fd9cb2 Bluetooth: Audio: Rename bt_codec to bt_audio_codec_{cap, conf, data}
Rename the bt_codec struct to bt_audio_codec_conf or
to the new struct bt_audio_codec_cap.
Rename the bt_codec_data to bt_audio_codec_data.

The purpose of this is to split the codec specific configuration
and codec capabilities into seperate structs, as they do not
reflect the same values, or used for the same purpose.

This commit depends on the preset macros workings on either
type of struct (for now), but will be modified in future updates.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-06-30 12:39:50 +02:00
Mariusz Skamra
17223f136f Bluetooth: audio: Fix metadata length checks
This fixes metadata length checks for BT_AUDIO_METADATA_TYPE_EXTENDED
and BT_AUDIO_METADATA_TYPE_VENDOR that should be at least 2 bytes long.

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>
2023-06-29 21:06:58 +02:00
Mariusz Skamra
db5767e50f Bluetooth: audio: Accept empty CCID list in audio metadata
The CCID list can be empty, as the Assigned Numbers is not strict
regarding it's minimum length.

Fixes: #59666
Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>
2023-06-29 21:06:58 +02:00
Théo Battrel
e9ee3e0af0 Bluetooth: Samples: Remove usage of BT_DEBUG_LOG
Remove usage of Kconfig symbol `CONFIG_BT_DEBUG_LOG` from samples. It
has been deprecated since this PR:
https://github.com/zephyrproject-rtos/zephyr/pull/56183

The Kconfig symbols has been replaced by `CONFIG_LOG=y` on most of the
cases. Or it has been removed when not needed anymore.

Signed-off-by: Théo Battrel <theo.battrel@nordicsemi.no>
2023-06-07 13:56:55 -04:00
Mariusz Skamra
21599a6b14 Bluetooth: audio: has: Fix building with preset support disabled
This fixes regression causing compilation errors seen when the
code is built without preset support (BT_HAS_PRESET_COUNT = 0).

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>
2023-06-05 16:24:18 +02:00
Fredrik Danebjer
7457bcf0a2 Bluetooth: Audio: Make HAS optional notify characteristics optional
Added Kconfig options to make HAS characteristics that has notify as
optional property selectable and thus optional. These settings are
global, meaning that a chosen notify property will be used for all
registered has instances.

Signed-off-by: Fredrik Danebjer <frdn@demant.com>
2023-05-26 09:09:06 -04:00
Emil Gydesen
e8ade2356a Bluetooth: BAP: Add unicast client and server write long support
Add support for long writes for the unicast client and server.
This reuses the ATT buffer for long reads.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-05-26 05:55:15 -04:00
Emil Gydesen
5109c941f2 Bluetooth: Audio: Add TBS client TX buffer count requirement
After removing the high default for MCS, it was discovered that
the TBS client requires a significant amount of buffers to work
properly as well. Added the requirement as a build assert that
depends on which optional TBS client features are enabled.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-05-26 05:54:58 -04:00
Emil Gydesen
426bc4545a Bluetooth: Use BT_BYTES_LIST_LEXX macros for encoding of data
Modify the BT_UUID_XX_ENCODE and BT_LE_SUPP_FEAT_XX_ENCODE
macros to use the SYS_ENCODE_LEXX macros, instead of re-inventing
the encoding.

Also apply the macros for several other places.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-05-08 09:56:56 +02:00
Emil Gydesen
2ec1a506a4 Bluetooth: Audio: Fix enum mismatch for codec get chan alloc
The function bt_codec_cfg_get_chan_allocation_val takes a pointer
to an enum, rather than an uint32_t, but was wrongly defined in
the header files and incorrectly used a few places.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
2023-05-05 16:18:07 +02:00
Jonathan Rico
fb10381328 Bluetooth: iso: use kconfig for userdata size
Use BT_CONN_TX_USER_DATA_SIZE when defining pools of buffers that will go
through `bt_conn_send_cb()`.

Signed-off-by: Jonathan Rico <jonathan.rico@nordicsemi.no>
2023-05-03 10:02:44 +02:00
Keith Packard
0b90fd5adf samples, tests, boards: Switch main return type from void to int
As both C and C++ standards require applications running under an OS to
return 'int', adapt that for Zephyr to align with those standard. This also
eliminates errors when building with clang when not using -ffreestanding,
and reduces the need for compiler flags to silence warnings for both clang
and gcc.

Most of these changes were automated using coccinelle with the following
script:

@@
@@
- void
+ int
main(...) {
	...
-	return;
+	return 0;
	...
}

Approximately 40 files had to be edited by hand as coccinelle was unable to
fix them.

Signed-off-by: Keith Packard <keithp@keithp.com>
2023-04-14 07:49:41 +09:00