Process communication mode between different hosts -- socket

1. introduce

2.socket Concept

Socket It has “ Socket ” It means , stay Linux In the environment , A special file type used to represent inter process network communication . It is essentially formed by the kernel with the help of buffer Fake documents .
Since it's a document , So of course , We can use file descriptors to reference sockets . Similar to pipes ,Linux The purpose of the system encapsulating it into a file is to unify the interface , Make the operations of reading and writing sockets and reading and writing files consistent . The difference is that the pipeline is mainly used for local inter process communication , Sockets are mostly used for data transmission between network processes .

One-to-one correspondence , Pairs appear
It's a fake file
Full duplex communication

In network communication , Sockets must appear in pairs . The transmit buffer at one end corresponds to the receive buffer at the opposite end . We use the same file descriptor to retrieve the send buffer and receive buffer . Similar pipe .

A file descriptor operates on two buffers to send and receive data