Lectures notes for 2010 - KTH

Socket API
• int socket(int domain, int type, int protocol);
• creates an endpoint description that you can use to send and receive network traffic
• int bind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen);
• binds a socket to the local address and port: my_address
• int connect(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen);
• connect the local socket to a remote socket
• int listen(int s, int backlog);
• indicates that socket is willing to accept connections & limites the queue of pending
connections
• int accept(int s, struct sockaddr *addr, socklen_t *addrlen);
• accepted the first connection request from the queue and connects it to the socket
• connection oriented sending and receiving:
• ssize_t send(int s, const void *buf, size_t len, int flags);
• ssize_t recv(int s, void *buf, size_t len, int flags);
• datagram sending and receiving:
• ssize_t sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen);
• ssize_t recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen);
• int close(int fd) and int shutdown(int s, int how) - end it all!
Maguire Socket API 4: 18 of 74
maguire@kth.se 2010.03.21 Internetworking/Internetteknik