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Roman Penyaev c9c05ed525 tests/unit/test-char: add unit tests for hub chardev backend 
This commit introduces a new test function `char_hub_test` to validate
the functionality and constraints of the "hub" chardev backend in QEMU.
The test includes multiple scenarios:

1. Invalid hub creation:
   - Creating a hub without defining `chardevs.N` (expects an error).
   - Creating a hub with an embedded multiplexer (`mux=on`) or a chardev
     already in use (expects errors).

2. Max backend limit:
   - Ensures the hub does not accept more backends than the maximum
     allowed, with appropriate error handling.

3. Valid hub creation and data aggregation:
   - Successfully creating a hub with two ring buffer backends.
   - Verifying data aggregation from backends to a frontend and vice versa.
   - Ensuring correct error handling for attempts to attach a hub multiple
     times or remove busy chardevs.

4. Extended EAGAIN simulation (non-Windows only):
   - Simulates a setup with three backends, including a pipe, to test
     EAGAIN handling and watcher behavior.
   - Verifies data flow and recovery in scenarios involving buffer
     overflows and drained pipes.

The test also ensures correct cleanup of chardevs in all cases, covering
both valid and invalid configurations.

Signed-off-by: Roman Penyaev <r.peniaev@gmail.com>
Reviewed-by: "Marc-André Lureau" <marcandre.lureau@redhat.com>
Cc: qemu-devel@nongnu.org
Message-ID: <20250123085327.965501-4-r.peniaev@gmail.com>
2025-02-03 13:57:08 +04:00
..
check-block-qdict.c tests: unit: add NULL-pointer check 2022-09-18 09:17:41 +02:00
check-qdict.c
check-qjson.c tests/: spelling fixes 2023-09-08 13:08:52 +03:00
check-qlist.c
check-qlit.c
check-qnull.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
check-qnum.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
check-qobject.c tests: remove block/qdict checks from check-qobject.c 2022-04-21 17:03:51 +04:00
check-qom-interface.c
check-qom-proplist.c tests: Explicitly create containers in test_qom_partial_path() 2024-12-20 17:44:55 +01:00
check-qstring.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
crypto-tls-psk-helpers.c crypto: Remove 'crypto-tls-x509-helpers.h' from crypto-tls-psk-helpers.c 2024-07-24 10:39:10 +01:00
crypto-tls-psk-helpers.h tests: add migration tests of TLS with PSK credentials 2022-05-16 11:46:04 +01:00
crypto-tls-x509-helpers.c tests/unit/crypto-tls-x509-helpers: deinit privkey in test_tls_cleanup 2024-09-03 16:24:34 -03:00
crypto-tls-x509-helpers.h tests/qtest/migration-test: Free QCRyptoTLSTestCertReq objects 2024-09-03 16:24:34 -03:00
io-channel-helpers.c tests/channel-helper: set blocking in main thread 2022-10-12 19:22:01 +04:00
io-channel-helpers.h
iothread.c async: the main AioContext is only "current" if under the BQL 2021-06-18 10:59:52 -05:00
iothread.h
meson.build tests/unit: remove block layer code from test-nested-aio-poll 2024-10-02 12:58:46 +02:00
pkix_asn1_tab.c.inc crypto: Restrict pkix_asn1_tab[] to crypto-tls-x509-helpers.c 2024-07-24 10:39:10 +01:00
ptimer-test-stubs.c async: Add an optional reentrancy guard to the BH API 2023-04-28 11:31:07 +02:00
ptimer-test.c hw/core/ptimer: fix timer zero period condition for freq > 1GHz 2024-08-12 11:40:16 +01:00
ptimer-test.h
rcutorture.c Updated the FSF address to <https://www.gnu.org/licenses/> 2023-02-27 09:15:39 +01:00
socket-helpers.c tests/unit/socket-helpers: Don't close(-1) 2024-03-25 10:41:00 +00:00
