14.5 用一个线程处理所有信号

#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)
{
    printf("yyyyy, thread id is: %ld\n", pthread_self());
    sigset_t aset;
    int s, sig;
    sigemptyset(&aset);
    sigaddset(&aset, SIGQUIT);
    sigaddset(&aset, SIGUSR1);
    //s = pthread_sigmask(SIG_BLOCK, &aset, NULL);
    sigset_t *set = (sigset_t *)arg;

    for (;;) {
        s = sigwait(set, &sig);
        if (s != 0)
            handle_error_en(s, "sigwait");
        printf("Signal handling thread got signal %d\n", sig);
    }
}

static void handler(int arg)
{
    printf("xxxxx, thread id is: %ld\n", pthread_self());
}

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. */

    signal(SIGQUIT, handler);
    //           if (s != 0)
      //             handle_error_en(s, "pthread_sigmask");

    s = pthread_create(&thread, NULL, &sig_thread, (void *)&set);
    sigemptyset(&set);
    sigaddset(&set, SIGQUIT);
    sigaddset(&set, SIGUSR1);
    //s = pthread_sigmask(SIG_BLOCK, &set, NULL);
    if (s != 0)
        handle_error_en(s, "pthread_create");
    printf("sub thread with id: %ld\n", thread);
    /* Main thread carries on to create other threads and/or do
*               other work */

    pause();            /* Dummy pause so we can test program */
}