Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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liang.huang 170a989ccb libc/builtin: support per-application priority/stacksize under KERNEL build.
nsh_fileapp() could not apply an application's Kconfig-configured
priority/stacksize via posix_spawn() under CONFIG_BUILD_KERNEL, because
the registry table (struct builtin_s / g_builtins[]) was gated on
CONFIG_BUILTIN, which depends on !BUILD_KERNEL. Those settings were
silently ignored in KERNEL builds.

CONFIG_BUILTIN conflates the table with main_t-based dispatch, which is
meaningless under CONFIG_BUILD_KERNEL. Add a hidden derived symbol,
APP_REGISTRY, that tracks table availability independently of dispatch:

  config APP_REGISTRY
          bool
          default y if BUILTIN || BUILD_KERNEL

Switch the guards on the table itself (Make.defs, builtin.h) from
CONFIG_BUILTIN to CONFIG_APP_REGISTRY. Call sites that dereference
builtin->main stay gated on CONFIG_BUILTIN and remain unreachable
under CONFIG_BUILD_KERNEL.

Signed-off-by: liang.huang <liang.huang@houmo.ai>
2026-07-13 15:23:39 -03:00
.github arch/arm/src/stm32: unify pulse count driver into common/stm32 2026-07-12 09:35:51 +08:00
arch drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
audio drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
binfmt fs/binfmt: Enforce POSIX execute permissions prior to binary load 2026-06-13 21:07:01 +08:00
boards Documentation: system: cu: document the cu serial terminal 2026-07-13 09:35:18 -04:00
cmake cmake/romfs: invoke passwd helper scripts via POSIX shell 2026-07-09 22:41:11 +08:00
crypto drivers/efuse/efuse: Drivers Registered With World Write Permissions(Part 1) 2026-07-13 12:08:01 +02:00
Documentation Documentation: system: cu: document the cu serial terminal 2026-07-13 09:35:18 -04:00
drivers drivers/net/w5500: fix wrong variable and d_private assignment 2026-07-13 15:02:02 -03:00
dummy build: add initial cmake build system 2023-07-08 13:50:48 +08:00
fs fs/procfs: fix incorrect environ read for another task under CONFIG_ARCH_ADDRENV 2026-07-11 12:43:10 -03:00
graphics !include/fcntl.h: align open flags with Linux values 2026-06-30 13:43:44 +08:00
include libc/builtin: support per-application priority/stacksize under KERNEL build. 2026-07-13 15:23:39 -03:00
libs libc/builtin: support per-application priority/stacksize under KERNEL build. 2026-07-13 15:23:39 -03:00
mm mm/umm_heap: disable KASAN for user-space heap in kernel build 2026-07-03 07:51:11 +02:00
net !include/fcntl.h: align open flags with Linux values 2026-06-30 13:43:44 +08:00
openamp openamp: fix CMake dcache option 2026-05-10 15:03:24 +02:00
pass1 Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
sched drivers/timers, sched/clock: use file_get/file_put 2026-07-11 17:22:07 -04:00
syscall syscall: fcntl param3 type to uintptr_t 2026-04-27 12:01:55 -03:00
tools ci/platforms/darwin.sh: fix genromfs installation 2026-07-12 22:21:24 +02:00
video video: ensure video library is non-empty 2026-05-08 19:51:39 +08:00
wireless include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
.asf.yaml github: master branch protection tune. 2025-05-07 18:37:13 -05:00
.codespell-ignore-lines !boards: Remove NSH_ARCHINIT and board_app_initialize 2026-05-02 18:36:46 +08:00
.codespellrc arch/sim: replace macOS C++ constructor runtime hack with post-link patch 2026-05-19 07:08:55 -03:00
.editorconfig .editorconfig: fix character encoding property specification 2025-11-28 19:12:13 +08:00
.gitignore git: Specify multiple build directories in .gitignore. 2026-05-20 03:06:58 +08:00
.gitmessage docs/contributing: Add a commit message template 2025-06-03 17:33:24 +08:00
.pre-commit-config.yaml pre-commit: enable codespell checks 2025-05-05 12:34:39 +08:00
.yamllint feat: add a GitHub action to lint the YAML files 2020-12-15 09:52:04 -06:00
AUTHORS AUTHORS: add Eren Terzioglu 2026-05-20 15:17:00 +08:00
CMakeLists.txt cmake/nuttx_toolchain.cmake: track preprocessed include deps 2026-06-04 17:22:43 +08:00
CONTRIBUTING.md contributing: Add requirement for 'Assisted-by' commit field 2026-07-12 09:42:28 +08:00
INVIOLABLES.md INVIOLABLES.md: Fix a simple alignment and change occurrences of Nuttx 2020-09-03 01:33:05 +08:00
Kconfig sched/misc/assert: Add CONFIG_SCHED_DUMP_TASKS and CONFIG_SCHED_DUMP_STACK 2026-06-09 08:04:54 -04:00
LICENSE libs/libdsp: Add Matrix operations 2026-07-11 14:55:59 -03:00
Makefile !boards: enforce secure ROMFS passwd and TEA key setup 2026-07-09 22:41:11 +08:00
NOTICE Remove the double blank line from source files 2022-02-20 20:10:14 +01:00
README.md ci/testing: Add MemBrowse Integration 2026-06-18 12:07:41 -03:00
ReleaseNotes Documentation: move ReleaseNotes 2023-09-26 20:41:00 +08:00

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Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).

For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.

Getting Started

First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.

Documentation

You can find the current NuttX documentation on the Documentation Page.

Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.

The old NuttX documentation is still available in the Apache wiki.

Supported Boards

NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.

Contributing

If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.

License

The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.