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sched/signal: Add support for disabling all signal functions

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Signals in NuttX serve two primary purposes:

      1. Synchronization and wake-up:
        Signals can be used to block threads on specific signal sets and later
        wake them up by delivering the corresponding signals to those threads.

      2. Asynchronous notification:
        Signals can also be used to install callback handlers for specific signals, allowing threads to
        asynchronously invoke those handlers when the signals are delivered.

    This change introduces the ability to  disable all signal functionality to reduce footprint for NuttX.

Signed-off-by: Chengdong Wang wangchengdong@lixiang.com
This commit is contained in:
wangchengdong
2026-01-12 09:11:52 +08:00
committed by Alan C. Assis
parent 0ea686bc5b
commit faf864b04f
19 changed files with 104 additions and 53 deletions
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include/sys/syscall_lookup.h
+2
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@@ -158,11 +158,13 @@ SYSCALL_LOOKUP(tgkill, 3)
SYSCALL_LOOKUP(sigaction, 3)
SYSCALL_LOOKUP(sigpending, 1)
#endif
#ifndef CONFIG_DISABLE_ALL_SIGNALS
SYSCALL_LOOKUP(sigprocmask, 3)
SYSCALL_LOOKUP(sigqueue, 3)
SYSCALL_LOOKUP(sigsuspend, 1)
SYSCALL_LOOKUP(sigtimedwait, 3)
SYSCALL_LOOKUP(sigwaitinfo, 2)
#endif
SYSCALL_LOOKUP(clock_nanosleep, 4)
/* The following are only defined if the system clock is enabled in the