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pthread_sigmask
Langue: en
Version: 2009-01-25 (fedora - 05/07/09)
Section: 3 (Bibliothèques de fonctions)
Sommaire
NAME
pthread_sigmask - examine and change mask of blocked signalsSYNOPSIS
#include <signal.h> int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
Compile and link with -pthread.
DESCRIPTION
The pthread_sigmask() function is just like sigprocmask(2), with the difference that its use in multithreaded programs is explicitly specified by POSIX.1-2001. Other differences are noted in this page.For a description of the arguments and operation of this function, see sigprocmask(2).
RETURN VALUE
On success, pthread_sigmask() returns 0; on error, it returns an error number.ERRORS
See sigprocmask(2).CONFORMING TO
POSIX.1-2001.NOTES
A new thread inherits a copy of its creator's signal mask.EXAMPLE
The program below blocks some signals in the main thread, and then creates a dedicated thread to fetch those signals via sigwait(3). The following shell session demonstrates its use:$ ./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
Program source
#include <pthread.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <signal.h> #include <errno.h> /* Simple error handling functions */ #define handle_error_en(en, msg) \ do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0) static void * sig_thread(void *arg) { sigset_t *set = (sigset_t *) arg; int s, sig; for (;;) { s = sigwait(set, &sig); if (s != 0) handle_error_en(s, "sigwait"); printf("Signal handling thread got signal %d\n", sig); } } int main(int argc, char *argv[]) { pthread_t thread; sigset_t set; int s; /* Block SIGINT; 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) handle_error_en(s, "pthread_sigmask"); s = pthread_create(&thread, NULL, &sig_thread, (void *) &set); if (s != 0) handle_error_en(s, "pthread_create"); /* Main thread carries on to create other threads and/or do other work */ pause(); /* Dummy pause so we can test program */ }
SEE ALSO
sigaction(2), sigpending(2), sigprocmask(2) pthread_create(3), pthread_kill(3), sigsetops(3), pthreads(7), signal(7)COLOPHON
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