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This article mainly introduces how to use UDP in vxworks, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

UDP, whose full name should be User Datagram Protocol, is a connectionless transport layer protocol that provides unreliable fast delivery services. When communicating, we use Cramp S mode, that is, start a Server, which is responsible for blocking reception, and other Client sends data.

The specific process is as follows

Server calls socket () to open a Socket

Server calls bind () to specify information such as Port

Server calls recvfrom () to block reception

Client calls socket () to open a Socket

Client specifies information such as IP and Port of Server

Client calls sendto () to send data

The recvfrom () of Server received the data

Of course, Service can also call sendto (), Client can also call recvfrom ()

Socket is a kind of virtual IO. After the data is processed, both parties can call close () to close their Socket, and they can also use read () instead of recvfrom ().

The parameter domain of the socket () function uses AF_INET, the parameter type uses SOCK_DGRAM, and the parameter protocol is generally 0.

Several other functions and data structures are as follows. The type of function input parameters is sockaddr structure, while the declared variables usually use sockaddr_in structure to specify Port and IP. In fact, they are the same thing.

Client is as follows

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