Nginx杂谈

建立 管道通信的时候，使用AF_UNIX提高网络传送速度

    if (respawn != NGX_PROCESS_DETACHED) {

        /* Solaris 9 still has no AF_LOCAL */

//        if (socketpair(AF_UNIX, SOCK_STREAM, 0, ngx_processes[s].channel) == -1) //建立父子进程通信的管道
//        {
//            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
//                          "socketpair() failed while spawning \"%s\"", name);
//            return NGX_INVALID_PID;
//        }


accept4 设置套接口
     //开始accept句柄
#if (NGX_HAVE_ACCEPT4)
        if (use_accept4) {
            s = accept4(lc->fd, (struct sockaddr *) sa, &socklen,
                        SOCK_NONBLOCK);
        } else {
            s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
        }
#else
        s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
#endif