P4: Production hardening — syslog, shutdown fix, output IPC

2026-06-23 13:26:53 -04:00
parent a5423b7f55
commit 5a1d9d39f2
49 changed files with 892 additions and 220 deletions
@@ -0,0 +1,66 @@
+# OPLabs Mixer Daemon — build, install, manage
+#
+# Targets:
+#   build          — Build the daemon binary
+#   test           — Run core tests
+#   install        — Install systemd service
+#   uninstall      — Remove systemd service
+#   restart        — Restart the systemd service
+#   status         — Show service status
+#   start          — Start the service
+#   stop           — Stop the service
+#   logs           — Tail log output
+#   clean          — Clean build artifacts
+
+BUILD_DIR := $(dir $(realpath $(lastword $(MAKEFILE_LIST))))build
+SERVICE := oplabs-mixer-daemon.service
+SERVICE_PATH := /etc/systemd/system/$(SERVICE)
+
+.PHONY: build test install uninstall restart status start stop logs clean
+
+# Build the daemon
+build:
+	@mkdir -p $(BUILD_DIR)
+	@cd $(BUILD_DIR) && cmake .. && make -j$$(nproc)
+	@echo "=== Build complete: $(BUILD_DIR)/mixer-daemon ==="
+
+# Run core tests
+test:
+	@cd $(BUILD_DIR) && ctest --output-on-failure
+
+# Install systemd service and start it
+install: $(BUILD_DIR)/mixer-daemon
+	sudo cp $(SERVICE) $(SERVICE_PATH)
+	sudo systemctl daemon-reload
+	sudo systemctl enable $(SERVICE)
+	sudo systemctl restart $(SERVICE)
+	@echo "=== Service status ==="
+	sudo systemctl status --no-pager $(SERVICE)
+
+# Remove systemd service
+uninstall:
+	sudo systemctl stop $(SERVICE) || true
+	sudo systemctl disable $(SERVICE) || true
+	sudo rm -f $(SERVICE_PATH)
+	sudo systemctl daemon-reload
+	@echo "=== Uninstalled ==="
+
+restart:
+	sudo systemctl restart $(SERVICE)
+	sudo systemctl status --no-pager $(SERVICE)
+
+status:
+	sudo systemctl status --no-pager $(SERVICE)
+
+start:
+	sudo systemctl start $(SERVICE)
+
+stop:
+	sudo systemctl stop $(SERVICE)
+
+logs:
+	sudo journalctl -u $(SERVICE) -n 100 -f
+
+clean:
+	rm -rf $(BUILD_DIR)
+	@echo "=== Cleaned ==="
@@ -22,7 +22,7 @@ CMAKE_AR:FILEPATH=/usr/bin/ar

 //Choose the type of build, options are: None Debug Release RelWithDebInfo
 // MinSizeRel ...
-CMAKE_BUILD_TYPE:STRING=
+CMAKE_BUILD_TYPE:STRING=Release

 //Enable/Disable color output during build.
 CMAKE_COLOR_MAKEFILE:BOOL=ON
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+ /usr/include/x86_64-linux-gnu/bits/select-decl.h
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+ /usr/include/x86_64-linux-gnu/bits/select2.h
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+ /usr/include/x86_64-linux-gnu/bits/stdio.h
+ /usr/include/x86_64-linux-gnu/bits/stdio2-decl.h
+ /usr/include/x86_64-linux-gnu/bits/stdio2.h
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+ /usr/include/x86_64-linux-gnu/bits/stdlib-bsearch.h
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+ /usr/include/x86_64-linux-gnu/bits/stdlib.h
+ /usr/include/x86_64-linux-gnu/bits/string_fortified.h
+ /usr/include/x86_64-linux-gnu/bits/strings_fortified.h
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@@ -224,6 +233,8 @@ CMakeFiles/mixer-control.dir/src/MixerBus.cpp.o
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+ /usr/include/x86_64-linux-gnu/bits/wchar2-decl.h
+ /usr/include/x86_64-linux-gnu/bits/wchar2.h
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@@ -422,13 +433,22 @@ CMakeFiles/mixer-control.dir/src/MixerChannelStrip.cpp.o
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+ /usr/include/x86_64-linux-gnu/bits/select-decl.h
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+ /usr/include/x86_64-linux-gnu/bits/select2.h
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+ /usr/include/x86_64-linux-gnu/bits/stdio.h
+ /usr/include/x86_64-linux-gnu/bits/stdio2-decl.h
+ /usr/include/x86_64-linux-gnu/bits/stdio2.h
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+ /usr/include/x86_64-linux-gnu/bits/stdlib-bsearch.h
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+ /usr/include/x86_64-linux-gnu/bits/stdlib.h
+ /usr/include/x86_64-linux-gnu/bits/string_fortified.h
+ /usr/include/x86_64-linux-gnu/bits/strings_fortified.h
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+ /usr/include/x86_64-linux-gnu/bits/wchar2-decl.h
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+ /usr/include/x86_64-linux-gnu/bits/select-decl.h
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+ /usr/include/x86_64-linux-gnu/bits/socket2.h
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+ /usr/include/x86_64-linux-gnu/bits/select-decl.h
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+ /usr/include/x86_64-linux-gnu/bits/stdio.h
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+ /usr/include/x86_64-linux-gnu/bits/wchar2-decl.h
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+  /usr/include/x86_64-linux-gnu/bits/select-decl.h \
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+  /usr/include/x86_64-linux-gnu/bits/wchar2-decl.h \
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+  /usr/include/x86_64-linux-gnu/bits/select-decl.h \
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@@ -1211,6 +1258,8 @@ CMakeFiles/mixer-control.dir/src/MixerEngine.cpp.o: /home/oplabs/projects/oplabs

 /usr/include/c++/15/functional:

+/usr/include/x86_64-linux-gnu/bits/unistd-decl.h:
+
 /usr/include/c++/15/ctime:

 /usr/include/c++/15/cassert:
@@ -1251,6 +1300,8 @@ CMakeFiles/mixer-control.dir/src/MixerEngine.cpp.o: /home/oplabs/projects/oplabs

 /usr/include/c++/15/bits/fs_path.h:

+/usr/include/x86_64-linux-gnu/bits/unistd.h:
+
 /usr/include/c++/15/bits/fs_ops.h:

 /usr/include/c++/15/bits/stl_tree.h:
@@ -1327,6 +1378,22 @@ _deps/nlohmann_json-src/include/nlohmann/detail/iterators/iter_impl.hpp:

