socket编程tcpudp两种模式笔记

tcp:   socket->connect->send/recv

         socket->bind->listen->accept->send/recv

udp:  socket->sendto/recvfrom

         socket->bind->sendto/recvfrom

 

 

sendto()函数原型为：

　　int sendto(int sockfd, const void *msg,int len,unsigned int flags,const struct sockaddr *to, int tolen);

Recvfrom()函数原型为：

　　int recvfrom(int sockfd,void *buf,int len,unsigned int flags,struct sockaddr *from,int *fromlen);