setsockopt 返回错误 10014
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【中文标题】setsockopt 返回错误 10014【英文标题】:setsockopt returning error 10014 【发布时间】:2014-03-04 01:13:25 【问题描述】:我正在尝试编写一个简单的 UDP 服务器,它在多播组上通告其服务端口,但我无法让多播工作。我尝试查看 Microsoft 文档并复制/粘贴了他们的一些代码,但它不起作用。这是有问题的代码:
this->port = srvc_port; //11129 in my example
this->mcast_port = mcast_port; //11130 in my example
this->mcast_ip = mcast_ip; //230.0.0.30 in my example
int iResult = WSAStartup(MAKEWORD(2,2), &service_wsaData);
if (iResult != NO_ERROR)
cout << "WSAstartup failed" << endl;
return -1;
service_sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (service_sock == INVALID_SOCKET)
closesocket(service_sock);
WSACleanup();
cout << "Error at socket" << endl;
return -1;
mcast_sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(mcast_sock == INVALID_SOCKET)
closesocket(mcast_sock);
WSACleanup();
cout << "Error at socket" << endl;
return -1;
multicast.sin_family = AF_INET; // multicast is a sockaddr_in struct
multicast.sin_addr.s_addr = INADDR_ANY;
multicast.sin_port = htons(mcast_port);
service.sin_family = AF_INET; //same for service
service.sin_addr.s_addr = INADDR_ANY;
service.sin_port = htons(port);
if(::bind( service_sock, (sockaddr *)&service, sizeof(service) ) == SOCKET_ERROR)
closesocket(mcast_sock);
closesocket(service_sock);
WSACleanup();
cout << "Error binding service socket" << endl;
return -1;
;
if(::bind( mcast_sock, (sockaddr *)&multicast, sizeof(multicast) ) == SOCKET_ERROR)
closesocket(mcast_sock);
closesocket(service_sock);
WSACleanup();
cout << "Error binding multicast socket" << endl;
return -1;
;
mreq.imr_multiaddr.s_addr = inet_addr(mcast_ip.c_str()); //mreq is declared like so "struct ip_mreq mreq;" in the class
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
if(setsockopt(mcast_sock,IPPROTO_IP,IP_ADD_SOURCE_MEMBERSHIP,(char *) &mreq, sizeof(mreq)) == SOCKET_ERROR)
//I get error 10014 here
cout << "Error: " << WSAGetLastError() << endl;
return -1;
任何帮助将不胜感激。
【问题讨论】:
好吧,文档说 10014 表示地址错误。我们从您的mreq
变量及其初始化中看不到太多,在这里您只初始化 3 个成员中的 2 个。在套接字编程的情况下,通过将这些结构的初始化设置为零也是明智的。
【参考方案1】:
10014是WSAEFAULT
,表示“optval参数指向的缓冲区不在进程地址空间的有效部分或者optlen参数太小。”
阅读文档:
IPPROTO_IP Socket Options
IP_ADD_SOURCE_MEMBERSHIP
需要一个指向 ip_mreq_source
结构的指针:
typedef struct ip_mreq_source
struct in_addr imr_multiaddr;
struct in_addr imr_sourceaddr;
struct in_addr imr_interface;
IP_MREQ_SOURCE, *PIP_MREQ_SOURCE;
您正在向它传递一个指向 ip_mreq
结构的指针:
typedef struct ip_mreq
struct in_addr imr_multiaddr;
struct in_addr imr_interface;
IP_MREQ, *PIP_MREQ;
ip_mreq
小于ip_mreq_source
,因此sizeof(mreq)
对于IP_ADD_SOURCE_MEMBERSHIP
来说太小了。您需要将您的mreq
变量更改为ip_mreq_source
,并确保填写其imr_sourceaddr
成员。
ip_mreq
用于IP_ADD_MEMBERSHIP
和IP_DROP_MEMBERSHIP
。
ip_mreq_source
用于IP_ADD_SOURCE_MEMBERSHIP
、IP_DROP_SOURCE_MEMBERSHIP
、IP_BLOCK_SOURCE
和 IP_UNBLOCK_SOURCE
。
【讨论】:
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