 _deps/nlohmann_json-src/include/nlohmann/detail/iterators/internal_iterator.hpp:

+_deps/nlohmann_json-src/include/nlohmann/detail/input/position_t.hpp:
+
+_deps/nlohmann_json-src/include/nlohmann/detail/input/parser.hpp:
+
+_deps/nlohmann_json-src/include/nlohmann/detail/input/input_adapters.hpp:
+
+_deps/nlohmann_json-src/include/nlohmann/detail/input/binary_reader.hpp:
+
+_deps/nlohmann_json-src/include/nlohmann/detail/exceptions.hpp:
+
+_deps/nlohmann_json-src/include/nlohmann/detail/conversions/to_chars.hpp:
+
+/usr/include/c++/15/forward_list:
+
+_deps/nlohmann_json-src/include/nlohmann/detail/conversions/from_json.hpp:
+
 /usr/include/c++/15/vector:

 /usr/include/c++/15/memory:
@@ -1369,6 +1436,8 @@ _deps/nlohmann_json-src/include/nlohmann/detail/output/serializer.hpp:

 /usr/include/linux/types.h:

+/usr/include/x86_64-linux-gnu/bits/select2.h:
+
 /usr/include/c++/15/exception:

 /usr/include/c++/15/cwchar:
@@ -1421,8 +1490,6 @@ _deps/nlohmann_json-src/include/nlohmann/detail/output/output_adapters.hpp:

 /usr/include/c++/15/bits/utility.h:

-/usr/include/c++/15/bits/version.h:
-
 /usr/include/c++/15/bits/concept_check.h:

 /usr/include/c++/15/bits/uses_allocator.h:
@@ -1443,6 +1510,8 @@ _deps/nlohmann_json-src/include/nlohmann/detail/output/output_adapters.hpp:

 /usr/include/x86_64-linux-gnu/asm/errno.h:

+/usr/include/x86_64-linux-gnu/bits/stdlib.h:
+
 /usr/include/c++/15/numeric:

 /usr/include/x86_64-linux-gnu/bits/types/struct_timeval.h:
@@ -1489,6 +1558,10 @@ _deps/nlohmann_json-src/include/nlohmann/detail/meta/std_fs.hpp:

 /usr/include/x86_64-linux-gnu/bits/long-double.h:

+_deps/nlohmann_json-src/include/nlohmann/detail/input/json_sax.hpp:
+
+/usr/include/c++/15/pstl/pstl_config.h:
+
 /usr/include/c++/15/tr1/special_function_util.h:

 /usr/include/x86_64-linux-gnu/bits/thread-shared-types.h:
@@ -1619,14 +1692,12 @@ _deps/nlohmann_json-src/include/nlohmann/json_fwd.hpp:

 /usr/include/c++/15/bits/memory_resource.h:

-/usr/include/c++/15/bits/atomic_lockfree_defines.h:
-
 /usr/include/x86_64-linux-gnu/bits/waitstatus.h:

-/usr/include/x86_64-linux-gnu/bits/types/error_t.h:
-
 _deps/nlohmann_json-src/include/nlohmann/detail/input/lexer.hpp:

+/usr/include/x86_64-linux-gnu/bits/types/error_t.h:
+
 /usr/include/c++/15/bits/stl_vector.h:

 /usr/include/c++/15/bits/functexcept.h:
@@ -1647,8 +1718,6 @@ _deps/nlohmann_json-src/include/nlohmann/detail/input/lexer.hpp:

 /usr/include/c++/15/tuple:

-_deps/nlohmann_json-src/include/nlohmann/detail/input/position_t.hpp:
-
 /usr/include/c++/15/bits/shared_ptr_atomic.h:

 /usr/include/c++/15/compare:
@@ -1667,6 +1736,12 @@ _deps/nlohmann_json-src/include/nlohmann/detail/input/position_t.hpp:

 /usr/include/x86_64-linux-gnu/bits/errno.h:

+_deps/nlohmann_json-src/include/nlohmann/detail/hash.hpp:
+
+/usr/include/x86_64-linux-gnu/bits/stdio.h:
+
+/usr/include/c++/15/bits/postypes.h:
+
 /usr/include/x86_64-linux-gnu/asm/posix_types.h:

 /usr/include/c++/15/bits/exception_defines.h:
@@ -1681,8 +1756,6 @@ _deps/nlohmann_json-src/include/nlohmann/detail/input/position_t.hpp:

 _deps/nlohmann_json-src/include/nlohmann/byte_container_with_subtype.hpp:

-_deps/nlohmann_json-src/include/nlohmann/detail/input/input_adapters.hpp:
-
 /usr/include/x86_64-linux-gnu/bits/types/sigset_t.h:

 /usr/include/asm-generic/types.h:
@@ -1695,16 +1768,8 @@ _deps/nlohmann_json-src/include/nlohmann/detail/input/input_adapters.hpp:

 /usr/include/errno.h:

-/usr/include/c++/15/pstl/pstl_config.h:
-
-_deps/nlohmann_json-src/include/nlohmann/detail/input/json_sax.hpp:
-
 /usr/include/features.h:

-/usr/include/c++/15/bits/forward_list.h:
-
-/usr/include/linux/posix_types.h:
-
 /usr/include/x86_64-linux-gnu/bits/flt-eval-method.h:

 /usr/include/c++/15/limits:
@@ -1717,10 +1782,6 @@ _deps/nlohmann_json-src/include/nlohmann/detail/input/json_sax.hpp:

 /usr/include/linux/sched/types.h:

-/usr/include/c++/15/forward_list:
-
-_deps/nlohmann_json-src/include/nlohmann/detail/conversions/from_json.hpp:
-
 /usr/include/c++/15/bits/stl_map.h:

 /usr/include/c++/15/bits/locale_classes.h:
@@ -1769,6 +1830,14 @@ _deps/nlohmann_json-src/include/nlohmann/adl_serializer.hpp:

 /usr/include/x86_64-linux-gnu/bits/byteswap.h:

+/usr/include/c++/15/bits/this_thread_sleep.h:
+
+_deps/nlohmann_json-src/include/nlohmann/detail/conversions/to_json.hpp:
+
+/usr/include/x86_64-linux-gnu/asm/posix_types_64.h:
+
+/usr/include/x86_64-linux-gnu/bits/cpu-set.h:
+
 /usr/include/c++/15/bits/unordered_map.h:

