再次,我需要你的内核模块的帮助。我已经实现了一个客户端模块,但每次连接函数都返回errno = 110(超时)。我不明白为什么?为了测试这个模块,我在监听模式下启动了netcat(nc -vl -p4242)。你对这个神秘的错误有任何建议吗
int init_module(void)
{
struct socket* sock = NULL;
struct sockaddr_in* dest = {0};
int retVal = 0;
dest = (struct sockaddr_in*)kmalloc(sizeof(struct sockaddr_in), GFP_KERNEL);
sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
dest->sin_family = AF_INET;
dest->sin_addr.s_addr = htonl(in_aton("127.0.0.1"));
dest->sin_port = htons(4242);
printk(KERN_EMERG "Connect to %X:%u\n", dest->sin_addr.s_addr, 4242);
retVal = sock->ops->connect(sock, (struct sockaddr*)dest, sizeof(struct sockaddr_in), !O_NONBLOCK);
if (retVal >= 0) {
printk(KERN_EMERG "Connected\n");
sock_release(sock);
}
else
printk(KERN_EMERG "Error %d\n", -retVal);
return (0);
}
调试输出(dmesg)
Message from syslogd@century at Sun Jun 19 08:41:33 2011 ...
century kernel: Connect to 7F000001:4242
Message from syslogd@century at Sun Jun 19 08:41:54 2011 ...
century kernel: Error 110
错误代码110是“超时”。
答案 0 :(得分:5)
in_aton("127.0.0.1");
已经按网络字节顺序给出了地址。
通过执行htonl(in_aton("127.0.0.1"));
,您实际上正在尝试连接到1.0.0.127