pthread_sigmask(3)

#include <signal.h>

int pthread_sigmask(int \nhow\n, const sigset_t *\nset\n, sigset_t *\noldset\n);

\n
    _POSIX_C_SOURCE >= 199506L || _XOPEN_SOURCE >= 500

$\n ./a.out &\n
[1] 5423
$\n kill -QUIT %1\n
Signal handling thread got signal 3
$\n kill -USR1 %1\n
Signal handling thread got signal 10
$\n kill -TERM %1\n
[1]+  Terminated              ./a.out

#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/* Simple error handling functions */
#define handle_error_en(en, msg) \
\n
        do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)
static void *
sig_thread(void *arg)
{
\n
    sigset_t *set = arg;
\n
    int s, sig;
\n
    for (;;) {
\n
        s = sigwait(set, &sig);
\n
        if (s != 0)
\n
            handle_error_en(s, "sigwait");
\n
        printf("Signal handling thread got signal %d\n", sig);
\n
    }
}
int
main(void)
{
\n
    pthread_t thread;
\n
    sigset_t set;
\n
    int s;
\n
    /* Block SIGQUIT and SIGUSR1; other threads created by main()
\n
       will inherit a copy of the signal mask. */
\n
    sigemptyset(&set);
\n
    sigaddset(&set, SIGQUIT);
\n
    sigaddset(&set, SIGUSR1);
\n
    s = pthread_sigmask(SIG_BLOCK, &set, NULL);
\n
    if (s != 0)
\n
        handle_error_en(s, "pthread_sigmask");
\n
    s = pthread_create(&thread, NULL, &sig_thread, &set);
\n
    if (s != 0)
\n
        handle_error_en(s, "pthread_create");
\n
    /* Main thread carries on to create other threads and/or do
\n
       other work. */
\n
    pause();            /* Dummy pause so we can test program */
}