 /usr/include/x86_64-linux-gnu/bits/endian.h:
@@ -1791,14 +1860,8 @@ _deps/nlohmann_json-src/include/nlohmann/detail/json_custom_base_class.hpp:

 /usr/include/x86_64-linux-gnu/bits/fp-fast.h:

-_deps/nlohmann_json-src/include/nlohmann/detail/conversions/to_chars.hpp:
-
-/usr/include/x86_64-linux-gnu/bits/fp-logb.h:
-
 /usr/include/x86_64-linux-gnu/bits/libc-header-start.h:

-_deps/nlohmann_json-src/include/nlohmann/detail/input/parser.hpp:
-
 /usr/include/c++/15/bits/basic_ios.h:

 /usr/include/x86_64-linux-gnu/bits/locale.h:
@@ -1821,6 +1884,10 @@ _deps/nlohmann_json-src/include/nlohmann/detail/input/parser.hpp:

 /usr/include/x86_64-linux-gnu/bits/sched.h:

+/usr/include/c++/15/bits/atomic_lockfree_defines.h:
+
+/usr/include/x86_64-linux-gnu/bits/select-decl.h:
+
 /usr/include/x86_64-linux-gnu/bits/getopt_posix.h:

 /usr/include/time.h:
@@ -1833,6 +1900,8 @@ _deps/nlohmann_json-src/include/nlohmann/detail/input/parser.hpp:

 /usr/include/x86_64-linux-gnu/bits/stdint-least.h:

+/usr/include/x86_64-linux-gnu/bits/strings_fortified.h:
+
 /usr/include/x86_64-linux-gnu/bits/types/mbstate_t.h:

 /usr/include/x86_64-linux-gnu/bits/types/struct_timespec.h:
@@ -1845,6 +1914,14 @@ _deps/nlohmann_json-src/include/nlohmann/detail/input/parser.hpp:

 /usr/include/x86_64-linux-gnu/sys/select.h:

+/usr/include/c++/15/bits/forward_list.h:
+
+/usr/include/linux/posix_types.h:
+
+/usr/include/x86_64-linux-gnu/bits/stdio2-decl.h:
+
+/usr/include/x86_64-linux-gnu/bits/stdio2.h:
+
 /usr/include/x86_64-linux-gnu/bits/timex.h:

 /usr/include/x86_64-linux-gnu/bits/stdio_lim.h:
@@ -1857,6 +1934,8 @@ _deps/nlohmann_json-src/include/nlohmann/detail/input/parser.hpp:

 /usr/include/x86_64-linux-gnu/c++/15/bits/os_defines.h:

+/usr/include/x86_64-linux-gnu/bits/string_fortified.h:
+
 /usr/include/c++/15/tr1/poly_hermite.tcc:

 /usr/include/x86_64-linux-gnu/bits/struct_mutex.h:
@@ -1893,6 +1972,8 @@ _deps/nlohmann_json-src/include/nlohmann/detail/meta/type_traits.hpp:

 /usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h:

+/usr/include/x86_64-linux-gnu/bits/stdlib-bsearch.h:
+
 /usr/include/x86_64-linux-gnu/bits/types/clockid_t.h:

 /usr/include/x86_64-linux-gnu/bits/types/struct___jmp_buf_tag.h:
@@ -1907,6 +1988,14 @@ _deps/nlohmann_json-src/include/nlohmann/detail/meta/type_traits.hpp:

 /usr/include/x86_64-linux-gnu/bits/waitflags.h:

+/usr/include/c++/15/bits/version.h:
+
+/usr/include/x86_64-linux-gnu/bits/wchar2-decl.h:
+
+/usr/include/x86_64-linux-gnu/bits/fp-logb.h:
+
+/usr/include/x86_64-linux-gnu/bits/wchar2.h:
+
 /usr/include/c++/15/bits/locale_facets_nonio.h:

 /usr/include/x86_64-linux-gnu/c++/15/bits/atomic_word.h:
@@ -1933,24 +2022,8 @@ _deps/nlohmann_json-src/include/nlohmann/detail/meta/type_traits.hpp:

 /usr/lib/gcc/x86_64-linux-gnu/15/include/stdarg.h:

-/usr/include/c++/15/bits/postypes.h:
-
-_deps/nlohmann_json-src/include/nlohmann/detail/hash.hpp:
-
 /usr/include/c++/15/ext/alloc_traits.h:

 /home/oplabs/projects/oplabs-mixer-daemon/src/MixerChannelStrip.cpp:

 /home/oplabs/projects/oplabs-mixer-daemon/src/MixerControlServer.cpp:
-
-/usr/include/c++/15/bits/this_thread_sleep.h:
-
-/usr/include/x86_64-linux-gnu/asm/posix_types_64.h:
-
-/usr/include/x86_64-linux-gnu/bits/cpu-set.h:
-
-_deps/nlohmann_json-src/include/nlohmann/detail/conversions/to_json.hpp:
-
-_deps/nlohmann_json-src/include/nlohmann/detail/exceptions.hpp:
-
-_deps/nlohmann_json-src/include/nlohmann/detail/input/binary_reader.hpp:
@@ -6,5 +6,5 @@ CXX_DEFINES =

 CXX_INCLUDES = -I/home/oplabs/projects/oplabs-mixer-daemon/include -I/home/oplabs/projects/oplabs-mixer-daemon/build/_deps/nlohmann_json-src/include

-CXX_FLAGS = -std=gnu++17 -fPIC -Wall -Wextra -Wpedantic
+CXX_FLAGS = -O3 -DNDEBUG -std=gnu++17 -fPIC -Wall -Wextra -Wpedantic

