#Windows socket library portable#

#Windows socket library portable#

The easy to use and portable SuperCom API enables fast implementation of TCP/IP applications. And your application can perform anything it should be doing instead of waiting idle or even blocking.Д®vent Driven Data Communication with SuperCom can be more advantageous ensuring a smooth working application even with multiple concurrent connections. If required, SuperCom will simply inform your application when data is available, a new connection is established, a connection is closed, network loss etc. With SuperCom there is no need to: continuous poll for data, check if your connection is closed, check if new connection established (client & server), network down/up, etc. Hence, the SuperCom for TCP/IP library enables building solid high performance Client / Server applications with high data throughput. This efficient Data Communication Engine provides maximum functionality, reduced CPU load and low resource consumption. The SuperCom for TCP/IP data communication library provides an optimized Data Communication Engine, which handles concurrent connections and event driven data communication. Here we are exchanging one hello message between server and client to demonstrate the client/server model.The SuperCom for TCP/IP data communication library handles data communication over TCP/IP networks (internet and intranet). ServerвЂ™s address and port is specified in addr. The connect() system call connects the socket referred to by the file descriptor sockfd to the address specified by addr.

Connect: int connect(int sockfd, const struct sockaddr *addr,.

Socket connection: Exactly same as that of serverвЂ™s socket creation.

At this point, connection is established between client and server, and they are ready to transfer data. It extracts the first connection request on the queue of pending connections for the listening socket, sockfd, creates a new connected socket, and returns a new file descriptor referring to that socket.

Accept: int new_socket= accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen).

If a connection request arrives when the queue is full, the client may receive an error with an indication of ECONNREFUSED. The backlog, defines the maximum length to which the queue of pending connections for sockfd may grow. It puts the server socket in a passive mode, where it waits for the client to approach the server to make a connection.

Listen: int listen(int sockfd, int backlog).

In the example code, we bind the server to the localhost, hence we use INADDR_ANY to specify the IP address.

Bind: int bind(int sockfd, const struct sockaddr *addr,ДЄfter creation of the socket, bind function binds the socket to the address and port number specified in addr(custom data structure).

Prevents error such as: вЂњaddress already in useвЂќ. This is completely optional, but it helps in reuse of address and port. This helps in manipulating options for the socket referred by the file descriptor sockfd.

Setsockopt: int setsockopt(int sockfd, int level, int optname,.

This is the same number which appears on protocol field in the IP header of a packet.(man protocols for more details) Protocol: Protocol value for Internet Protocol(IP), which is 0. SOCK_DGRAM: UDP(unreliable, connectionless) SOCK_STREAM: TCP(reliable, connection oriented) Sockfd: socket descriptor, an integer (like a file-handle)Дomain: integer, communication domain e.g., AF_INET (IPv4 protocol), AF_INET6 (IPv6 protocol)

Socket creation: int sockfd = socket(domain, type, protocol).

State diagram for server and client model Server forms the listener socket while client reaches out to the server. One socket(node) listens on a particular port at an IP, while other socket reaches out to the other to form a connection.

Socket programming is a way of connecting two nodes on a network to communicate with each other.