p8-11.c

SUN Solaris8平台下进程间通信

#include <signal.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include "err_exit.h"
int main(void)
{
    sigset_t base_mask, waiting_mask, oldmask;
    int sig;
     /* 当进行其它处理时,阻塞用户的中断. */
    sigfillset (&base_mask);
    sigaddset (&base_mask, SIGQUIT);
    sigaddset (&base_mask, SIGINT);
    if (sigprocmask (SIG_BLOCK, &base_mask, &oldmask)<0 )
        err_exit("SIG_BLOCK error");
    printf(" I can't stop to response signals. Please wait moment.\n");
    sleep(10);
     /* 过一会儿后,查看是否有悬挂信号. */
    printf("I am free now. Let me see if there is any pending signals.\n");
    sigpending (&waiting_mask);
    for ( sig=1;sig<NSIG;sig++)
        if (sigismember (&waiting_mask, sig)){ 
            psignal(sig,"there is a pending signal" );
             /* 对该信号做出回应... */
        }
     /* 恢复信号屏蔽,这将放开SIGINT和SIGTSTP */
    if (sigprocmask(SIG_SETMASK,&oldmask,NULL)<0)
        err_exit("SIG_SETMASK error");
    printf("Ther is no suspending signals. BYE!\n");    
    exit(EXIT_SUCCESS);
}