@@ -32,6 +32,8 @@ CMakeFiles/mixer-control.dir/src/MixerBus.cpp.o: \
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 /usr/include/x86_64-linux-gnu/bits/types/locale_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__locale_t.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2.h \
 /usr/include/c++/15/type_traits /usr/include/c++/15/bits/version.h \
 /usr/include/c++/15/bits/allocator.h \
 /usr/include/x86_64-linux-gnu/c++/15/bits/c++allocator.h \
@@ -95,22 +97,28 @@ CMakeFiles/mixer-control.dir/src/MixerBus.cpp.o: \
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 /usr/include/x86_64-linux-gnu/bits/types/struct_timeval.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_timespec.h \
+ /usr/include/x86_64-linux-gnu/bits/select2.h \
+ /usr/include/x86_64-linux-gnu/bits/select-decl.h \
 /usr/include/x86_64-linux-gnu/bits/pthreadtypes.h \
 /usr/include/x86_64-linux-gnu/bits/thread-shared-types.h \
 /usr/include/x86_64-linux-gnu/bits/pthreadtypes-arch.h \
 /usr/include/x86_64-linux-gnu/bits/atomic_wide_counter.h \
 /usr/include/x86_64-linux-gnu/bits/struct_mutex.h \
 /usr/include/x86_64-linux-gnu/bits/struct_rwlock.h /usr/include/alloca.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib-bsearch.h \
 /usr/include/x86_64-linux-gnu/bits/stdlib-float.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib.h \
 /usr/include/c++/15/bits/std_abs.h /usr/include/c++/15/cstdio \
 /usr/include/stdio.h /usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h \
 /usr/include/x86_64-linux-gnu/bits/types/cookie_io_functions_t.h \
 /usr/include/x86_64-linux-gnu/bits/stdio_lim.h \
- /usr/include/c++/15/cerrno /usr/include/errno.h \
- /usr/include/x86_64-linux-gnu/bits/errno.h /usr/include/linux/errno.h \
- /usr/include/x86_64-linux-gnu/asm/errno.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2.h /usr/include/c++/15/cerrno \
+ /usr/include/errno.h /usr/include/x86_64-linux-gnu/bits/errno.h \
+ /usr/include/linux/errno.h /usr/include/x86_64-linux-gnu/asm/errno.h \
 /usr/include/asm-generic/errno.h /usr/include/asm-generic/errno-base.h \
 /usr/include/x86_64-linux-gnu/bits/types/error_t.h \
 /usr/include/c++/15/bits/charconv.h \
@@ -198,4 +206,6 @@ CMakeFiles/mixer-control.dir/src/MixerBus.cpp.o: \
 /usr/include/c++/15/bits/stl_heap.h \
 /usr/include/c++/15/bits/uniform_int_dist.h \
 /usr/include/c++/15/pstl/glue_algorithm_defs.h \
- /usr/include/c++/15/cstring /usr/include/string.h /usr/include/strings.h
+ /usr/include/c++/15/cstring /usr/include/string.h /usr/include/strings.h \
+ /usr/include/x86_64-linux-gnu/bits/strings_fortified.h \
+ /usr/include/x86_64-linux-gnu/bits/string_fortified.h
@@ -65,6 +65,8 @@ CMakeFiles/mixer-control.dir/src/MixerChannelStrip.cpp.o: \
 /usr/include/x86_64-linux-gnu/bits/types/FILE.h \
 /usr/include/x86_64-linux-gnu/bits/types/locale_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__locale_t.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2.h \
 /usr/include/c++/15/bits/shared_ptr_base.h /usr/include/c++/15/typeinfo \
 /usr/include/c++/15/bits/allocated_ptr.h \
 /usr/include/c++/15/bits/refwrap.h \
@@ -152,16 +154,22 @@ CMakeFiles/mixer-control.dir/src/MixerChannelStrip.cpp.o: \
 /usr/include/x86_64-linux-gnu/sys/select.h \
 /usr/include/x86_64-linux-gnu/bits/select.h \
 /usr/include/x86_64-linux-gnu/bits/types/sigset_t.h \
- /usr/include/alloca.h /usr/include/x86_64-linux-gnu/bits/stdlib-float.h \
+ /usr/include/x86_64-linux-gnu/bits/select2.h \
+ /usr/include/x86_64-linux-gnu/bits/select-decl.h /usr/include/alloca.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib-bsearch.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib-float.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib.h \
 /usr/include/c++/15/bits/std_abs.h /usr/include/c++/15/cstdio \
 /usr/include/stdio.h /usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h \
 /usr/include/x86_64-linux-gnu/bits/types/cookie_io_functions_t.h \
 /usr/include/x86_64-linux-gnu/bits/stdio_lim.h \
- /usr/include/c++/15/cerrno /usr/include/errno.h \
- /usr/include/x86_64-linux-gnu/bits/errno.h /usr/include/linux/errno.h \
- /usr/include/x86_64-linux-gnu/asm/errno.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2.h /usr/include/c++/15/cerrno \
+ /usr/include/errno.h /usr/include/x86_64-linux-gnu/bits/errno.h \
+ /usr/include/linux/errno.h /usr/include/x86_64-linux-gnu/asm/errno.h \
 /usr/include/asm-generic/errno.h /usr/include/asm-generic/errno-base.h \
 /usr/include/x86_64-linux-gnu/bits/types/error_t.h \
 /usr/include/c++/15/bits/charconv.h \
@@ -195,4 +203,6 @@ CMakeFiles/mixer-control.dir/src/MixerChannelStrip.cpp.o: \
 /usr/include/c++/15/tr1/poly_hermite.tcc \
 /usr/include/c++/15/tr1/poly_laguerre.tcc \
 /usr/include/c++/15/tr1/riemann_zeta.tcc /usr/include/c++/15/cstring \
- /usr/include/string.h /usr/include/strings.h
+ /usr/include/string.h /usr/include/strings.h \
+ /usr/include/x86_64-linux-gnu/bits/strings_fortified.h \
+ /usr/include/x86_64-linux-gnu/bits/string_fortified.h
@@ -32,6 +32,8 @@ CMakeFiles/mixer-control.dir/src/MixerControlServer.cpp.o: \
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 /usr/include/x86_64-linux-gnu/bits/types/locale_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__locale_t.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2.h \
 /usr/include/c++/15/type_traits /usr/include/c++/15/bits/version.h \
 /usr/include/c++/15/bits/allocator.h \
 /usr/include/x86_64-linux-gnu/c++/15/bits/c++allocator.h \
@@ -95,22 +97,28 @@ CMakeFiles/mixer-control.dir/src/MixerControlServer.cpp.o: \
 /usr/include/x86_64-linux-gnu/bits/types/__sigset_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_timeval.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_timespec.h \
+ /usr/include/x86_64-linux-gnu/bits/select2.h \
+ /usr/include/x86_64-linux-gnu/bits/select-decl.h \
 /usr/include/x86_64-linux-gnu/bits/pthreadtypes.h \
 /usr/include/x86_64-linux-gnu/bits/thread-shared-types.h \
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 /usr/include/x86_64-linux-gnu/bits/struct_mutex.h \
 /usr/include/x86_64-linux-gnu/bits/struct_rwlock.h /usr/include/alloca.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib-bsearch.h \
 /usr/include/x86_64-linux-gnu/bits/stdlib-float.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib.h \
 /usr/include/c++/15/bits/std_abs.h /usr/include/c++/15/cstdio \
 /usr/include/stdio.h /usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h \
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 /usr/include/x86_64-linux-gnu/bits/types/cookie_io_functions_t.h \
 /usr/include/x86_64-linux-gnu/bits/stdio_lim.h \
- /usr/include/c++/15/cerrno /usr/include/errno.h \
- /usr/include/x86_64-linux-gnu/bits/errno.h /usr/include/linux/errno.h \
- /usr/include/x86_64-linux-gnu/asm/errno.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2.h /usr/include/c++/15/cerrno \
+ /usr/include/errno.h /usr/include/x86_64-linux-gnu/bits/errno.h \
+ /usr/include/linux/errno.h /usr/include/x86_64-linux-gnu/asm/errno.h \
 /usr/include/asm-generic/errno.h /usr/include/asm-generic/errno-base.h \
 /usr/include/x86_64-linux-gnu/bits/types/error_t.h \
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@@ -199,8 +207,12 @@ CMakeFiles/mixer-control.dir/src/MixerControlServer.cpp.o: \
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 /usr/include/asm-generic/sockios.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_osockaddr.h \
+ /usr/include/x86_64-linux-gnu/bits/socket2.h \
 /usr/include/x86_64-linux-gnu/sys/un.h /usr/include/string.h \
- /usr/include/strings.h /usr/include/x86_64-linux-gnu/sys/stat.h \
+ /usr/include/strings.h \
+ /usr/include/x86_64-linux-gnu/bits/strings_fortified.h \
+ /usr/include/x86_64-linux-gnu/bits/string_fortified.h \
+ /usr/include/x86_64-linux-gnu/sys/stat.h \
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- /usr/include/alloca.h /usr/include/x86_64-linux-gnu/bits/stdlib-float.h \
+ /usr/include/x86_64-linux-gnu/bits/select2.h \
+ /usr/include/x86_64-linux-gnu/bits/select-decl.h /usr/include/alloca.h \
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- /usr/include/x86_64-linux-gnu/bits/errno.h /usr/include/linux/errno.h \
- /usr/include/x86_64-linux-gnu/asm/errno.h \
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+ /usr/include/x86_64-linux-gnu/bits/stdio.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2.h /usr/include/c++/15/cerrno \
+ /usr/include/errno.h /usr/include/x86_64-linux-gnu/bits/errno.h \
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+ /usr/include/x86_64-linux-gnu/bits/select-decl.h
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+ /usr/include/x86_64-linux-gnu/bits/stdlib.h
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+ /usr/include/x86_64-linux-gnu/bits/syslog-decl.h
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-CXX_FLAGS = -std=gnu++17 -fPIE -Wall -Wextra -Wpedantic
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+/usr/include/c++/15/bits/atomic_lockfree_defines.h:
+
+/usr/include/x86_64-linux-gnu/bits/select-decl.h:
+
 /usr/include/time.h:

