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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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syscall/syscall.csv
+7 -7
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@@ -105,10 +105,10 @@
"pipe2","unistd.h","defined(CONFIG_PIPES) && CONFIG_DEV_PIPE_SIZE > 0","int","int [2]|FAR int *","int"
"poll","poll.h","","int","FAR struct pollfd *","nfds_t","int"
"posix_spawn","spawn.h","!defined(CONFIG_BINFMT_DISABLE) && defined(CONFIG_LIBC_EXECFUNCS)","int","FAR pid_t *","FAR const char *","FAR const posix_spawn_file_actions_t *","FAR const posix_spawnattr_t *","FAR char * const []|FAR char * const *","FAR char * const []|FAR char * const *"
"ppoll","poll.h","","int","FAR struct pollfd *","nfds_t","FAR const struct timespec *","FAR const sigset_t *"
"ppoll","poll.h","!defined(CONFIG_DISABLE_ALL_SIGNALS)","int","FAR struct pollfd *","nfds_t","FAR const struct timespec *","FAR const sigset_t *"
"prctl","sys/prctl.h","","int","int","...","uintptr_t","uintptr_t"
"pread","unistd.h","","ssize_t","int","FAR void *","size_t","off_t"
"pselect","sys/select.h","","int","int","FAR fd_set *","FAR fd_set *","FAR fd_set *","FAR const struct timespec *","FAR const sigset_t *"
"pselect","sys/select.h","!defined(CONFIG_DISABLE_ALL_SIGNALS)","int","int","FAR fd_set *","FAR fd_set *","FAR fd_set *","FAR const struct timespec *","FAR const sigset_t *"
"pthread_cancel","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","pthread_t"
"pthread_cond_broadcast","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_cond_t *"
"pthread_cond_clockwait","pthread.h","!defined(CONFIG_DISABLE_PTHREAD)","int","FAR pthread_cond_t *","FAR pthread_mutex_t *","clockid_t","FAR const struct timespec *"
@@ -177,11 +177,11 @@
"signal","signal.h","defined(CONFIG_ENABLE_ALL_SIGNALS)","_sa_handler_t","int","_sa_handler_t"
"signalfd","sys/signalfd.h","defined(CONFIG_SIGNAL_FD)","int","int","FAR const sigset_t *","int"
"sigpending","signal.h","defined(CONFIG_ENABLE_ALL_SIGNALS)","int","FAR sigset_t *"
"sigprocmask","signal.h","","int","int","FAR const sigset_t *","FAR sigset_t *"
"sigqueue","signal.h","","int","int","int","union sigval|FAR void *|sival_ptr"
"sigsuspend","signal.h","","int","FAR const sigset_t *"
"sigtimedwait","signal.h","","int","FAR const sigset_t *","FAR struct siginfo *","FAR const struct timespec *"
"sigwaitinfo","signal.h","","int","FAR const sigset_t *","FAR struct siginfo *"
"sigprocmask","signal.h","!defined(CONFIG_DISABLE_ALL_SIGNALS)","int","int","FAR const sigset_t *","FAR sigset_t *"
"sigqueue","signal.h","!defined(CONFIG_DISABLE_ALL_SIGNALS)","int","int","int","union sigval|FAR void *|sival_ptr"
"sigsuspend","signal.h","!defined(CONFIG_DISABLE_ALL_SIGNALS)","int","FAR const sigset_t *"
"sigtimedwait","signal.h","!defined(CONFIG_DISABLE_ALL_SIGNALS)","int","FAR const sigset_t *","FAR struct siginfo *","FAR const struct timespec *"
"sigwaitinfo","signal.h","!defined(CONFIG_DISABLE_ALL_SIGNALS)","int","FAR const sigset_t *","FAR struct siginfo *"
"socket","sys/socket.h","defined(CONFIG_NET)","int","int","int","int"
"socketpair","sys/socket.h","defined(CONFIG_NET)","int","int","int","int","int [2]|FAR int *"
"stat","sys/stat.h","","int","FAR const char *","FAR struct stat *"
1 _assert assert.h void FAR const char * int FAR const char * FAR void *
105 pipe2 unistd.h defined(CONFIG_PIPES) && CONFIG_DEV_PIPE_SIZE > 0 int int [2]|FAR int * int
106 poll poll.h int FAR struct pollfd * nfds_t int
107 posix_spawn spawn.h !defined(CONFIG_BINFMT_DISABLE) && defined(CONFIG_LIBC_EXECFUNCS) int FAR pid_t * FAR const char * FAR const posix_spawn_file_actions_t * FAR const posix_spawnattr_t *
108 ppoll poll.h !defined(CONFIG_DISABLE_ALL_SIGNALS) int FAR struct pollfd * nfds_t FAR const struct timespec * FAR const sigset_t *
109 prctl sys/prctl.h int int ... uintptr_t uintptr_t
110 pread unistd.h ssize_t int FAR void * size_t off_t
111 pselect sys/select.h !defined(CONFIG_DISABLE_ALL_SIGNALS) int int FAR fd_set * FAR fd_set * FAR fd_set *
112 pthread_cancel pthread.h !defined(CONFIG_DISABLE_PTHREAD) int pthread_t
113 pthread_cond_broadcast pthread.h !defined(CONFIG_DISABLE_PTHREAD) int FAR pthread_cond_t *
114 pthread_cond_clockwait pthread.h !defined(CONFIG_DISABLE_PTHREAD) int FAR pthread_cond_t * FAR pthread_mutex_t * clockid_t FAR const struct timespec *
177 signal signal.h defined(CONFIG_ENABLE_ALL_SIGNALS) _sa_handler_t int _sa_handler_t
178 signalfd sys/signalfd.h defined(CONFIG_SIGNAL_FD) int int FAR const sigset_t * int
179 sigpending signal.h defined(CONFIG_ENABLE_ALL_SIGNALS) int FAR sigset_t *
180 sigprocmask signal.h !defined(CONFIG_DISABLE_ALL_SIGNALS) int int FAR const sigset_t * FAR sigset_t *
181 sigqueue signal.h !defined(CONFIG_DISABLE_ALL_SIGNALS) int int int union sigval|FAR void *|sival_ptr
182 sigsuspend signal.h !defined(CONFIG_DISABLE_ALL_SIGNALS) int FAR const sigset_t *
183 sigtimedwait signal.h !defined(CONFIG_DISABLE_ALL_SIGNALS) int FAR const sigset_t * FAR struct siginfo * FAR const struct timespec *
184 sigwaitinfo signal.h !defined(CONFIG_DISABLE_ALL_SIGNALS) int FAR const sigset_t * FAR struct siginfo *
185 socket sys/socket.h defined(CONFIG_NET) int int int int
186 socketpair sys/socket.h defined(CONFIG_NET) int int int int int [2]|FAR int *
187 stat sys/stat.h int FAR const char * FAR struct stat *