11-9.c

《linux应用开发技术详解》的配套代码

#include <signal.h>
#include <stdio.h>


void sig_handler(int signo)
{
        switch(signo) {
                case SIGUSR1:
                        printf("Received SIGUSR1 signal.\n");
                        break;
                case SIGUSR2:
                        printf("Received SIGUSR2 signal.\n");
                        break;
                case SIGSEGV:
                        printf("Received SIGSEGV signal.\n");
                        break;
        }
}

int main(void)
{
        struct sigaction action;
        sigset_t sigmask;

        sigemptyset(&sigmask);
        sigaddset(&sigmask, SIGUSR1);
        sigaddset(&sigmask, SIGUSR2);
        sigaddset(&sigmask, SIGSEGV);
        memset(&action, 0, sizeof(action));
        action.sa_handler = sig_handler;
        action.sa_mask = sigmask;
        sigaction(SIGUSR1, &action, NULL);
        sigaction(SIGUSR2, &action, NULL);
        sigaction(SIGSEGV, &action, NULL);
        sigfillset(&sigmask);
        sigdelset(&sigmask, SIGUSR1);
        sigdelset(&sigmask, SIGUSR2);
        sigdelset(&sigmask, SIGSEGV);

        while (1) {
                sigsuspend(&sigmask);
        }
}