block.c

基于网络编程的例子

/*
 * block.c - Blocking signals
 */
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>

void err_quit(char *);

int main(void)
{
     sigset_t newset;

     /* Create the set */
     if((sigemptyset(&newset)) < 0)
	  err_quit("sigemptyset");
     /* Adding SIGTERM and SIGALRM */
     if((sigaddset(&newset, SIGTERM)) < 0)
	  err_quit("sigaddset:SIGTERM");
     if((sigaddset(&newset, SIGALRM)) < 0)
	  err_quit("sigaddset:SIGALRM");
     
     /* Block the signals without handling them */
     if((sigprocmask(SIG_BLOCK, &newset, NULL)) < 0)
	  err_quit("sigprocmask");

     /* Wait for a signal */
     pause();
     
     exit(EXIT_SUCCESS);
}
     
void err_quit(char *msg)
{
     perror(msg);
     exit(EXIT_FAILURE);
}