1,接受信号

void handler(int num){

printf("recv num%d\n",num);

}

int main(void){

int n =10;

printf("main ....begin\n");

signal(SIGINT,handler);

do{

n=sleep(n);

}while(n>0);

printf("sleep...结束\n");

return 0;

}

1,sigaction 带返回值的信号处理函数

void handler(int sig){

if(sig == SIGINT){

printf("recv a sig=%d\n",sig);

printf("\n\n\n");

}else if(sig == SIGQUIT){

sigset_t uset;

sigemptyset(&uset);

sigaddset(&uset,SIGINT);

sigprocmask(SIG_UNBLOCK,&uset,NULL);

}}

int main(int argc,char *argv[]){

struct sigaction act;

struct sigaction

act.sa_handler = handler;

sigaction(SIGINT,&act,NULL);

for(;;){

//printsigset(&pset);

sleep(1);

}return 0;}