 /usr/include/x86_64-linux-gnu/bits/setjmp.h:
@@ -1153,6 +1196,8 @@ CMakeFiles/mixer.dir/src/MixerEngine.cpp.o: /home/oplabs/projects/oplabs-mixer-d

 /usr/include/x86_64-linux-gnu/bits/stdint-least.h:

+/usr/include/x86_64-linux-gnu/bits/strings_fortified.h:
+
 /usr/include/x86_64-linux-gnu/bits/types/mbstate_t.h:

 /usr/include/x86_64-linux-gnu/bits/types/struct_timespec.h:
@@ -1161,6 +1206,12 @@ CMakeFiles/mixer.dir/src/MixerEngine.cpp.o: /home/oplabs/projects/oplabs-mixer-d

 /usr/include/x86_64-linux-gnu/sys/select.h:

+/usr/include/linux/posix_types.h:
+
+/usr/include/x86_64-linux-gnu/bits/stdio2-decl.h:
+
+/usr/include/x86_64-linux-gnu/bits/stdio2.h:
+
 /usr/include/x86_64-linux-gnu/bits/timex.h:

 /usr/include/x86_64-linux-gnu/bits/stdio_lim.h:
@@ -1171,6 +1222,8 @@ CMakeFiles/mixer.dir/src/MixerEngine.cpp.o: /home/oplabs/projects/oplabs-mixer-d

 /usr/include/x86_64-linux-gnu/c++/15/bits/os_defines.h:

+/usr/include/x86_64-linux-gnu/bits/string_fortified.h:
+
 /usr/include/c++/15/tr1/poly_hermite.tcc:

 /usr/include/x86_64-linux-gnu/bits/struct_mutex.h:
@@ -1201,6 +1254,8 @@ CMakeFiles/mixer.dir/src/MixerEngine.cpp.o: /home/oplabs/projects/oplabs-mixer-d

 /usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h:

+/usr/include/x86_64-linux-gnu/bits/stdlib-bsearch.h:
+
 /usr/include/x86_64-linux-gnu/bits/types/clockid_t.h:

 /usr/include/x86_64-linux-gnu/bits/types/struct___jmp_buf_tag.h:
@@ -1215,6 +1270,14 @@ CMakeFiles/mixer.dir/src/MixerEngine.cpp.o: /home/oplabs/projects/oplabs-mixer-d

 /usr/include/x86_64-linux-gnu/bits/waitflags.h:

+/usr/include/c++/15/bits/version.h:
+
+/usr/include/x86_64-linux-gnu/bits/wchar2-decl.h:
+
+/usr/include/x86_64-linux-gnu/bits/fp-logb.h:
+
+/usr/include/x86_64-linux-gnu/bits/wchar2.h:
+
 /usr/include/x86_64-linux-gnu/c++/15/bits/atomic_word.h:

 /usr/include/x86_64-linux-gnu/c++/15/bits/c++allocator.h:
@@ -1223,8 +1286,6 @@ CMakeFiles/mixer.dir/src/MixerEngine.cpp.o: /home/oplabs/projects/oplabs-mixer-d

 /usr/include/x86_64-linux-gnu/c++/15/bits/c++config.h:

-/usr/include/c++/15/bits/hashtable.h:
-
 /usr/include/c++/15/pstl/glue_memory_defs.h:

 /usr/include/x86_64-linux-gnu/c++/15/bits/c++locale.h:
@@ -1248,11 +1309,3 @@ CMakeFiles/mixer.dir/src/MixerEngine.cpp.o: /home/oplabs/projects/oplabs-mixer-d
 /home/oplabs/projects/oplabs-mixer-daemon/src/MixerEngine.cpp:

 /home/oplabs/projects/oplabs-mixer-daemon/include/mixer/MixerEngine.hpp:
-
-/usr/include/linux/stddef.h:
-
-/usr/include/c++/15/bits/stl_map.h:
-
-/usr/include/x86_64-linux-gnu/bits/endian.h:
-
-/usr/include/c++/15/bits/unordered_map.h:
@@ -6,5 +6,5 @@ CXX_DEFINES =

 CXX_INCLUDES = -I/home/oplabs/projects/oplabs-mixer-daemon/include -I/home/oplabs/projects/oplabs-mixer-daemon/build/_deps/nlohmann_json-src/include

-CXX_FLAGS = -std=gnu++17 -fPIC -Wall -Wextra -Wpedantic
+CXX_FLAGS = -O3 -DNDEBUG -std=gnu++17 -fPIC -Wall -Wextra -Wpedantic

@@ -32,6 +32,8 @@ CMakeFiles/mixer.dir/src/MixerBus.cpp.o: \
 /usr/include/x86_64-linux-gnu/bits/types/FILE.h \
 /usr/include/x86_64-linux-gnu/bits/types/locale_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__locale_t.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2.h \
 /usr/include/c++/15/type_traits /usr/include/c++/15/bits/version.h \
 /usr/include/c++/15/bits/allocator.h \
 /usr/include/x86_64-linux-gnu/c++/15/bits/c++allocator.h \
@@ -95,22 +97,28 @@ CMakeFiles/mixer.dir/src/MixerBus.cpp.o: \
 /usr/include/x86_64-linux-gnu/bits/types/__sigset_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_timeval.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_timespec.h \
+ /usr/include/x86_64-linux-gnu/bits/select2.h \
+ /usr/include/x86_64-linux-gnu/bits/select-decl.h \
 /usr/include/x86_64-linux-gnu/bits/pthreadtypes.h \
 /usr/include/x86_64-linux-gnu/bits/thread-shared-types.h \
 /usr/include/x86_64-linux-gnu/bits/pthreadtypes-arch.h \
 /usr/include/x86_64-linux-gnu/bits/atomic_wide_counter.h \
 /usr/include/x86_64-linux-gnu/bits/struct_mutex.h \
 /usr/include/x86_64-linux-gnu/bits/struct_rwlock.h /usr/include/alloca.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib-bsearch.h \
 /usr/include/x86_64-linux-gnu/bits/stdlib-float.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib.h \
 /usr/include/c++/15/bits/std_abs.h /usr/include/c++/15/cstdio \
 /usr/include/stdio.h /usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h \
 /usr/include/x86_64-linux-gnu/bits/types/cookie_io_functions_t.h \
 /usr/include/x86_64-linux-gnu/bits/stdio_lim.h \
- /usr/include/c++/15/cerrno /usr/include/errno.h \
- /usr/include/x86_64-linux-gnu/bits/errno.h /usr/include/linux/errno.h \
- /usr/include/x86_64-linux-gnu/asm/errno.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2.h /usr/include/c++/15/cerrno \
+ /usr/include/errno.h /usr/include/x86_64-linux-gnu/bits/errno.h \
+ /usr/include/linux/errno.h /usr/include/x86_64-linux-gnu/asm/errno.h \
 /usr/include/asm-generic/errno.h /usr/include/asm-generic/errno-base.h \
 /usr/include/x86_64-linux-gnu/bits/types/error_t.h \
 /usr/include/c++/15/bits/charconv.h \
@@ -198,4 +206,6 @@ CMakeFiles/mixer.dir/src/MixerBus.cpp.o: \
 /usr/include/c++/15/bits/stl_heap.h \
 /usr/include/c++/15/bits/uniform_int_dist.h \
 /usr/include/c++/15/pstl/glue_algorithm_defs.h \
- /usr/include/c++/15/cstring /usr/include/string.h /usr/include/strings.h
+ /usr/include/c++/15/cstring /usr/include/string.h /usr/include/strings.h \
+ /usr/include/x86_64-linux-gnu/bits/strings_fortified.h \
+ /usr/include/x86_64-linux-gnu/bits/string_fortified.h
@@ -65,6 +65,8 @@ CMakeFiles/mixer.dir/src/MixerChannelStrip.cpp.o: \
 /usr/include/x86_64-linux-gnu/bits/types/FILE.h \
 /usr/include/x86_64-linux-gnu/bits/types/locale_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__locale_t.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2.h \
 /usr/include/c++/15/bits/shared_ptr_base.h /usr/include/c++/15/typeinfo \
 /usr/include/c++/15/bits/allocated_ptr.h \
 /usr/include/c++/15/bits/refwrap.h \
@@ -152,16 +154,22 @@ CMakeFiles/mixer.dir/src/MixerChannelStrip.cpp.o: \
 /usr/include/x86_64-linux-gnu/sys/select.h \
 /usr/include/x86_64-linux-gnu/bits/select.h \
 /usr/include/x86_64-linux-gnu/bits/types/sigset_t.h \
- /usr/include/alloca.h /usr/include/x86_64-linux-gnu/bits/stdlib-float.h \
+ /usr/include/x86_64-linux-gnu/bits/select2.h \
+ /usr/include/x86_64-linux-gnu/bits/select-decl.h /usr/include/alloca.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib-bsearch.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib-float.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib.h \
 /usr/include/c++/15/bits/std_abs.h /usr/include/c++/15/cstdio \
 /usr/include/stdio.h /usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h \
 /usr/include/x86_64-linux-gnu/bits/types/cookie_io_functions_t.h \
 /usr/include/x86_64-linux-gnu/bits/stdio_lim.h \
- /usr/include/c++/15/cerrno /usr/include/errno.h \
- /usr/include/x86_64-linux-gnu/bits/errno.h /usr/include/linux/errno.h \
- /usr/include/x86_64-linux-gnu/asm/errno.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2.h /usr/include/c++/15/cerrno \
+ /usr/include/errno.h /usr/include/x86_64-linux-gnu/bits/errno.h \
+ /usr/include/linux/errno.h /usr/include/x86_64-linux-gnu/asm/errno.h \
 /usr/include/asm-generic/errno.h /usr/include/asm-generic/errno-base.h \
