Socket Options

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Option affects socket operations, such as packet routing, the OOB data transmission, get and set getsockopt setsockopt socket options are used as follows:

int getsockopt（SOCKET s,int level,int optname,char* optval,int* optlen）;

int setsockopt(SOCKET s,int level,int optname,char* optval,int* optlen);

 

Each option sockets layer protocol There are different levels:

Application Layer: SOL_SOCKET

Transport Layer: IPPROTO_TCP go  IPPROTO_UDP

Network Layer: IPPROTO_IP

 

Blocking mode, you can call recvfrom designated port receives network packets in

If the packet is not to set socket options to set wait time

BOOL SetTimeout(SOCKET s,int nTime,BOOL bRecv)

{

　　int ret = ::setsockopt(s,SOL_SOCKET,

　　　　　　　　brecv?SO_RCVTIMEO:SO_SNDTIMEO,(char*)&nTime,sizeof(nTime));

}

Reproduced in: https: //my.oschina.net/u/204616/blog/545217