apps: decouple signal support #3217

extinguish · 2025-11-20T13:16:10Z

Summary

Added support for signal decoupling, primarily involving modifications to the following modules in the apps: ostest, nsh/tools, netutils, and the cu tool.

ostest: When CONFIG_DISABLE_SIGNALS=y, certain tests that rely on signal functionality need to be disabled.
nsh/tools: Functionalities dependent on the signal module have been made configurable, allowing most parts of nsh to remain usable even when CONFIG_DISABLE_SIGNALS=y.
netutils: Ensures basic usability of certain network functionalities when signals are disabled.
cu tool: Refactored portions of the cu module implementation to maintain its usability under signal-disabled conditions.

Impact

No adjustments were made to the functional logic; support was only added for when CONFIG_DISABLE_SIGNALS=y.

Testing

has passed the ostest

1. sigprocmask_test/sighand_test/signest_test/suspend_test: these testcases are using to test the signal api 2. sigev_thread_test: this testcase need to access signal related function 3. timer_test: this testcase need to access signal related function Signed-off-by: guoshichao <[email protected]>

make the nsh tools can work with SIGNAL disabled Signed-off-by: guoshichao <[email protected]>

using pthread_cancel to implement the exit logic, thus to make the netutils tools can work when signal disabled Signed-off-by: guoshichao <[email protected]>

using the local cu_globals_s instance to manange the cu exit procedure Signed-off-by: guoshichao <[email protected]>

merge the cu.h to cu_main.c, to make the cu tools code more cleaner Signed-off-by: guoshichao <[email protected]>

The core functionality of the cu tool does not rely on signal features. Therefore, we can isolate the signal-related implementations to ensure that most functions of the cu tool remain operational even when signals are disabled. Signed-off-by: guoshichao <[email protected]>

The commit 'add support for CONFIG_DISABLE_SIGNALS' led to: undefined reference to `signal' undefined reference to `sigaction' Signed-off-by: v-tangmeng <[email protected]>

…GNALS The commit 'add support for CONFIG_DISABLE_SIGNALS' led to: undefined reference to `sigaction' Signed-off-by: v-tangmeng <[email protected]>

cederom

Thank you @extinguish great work!

This PR is a prototype for testing and goes in pair with apache/nuttx#17352. Needs careful review and testing. When parent PR is merged this one goes in pair :-)

I am just marking RC here not to merge by accident :-)

xiaoxiang781216 · 2025-11-24T08:42:11Z

Thank you @extinguish great work!

This PR is a prototype for testing and goes in pair with apache/nuttx#17352. Needs careful review and testing. When parent PR is merged this one goes in pair :-)

I am just marking RC here not to merge by accident :-)

@cederom this patch need be merged first to unlock ci error on apache/nuttx#17352. If the community accept to add DISABLE_SIGNALS option, it's better to merge this simple pr first, so we can ensure the kernel side change don't break any build.

acassis · 2025-11-24T10:56:06Z

@xiaoxiang781216 Do you know if @extinguish is doing it coordinated with @wangchdo ? Otherwise we will have many issues.

xiaoxiang781216 · 2025-11-24T11:21:32Z

@xiaoxiang781216 Do you know if @extinguish is doing it coordinated with @wangchdo ? Otherwise we will have many issues.

@extinguish 's userspace change is the subset of @wangchdo 's since @wangchdo disable the full signal feature.

xiaoxiang781216 · 2025-11-25T02:05:47Z

If the community agree to disable signal with option, it's better to merge this pr first, so both @extinguish and @wangchdo 's change can move forward and verify with ci. @cederom @acassis

acassis · 2025-11-25T10:30:30Z

@extinguish there are some errors, i.e.:

Configuration/Tool: lm3s6965-ek/qemu-protected,CONFIG_ARM_TOOLCHAIN_GNU_EABI
2025-11-25 09:18:02
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Disabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Enabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Building NuttX...
arm-none-eabi-ld: /github/workspace/sources/nuttx/staging//libapps.a(test_symtab.o):(.rodata.g_elf_exports+0xe4): undefined reference to `register_driver'
arm-none-eabi-ld: /github/workspace/sources/nuttx/staging//libapps.a(test_symtab.o):(.rodata.g_elf_exports+0x15c): undefined reference to `unregister_driver'
make[1]: *** [Makefile:61: nuttx_user.elf] Error 1
make[1]: Target 'all' not remade because of errors.
make: *** [tools/Unix.mk:541: nuttx] Error 2
make: Target 'all' not remade because of errors.
/github/workspace/sources/nuttx/tools/testbuild.sh: line 385: /github/workspace/sources/nuttx/../nuttx/nuttx.manifest: No such file or directory

extinguish · 2025-11-25T13:10:41Z

@extinguish there are some errors, i.e.:

Configuration/Tool: lm3s6965-ek/qemu-protected,CONFIG_ARM_TOOLCHAIN_GNU_EABI
2025-11-25 09:18:02
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Disabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Enabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Building NuttX...
arm-none-eabi-ld: /github/workspace/sources/nuttx/staging//libapps.a(test_symtab.o):(.rodata.g_elf_exports+0xe4): undefined reference to `register_driver'
arm-none-eabi-ld: /github/workspace/sources/nuttx/staging//libapps.a(test_symtab.o):(.rodata.g_elf_exports+0x15c): undefined reference to `unregister_driver'
make[1]: *** [Makefile:61: nuttx_user.elf] Error 1
make[1]: Target 'all' not remade because of errors.
make: *** [tools/Unix.mk:541: nuttx] Error 2
make: Target 'all' not remade because of errors.
/github/workspace/sources/nuttx/tools/testbuild.sh: line 385: /github/workspace/sources/nuttx/../nuttx/nuttx.manifest: No such file or directory

this is fixed in updated pull request

xiaoxiang781216 · 2025-11-25T15:22:36Z

@extinguish but the same error still report.

extinguish · 2025-11-26T01:30:05Z

@extinguish but the same error still report.

Got it, I'm fixing it now, this is a new issue introduced by supporting the protect build process for mksym_tab.c.

extinguish · 2025-11-27T01:54:44Z

@extinguish but the same error still report.

the "examples/elf project refactor and disable signal procedure" is separate to a new pull request, and the new pull request is based on #3223, after #3223 is review passed and merged, the examples/elf refactor pull request will upstreaming

github-actions bot added Area: Networking Area: System Area: Testing Area: NSH Size: M labels Nov 20, 2025

extinguish force-pushed the apps_signal_decouple branch from fc21c7e to 9845726 Compare November 21, 2025 02:02

extinguish added 6 commits November 21, 2025 10:36

nsh/tools: add support for DISABLE_SIGNALS

9b75138

make the nsh tools can work with SIGNAL disabled Signed-off-by: guoshichao <[email protected]>

netutils: make the net tools can work with signal disabled

21eba6b

using pthread_cancel to implement the exit logic, thus to make the netutils tools can work when signal disabled Signed-off-by: guoshichao <[email protected]>

cu: implement the cu exit logic like top cmd

3d74819

using the local cu_globals_s instance to manange the cu exit procedure Signed-off-by: guoshichao <[email protected]>

cu: merge the cu.h to cu_main.c

744eed5

merge the cu.h to cu_main.c, to make the cu tools code more cleaner Signed-off-by: guoshichao <[email protected]>

extinguish force-pushed the apps_signal_decouple branch from 9845726 to 67dd5d2 Compare November 21, 2025 02:37

TangMeng12 added 2 commits November 21, 2025 11:22

examples: fix the compilation error caused by CONFIG_DISABLE_SIGNALS

107b636

The commit 'add support for CONFIG_DISABLE_SIGNALS' led to: undefined reference to `signal' undefined reference to `sigaction' Signed-off-by: v-tangmeng <[email protected]>

examples/timer: fix the compilation error caused by CONFIG_DISABLE_SI…

15ca04b

…GNALS The commit 'add support for CONFIG_DISABLE_SIGNALS' led to: undefined reference to `sigaction' Signed-off-by: v-tangmeng <[email protected]>

github-actions bot added the Area: Examples label Nov 21, 2025

extinguish mentioned this pull request Nov 21, 2025

Support disable signal apache/nuttx#17357

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xiaoxiang781216 approved these changes Nov 24, 2025

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xiaoxiang781216 requested review from acassis and jerpelea November 24, 2025 06:05

cederom requested changes Nov 24, 2025

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cederom mentioned this pull request Nov 24, 2025

sched/signal: Add support to disable signals apache/nuttx#17352

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extinguish dismissed xiaoxiang781216’s stale review via ab0054a November 25, 2025 06:15

extinguish force-pushed the apps_signal_decouple branch from ab0054a to 69ee29e Compare November 25, 2025 06:55

github-actions bot added the Size: XL label Nov 25, 2025

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jerpelea changed the title ~~add signal decouple support~~ apps: decouple signal support Nov 25, 2025

jerpelea previously approved these changes Nov 25, 2025

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xiaoxiang781216 previously approved these changes Nov 25, 2025

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extinguish dismissed stale reviews from xiaoxiang781216 and jerpelea via c97bb67 November 25, 2025 13:09

github-actions bot added the Area: Tools label Nov 25, 2025

extinguish force-pushed the apps_signal_decouple branch from c97bb67 to 15ca04b Compare November 27, 2025 01:42

github-actions bot removed the Area: Tools label Nov 27, 2025

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