 /usr/include/x86_64-linux-gnu/bits/types/error_t.h \
 /usr/include/c++/15/bits/charconv.h \
@@ -195,4 +203,6 @@ CMakeFiles/mixer.dir/src/MixerChannelStrip.cpp.o: \
 /usr/include/c++/15/tr1/poly_hermite.tcc \
 /usr/include/c++/15/tr1/poly_laguerre.tcc \
 /usr/include/c++/15/tr1/riemann_zeta.tcc /usr/include/c++/15/cstring \
- /usr/include/string.h /usr/include/strings.h
+ /usr/include/string.h /usr/include/strings.h \
+ /usr/include/x86_64-linux-gnu/bits/strings_fortified.h \
+ /usr/include/x86_64-linux-gnu/bits/string_fortified.h
@@ -65,6 +65,8 @@ CMakeFiles/mixer.dir/src/MixerEngine.cpp.o: \
 /usr/include/x86_64-linux-gnu/bits/types/FILE.h \
 /usr/include/x86_64-linux-gnu/bits/types/locale_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__locale_t.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/wchar2.h \
 /usr/include/c++/15/bits/shared_ptr_base.h /usr/include/c++/15/typeinfo \
 /usr/include/c++/15/bits/allocated_ptr.h \
 /usr/include/c++/15/bits/refwrap.h \
@@ -165,16 +167,22 @@ CMakeFiles/mixer.dir/src/MixerEngine.cpp.o: \
 /usr/include/x86_64-linux-gnu/sys/select.h \
 /usr/include/x86_64-linux-gnu/bits/select.h \
 /usr/include/x86_64-linux-gnu/bits/types/sigset_t.h \
- /usr/include/alloca.h /usr/include/x86_64-linux-gnu/bits/stdlib-float.h \
+ /usr/include/x86_64-linux-gnu/bits/select2.h \
+ /usr/include/x86_64-linux-gnu/bits/select-decl.h /usr/include/alloca.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib-bsearch.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib-float.h \
+ /usr/include/x86_64-linux-gnu/bits/stdlib.h \
 /usr/include/c++/15/bits/std_abs.h /usr/include/c++/15/cstdio \
 /usr/include/stdio.h /usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h \
 /usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h \
 /usr/include/x86_64-linux-gnu/bits/types/cookie_io_functions_t.h \
 /usr/include/x86_64-linux-gnu/bits/stdio_lim.h \
- /usr/include/c++/15/cerrno /usr/include/errno.h \
- /usr/include/x86_64-linux-gnu/bits/errno.h /usr/include/linux/errno.h \
- /usr/include/x86_64-linux-gnu/asm/errno.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2-decl.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio2.h /usr/include/c++/15/cerrno \
+ /usr/include/errno.h /usr/include/x86_64-linux-gnu/bits/errno.h \
+ /usr/include/linux/errno.h /usr/include/x86_64-linux-gnu/asm/errno.h \
 /usr/include/asm-generic/errno.h /usr/include/asm-generic/errno-base.h \
 /usr/include/x86_64-linux-gnu/bits/types/error_t.h \
 /usr/include/c++/15/bits/charconv.h \
@@ -12,7 +12,7 @@ if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
    string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
           CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
  else()
-    set(CMAKE_INSTALL_CONFIG_NAME "")
+    set(CMAKE_INSTALL_CONFIG_NAME "Release")
  endif()
  message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
 endif()
@@ -12,7 +12,7 @@ if(NOT DEFINED CMAKE_INSTALL_CONFIG_NAME)
    string(REGEX REPLACE "^[^A-Za-z0-9_]+" ""
           CMAKE_INSTALL_CONFIG_NAME "${BUILD_TYPE}")
  else()
-    set(CMAKE_INSTALL_CONFIG_NAME "")
+    set(CMAKE_INSTALL_CONFIG_NAME "Release")
  endif()
  message(STATUS "Install configuration: \"${CMAKE_INSTALL_CONFIG_NAME}\"")
 endif()
@@ -0,0 +1,40 @@
+[Unit]
+Description=OPLabs Mixer Daemon (C++ JACK Audio Mixer)
+Documentation=https://gitea.ourpad.casa/oplabs/oplabs-mixer-daemon
+After=network.target sound.target
+Wants=jack.service
+
+StartLimitBurst=5
+StartLimitIntervalSec=30
+
+[Service]
+Type=simple
+User=oplabs
+Group=oplabs
+WorkingDirectory=/home/oplabs/projects/oplabs-mixer-daemon
+
+SyslogIdentifier=oplabs-mixer-daemon
+
+# The daemon binary (from cmake build)
+ExecStart=/home/oplabs/projects/oplabs-mixer-daemon/build/mixer-daemon \
+    --socket /tmp/oplabs-mixer.sock \
+    --inputs 2 \
+    --outputs 2
+
+# Audio process gets high priority
+CPUSchedulingPolicy=fifo
+CPUSchedulingPriority=10
+Nice=-10
+LimitRTPRIO=95
+LimitMEMLOCK=infinity
+
+# Restart on crash with delay
+Restart=always
+RestartSec=5
+
+# Log everything to journald
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=multi-user.target
@@ -70,7 +70,19 @@ void MixerControlServer::stop()
 {
    running_ = false;
    if (serverFd_ >= 0) {
-        close(serverFd_);
+        // Connect to ourselves to unblock accept() in the server thread.
+        // shutdown() on a listening socket does not reliably interrupt accept()
+        // across all Linux kernels; a self-connect is the standard workaround.
+        struct sockaddr_un addr;
+        memset(&addr, 0, sizeof(addr));
+        addr.sun_family = AF_UNIX;
+        strncpy(addr.sun_path, socketPath_.c_str(), sizeof(addr.sun_path) - 1);
+        int tmpFd = socket(AF_UNIX, SOCK_STREAM, 0);
+        if (tmpFd >= 0) {
+            ::connect(tmpFd, (struct sockaddr*)&addr, sizeof(addr));
+            ::close(tmpFd);
+        }
+        ::close(serverFd_);
        serverFd_ = -1;
    }
    if (serverThread_.joinable()) {
@@ -239,6 +251,35 @@ std::string MixerControlServer::processCommand(const std::string& commandJson)
            return json({{"status", "ok"}}).dump();
        }

