pthread_sigmask(3) Library Functions Manual pthread_sigmask(3) pthread_sigmask - POSIX (libpthread -lpthread) #include int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset); glibc ( feature_test_macros(7)): pthread_sigmask(): _POSIX_C_SOURCE >= 199506L || _XOPEN_SOURCE >= 500 pthread_sigmask() sigprocmask(2) POSIX.1. . sigprocmask(2). pthread_sigmask() 0 . sigprocmask(2). attributes(7). +------------+------------------------------------+--------------------+ || | | +------------+------------------------------------+--------------------+ |pthread_sigmask()| | MT-Safe | | | | | +------------+------------------------------------+--------------------+ POSIX.1-2008. POSIX.1-2001. . glibc pthread_sigmask() NPTL. nptl(7) . sigwait(3). : $ ./a.out & [1] 5423 $ kill -QUIT %1 Signal handling thread got signal 3 $ kill -USR1 %1 Signal handling thread got signal 10 $ kill -TERM %1 [1]+ Terminated ./a.out #include #include #include #include #include #include #include /* Simple error handling functions */ static void * sig_thread(void *arg) { sigset_t *set = arg; int s, sig; for (;;) { s = sigwait(set, &sig); if (s != 0) errc(EXIT_FAILURE, s, "sigwait"); printf("Signal handling thread got signal %d\n", sig); } } int main(void) { pthread_t thread; sigset_t set; int s; /* Block SIGQUIT and SIGUSR1; other threads created by main() will inherit a copy of the signal mask. */ sigemptyset(&set); sigaddset(&set, SIGQUIT); sigaddset(&set, SIGUSR1); s = pthread_sigmask(SIG_BLOCK, &set, NULL); if (s != 0) errc(EXIT_FAILURE, s, "pthread_sigmask"); s = pthread_create(&thread, NULL, &sig_thread, &set); if (s != 0) errc(EXIT_FAILURE, s, "pthread_create"); /* Main thread carries on to create other threads and/or do other work. */ pause(); /* Dummy pause so we can test program */ } sigaction(2), sigpending(2), sigprocmask(2), pthread_attr_setsigmask_np(3), pthread_create(3), pthread_kill(3), sigsetops(3), pthreads(7), signal(7) 3 . . : . 6.18 21 2025 pthread_sigmask(3)