socket-helpers.h tests/unit: Update test-io-channel-socket.c for Windows 2022-09-02 15:54:47 +04:00
test-aio-multithread.c atomics: eliminate mb_read/mb_set 2023-06-06 09:42:14 +02:00
test-aio.c tests: remove aio_context_acquire() tests 2023-12-21 22:49:27 +01:00
test-authz-list.c
test-authz-listfile.c
test-authz-pam.c
test-authz-simple.c
test-base64.c
test-bdrv-drain.c include: Include missing 'qemu/clang-tsa.h' header 2024-12-20 17:44:57 +01:00
test-bdrv-graph-mod.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
test-bitcnt.c
test-bitmap.c
test-bitops.c
test-block-backend.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
test-block-iothread.c include: Include missing 'qemu/clang-tsa.h' header 2024-12-20 17:44:57 +01:00
test-blockjob-txn.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
test-blockjob.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
test-bufferiszero.c
test-char.c tests/unit/test-char: add unit tests for hub chardev backend 2025-02-03 13:57:08 +04:00
test-clone-visitor.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
test-coroutine.c tests/coroutine: Clean up global variable shadowing 2023-10-27 09:39:08 +02:00
test-crypto-afsplit.c qapi/crypto: Rename QCryptoHashAlgorithm to *Algo, and drop prefix 2024-09-10 14:02:16 +02:00
test-crypto-akcipher.c qapi/crypto: Rename QCryptoRSAPaddingAlgorithm to *Algo, and drop prefix 2024-09-10 14:03:30 +02:00
test-crypto-block.c qapi/crypto: Rename QCryptoIVGenAlgorithm to *Algo, and drop prefix 2024-09-10 14:03:30 +02:00
test-crypto-cipher.c qapi/crypto: Rename QCryptoCipherAlgorithm to *Algo, and drop prefix 2024-09-10 14:03:30 +02:00
test-crypto-der.c crypto: Support DER encodings 2022-11-02 06:56:32 -04:00
test-crypto-hash.c crypto: Introduce SM3 hash hmac pbkdf algorithm 2024-11-05 18:37:18 +00:00
test-crypto-hmac.c crypto: Introduce SM3 hash hmac pbkdf algorithm 2024-11-05 18:37:18 +00:00
test-crypto-ivgen.c qapi/crypto: Rename QCryptoIVGenAlgorithm to *Algo, and drop prefix 2024-09-10 14:03:30 +02:00
test-crypto-pbkdf.c crypto: Introduce SM3 hash hmac pbkdf algorithm 2024-11-05 18:37:18 +00:00
test-crypto-secret.c tests/: spelling fixes 2023-09-08 13:08:52 +03:00
test-crypto-tlscredsx509.c tests: Use g_mkdir_with_parents() 2022-08-25 15:24:09 +02:00
test-crypto-tlssession.c crypto: propagate errors from TLS session I/O callbacks 2024-07-24 10:39:10 +01:00
test-crypto-xts.c
test-cutils.c cutils: Improve qemu_strtosz handling of fractions 2023-06-02 12:29:27 -05:00
test-div128.c host-utils: add unit tests for divu128/divs128 2021-10-27 17:10:00 -07:00
test-error-report.c error: add global &error_warn destination 2023-03-13 15:23:37 +04:00
test-fifo.c tests/unit: Comment FIFO8 tests 2024-09-13 20:11:13 +02:00
test-forward-visitor.c include: add qemu/keyval.h 2022-04-21 17:03:51 +04:00
test-hbitmap.c Use g_new() & friends where that makes obvious sense 2022-03-21 15:44:44 +01:00
test-image-locking.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
test-int128.c qemu/int128: add int128_urshift 2022-04-20 18:00:30 -03:00
test-interval-tree.c util: Add interval-tree.c 2022-12-20 17:09:41 -08:00
test-io-channel-buffer.c
test-io-channel-command.c tests: fix path separator, use g_build_filename() 2023-03-13 15:39:31 +04:00
test-io-channel-file.c tests: replace pipe() with g_unix_open_pipe(CLOEXEC) 2022-05-03 15:46:08 +04:00
test-io-channel-null.c io: add a QIOChannelNull equivalent to /dev/null 2022-06-22 18:11:21 +01:00
