利用sigaction回收多个子进程

SIGCHLD触发sigaction，进入回调函数，回收子进程

#include 
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#include 

void sig_catch(int signo){
	pid_t wid;
	int stat;
	while((wid = waitpid(-1, &stat, 0)) != -1){//循环回收，防止僵尸进程
		if(WIFEXITED(stat)){
			printf("wait : %d childn", wid);
		}
	}
}

int main(int argc, char *argv[])
{
	struct sigaction act;
	act.sa_handler = sig_catch;  //回调函数
	sigemptyset(&(act.sa_mask)); //回调时的屏蔽字
	act.sa_flags = 0;            //默认屏蔽触发act的信号
	
	sigaction(SIGCHLD, &act, NULL);
	
	int i;
	for(i = 0; i < 10; ++i){
		if(fork() == 0){
			break;
		}
	}
	if(i == 10){
		sleep(1);
		printf("Daddy donen");
	} else{
		printf("%d child donen", getpid());
	}
	return 0;
}