linux - 处理SIGCHLD信号时子进程自动重启

Answer 1

I don’t quite understand. Accept just returns an EINTR error, which is just a normal function return. The parent process will continue to execute fork, but it is meaningless at this time because the value of connfd is definitely illegal (-1). The original book determines the value of connfd and has this code under accept:

if(errno == EINTR)
    continue;
else
    err_say("accept error");
    

This will stop it.