+        if (command == "getOutputRoutes") {
+            auto routes = engine_->outputRoutes();
+            json jroutes = json::array();
+            for (const auto& route : routes) {
+                json r;
+                r["sourceBusId"] = route.sourceBusId;
+                r["sourceStartChannel"] = route.sourceStartChannel;
+                r["targetStartChannel"] = route.targetStartChannel;
+                r["channels"] = route.channels;
+                jroutes.push_back(r);
+            }
+            return json({{"status", "ok"}, {"routes", jroutes}}).dump();
+        }
+
+        if (command == "setOutputRoutes") {
+            auto routes = cmd.value("routes", json::array());
+            std::vector<MixerOutputRoute> outputRoutes;
+            for (const auto& r : routes) {
+                MixerOutputRoute route;
+                route.sourceBusId = r.value("sourceBusId", (int64_t)0);
+                route.sourceStartChannel = r.value("sourceStartChannel", 0);
+                route.targetStartChannel = r.value("targetStartChannel", 0);
+                route.channels = r.value("channels", 2);
+                outputRoutes.push_back(route);
+            }
+            engine_->setOutputRoutes(outputRoutes);
+            return json({{"status", "ok"}}).dump();
+        }
+
        return json({{"status", "error"}, {"message", "unknown command: " + command}}).dump();

    } catch (const json::parse_error& e) {
@@ -5,6 +5,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <signal.h>
+#include <syslog.h>
 #include <atomic>
 #include <string>
 #include <vector>
@@ -112,6 +113,10 @@ int main(int argc, char* argv[])
        }
    }

+    // Initialize syslog for structured journald logging
+    openlog("mixer-daemon", LOG_PID | LOG_NDELAY, LOG_DAEMON);
+
+    syslog(LOG_INFO, "mixer-daemon starting...");
    fprintf(stderr, "mixer-daemon starting...\n");
    fprintf(stderr, "  Socket: %s\n", socketPath);
    fprintf(stderr, "  Channels: %d in / %d out\n", inputChannels, outputChannels);
@@ -132,19 +137,23 @@ int main(int argc, char* argv[])
    jack_status_t jackStatus;
    g_jackClient = jack_client_open(kJackClientName, JackNullOption, &jackStatus);
    if (!g_jackClient) {
+        syslog(LOG_ERR, "Failed to open JACK client (status=0x%x). Running headless.", jackStatus);
        fprintf(stderr, "Failed to open JACK client (status=0x%x). Is JACK running?\n", jackStatus);

        // Fallback: run without JACK (dry/headless mode)
+        syslog(LOG_WARNING, "Running in headless mode (no JACK audio I/O).");
        fprintf(stderr, "Running in headless mode (no JACK audio I/O).\n");
        g_engine = &engine;
-
        // Still create the mixer control server
        mixer::MixerControlServer server(&engine, socketPath);
        if (!server.start()) {
+            syslog(LOG_ERR, "Failed to start control server at %s", socketPath);
            fprintf(stderr, "Failed to start control server at %s\n", socketPath);
+            closelog();
            return 1;
        }

+        syslog(LOG_INFO, "Control server running at %s (headless mode).", socketPath);
        fprintf(stderr, "Control server running at %s. Press Ctrl+C to stop.\n", socketPath);

        // Wait for shutdown signal
@@ -153,12 +162,14 @@ int main(int argc, char* argv[])
        }

        server.stop();
+        closelog();
        return 0;
    }

    // Get actual sample rate and buffer size from JACK
    sampleRate = jack_get_sample_rate(g_jackClient);
    bufferSize = jack_get_buffer_size(g_jackClient);
+    syslog(LOG_INFO, "JACK active — sample rate: %u, buffer: %u", sampleRate, bufferSize);
    fprintf(stderr, "JACK active — sample rate: %u, buffer: %u\n", sampleRate, bufferSize);

    // Reconfigure engine with actual JACK parameters
@@ -177,6 +188,7 @@ int main(int argc, char* argv[])
            g_jackClient, name, JACK_DEFAULT_AUDIO_TYPE,
            JackPortIsInput, 0);
        if (!port) {
+            syslog(LOG_ERR, "Failed to register input port %s", name);
            fprintf(stderr, "Failed to register input port %s\n", name);
        } else {
            g_inputPorts.push_back(port);
@@ -190,6 +202,7 @@ int main(int argc, char* argv[])
            g_jackClient, name, JACK_DEFAULT_AUDIO_TYPE,
            JackPortIsOutput, 0);
        if (!port) {
+            syslog(LOG_ERR, "Failed to register output port %s", name);
            fprintf(stderr, "Failed to register output port %s\n", name);
        } else {
            g_outputPorts.push_back(port);
@@ -205,6 +218,7 @@ int main(int argc, char* argv[])

    // --- Activate JACK client ---
    if (jack_activate(g_jackClient) != 0) {
+        syslog(LOG_ERR, "Failed to activate JACK client.");
        fprintf(stderr, "Failed to activate JACK client.\n");
        jack_client_close(g_jackClient);
        return 1;
@@ -213,12 +227,14 @@ int main(int argc, char* argv[])
    // --- Start control server ---
    mixer::MixerControlServer server(&engine, socketPath);
    if (!server.start()) {
+        syslog(LOG_ERR, "Failed to start control server at %s", socketPath);
        fprintf(stderr, "Failed to start control server at %s\n", socketPath);
        jack_deactivate(g_jackClient);
        jack_client_close(g_jackClient);
        return 1;
    }

+    syslog(LOG_INFO, "mixer-daemon running. Socket at %s.", socketPath);
    fprintf(stderr, "mixer-daemon running. Socket at %s. Press Ctrl+C to stop.\n", socketPath);

    // --- Main loop: wait for shutdown ---
@@ -226,6 +242,7 @@ int main(int argc, char* argv[])
        std::this_thread::sleep_for(std::chrono::milliseconds(200));
    }

+    syslog(LOG_INFO, "Shutting down...");
    fprintf(stderr, "\nShutting down...\n");

    // --- Cleanup ---
@@ -233,6 +250,9 @@ int main(int argc, char* argv[])
    jack_deactivate(g_jackClient);
    jack_client_close(g_jackClient);

+    syslog(LOG_INFO, "mixer-daemon stopped.");
    fprintf(stderr, "mixer-daemon stopped.\n");
+
+    closelog();
    return 0;
 }