异步清理子进程

当一个子进程结束后，Linux 给父进程发送SIGCHLD 信号，这个信号的默认处理方式是什么都不做。通过这一特点我们可以用获得子进程的退出信息，而且在用 wait(&status)  获得信息的时候，父进程还可以不用阻塞继续运行

 

 

#include<stdio.h>#include<string.h>#include<stdlib.h>#include<sys/types.h>#include<unistd.h>#include<signal.h>void clean_up_child_process(int signal_number){int status;wait(&status);printf("/nchild process exit with : %d/n",status);}int main(){pid_t id;int i=0,j=0;struct sigaction action;memset(&action, 0, sizeof(action));action.sa_handler = clean_up_child_process;sigaction(SIGCHLD, &action, NULL);id = fork();if(id > 0){while(i++ < 15){printf("father is running -----/n");sleep(1);}}else{while(j++ < 10){printf("/tchild runing .../n");sleep(1);}exit(0);}return 0;}