test-io-channel-socket.c tests/unit: Add a assert for test_io_channel_unix_listen_cleanup 2024-10-10 13:41:45 +01:00
test-io-channel-tls.c Call qemu_socketpair() instead of socketpair() when possible 2023-01-16 17:42:17 +01:00
test-io-task.c tests/unit/test-io-task: Rename "qemu:dummy" to avoid colon in the name 2023-12-20 10:29:23 +01:00
test-iov.c tests/unit/test-iov: Fix timeout problem on NetBSD and OpenBSD 2024-01-23 15:25:45 +01:00
test-keyval.c include: add qemu/keyval.h 2022-04-21 17:03:51 +04:00
test-logging.c util/log: Remove qemu_log_close 2022-04-20 10:51:11 -07:00
test-mul64.c
test-nested-aio-poll.c tests/unit: Remove debug statements in test-nested-aio-poll.c 2024-04-25 15:15:25 +02:00
test-opts-visitor.c
test-qapi-util.c
test-qdev-global-props.c Accel & Exec patch queue 2024-12-21 11:07:00 -05:00
test-qdist.c
test-qemu-opts.c qemu-option: remove now-dead code 2021-07-06 08:33:51 +02:00
test-qga.c tests/unit/test-qga: do not qualify executable paths 2024-01-30 12:11:35 +02:00
test-qgraph.c tests: Remove uses of deprecated raspi2/raspi3 machine names 2021-09-01 11:08:15 +01:00
test-qht.c
test-qmp-cmds.c tests: add G_GNUC_PRINTF for various functions 2023-01-11 10:44:34 +01:00
test-qmp-event.c tests/unit/test-qmp-event: Replace fixture by global variables 2023-12-20 10:29:23 +01:00
test-qobject-input-visitor.c tests/qapi-schema: Drop temporary 'prefix' 2024-09-10 13:22:47 +02:00
test-qobject-output-visitor.c tests/qapi-schema: Drop temporary 'prefix' 2024-09-10 13:22:47 +02:00
test-qtree.c util: import GTree as QTree 2023-03-28 15:23:10 -07:00
test-rcu-list.c replace TABs with spaces 2023-03-20 12:43:50 +01:00
test-rcu-simpleq.c
test-rcu-slist.c
test-rcu-tailq.c
test-replication.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
test-resv-mem.c test-resv-mem: Fix CID 1523911 2023-11-13 11:35:47 +01:00
test-seccomp.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
test-shift128.c
test-smp-parse.c tests/unit/test-smp-parse: Test the full 8-levels topology hierarchy 2024-06-12 12:10:57 +02:00
test-string-input-visitor.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
test-string-output-visitor.c Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
test-thread-pool.c tests: mark more coroutine_fns 2023-04-25 13:17:28 +02:00
test-throttle.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
test-timed-average.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
test-util-filemonitor.c test-util-filemonitor: Adapt to the FreeBSD inotify rename semantics 2024-02-06 10:27:50 +01:00
test-util-sockets.c tests/unit/test-util-sockets: Remove temporary file after test 2024-03-01 08:27:33 +01:00
test-uuid.c util/uuid: Add UUID_STR_LEN definition 2023-11-03 09:20:31 +01:00
test-virtio-dmabuf.c hw/display: introduce virtio-dmabuf 2023-10-04 18:15:06 -04:00
test-visitor-serialization.c qapi tests: Elide redundant has_FOO in generated C 2022-12-13 18:31:37 +01:00
test-vmstate.c migration: remove migration.h references 2024-03-11 16:28:59 -04:00
test-write-threshold.c write-threshold: deal with includes 2021-05-14 16:14:10 +02:00
test-x86-topo.c tests: Add test case of APIC ID for module level parsing 2024-05-22 19:43:29 +02:00
test-xbzrle.c migration/xbzrle: Use i386 host/cpuinfo.h 2023-05-23 16:51:18 -07:00
test-xs-node.c tests/unit: replace assert(0) with g_assert_not_reached() 2024-09-17 10:50:39 +02:00
test-yank.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00