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This article mainly introduces how to use C language to achieve local socke communication, 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.

I. Overview

Communication between processes can be achieved by using local socket communication.

The related functions are described as follows:

Int socket (int domain, int type, int protocol); function description: create local socket function parameters: domain: AF_UNIX or AF_LOCAL type: SOCK_STREAM or SOCK_DGRAM protocol: 0: use default protocol function return value: success: return file descriptor. Failure: return-1 and set the errno value. After the socket is created successfully, a buffer will be created in the kernel. The following figure shows the client and server kernel buffer diagram .int bind (int sockfd, const struct sockaddr * addr, socklen_t addrlen); function description: bind socket function parameter: socket: file descriptor returned by the socket function addr: local address addlen: local address length function return value: success: return file descriptor. Failure: return-1 and set the errno value. It should be noted that the bind function automatically creates the socket file. If the socket file already exists before calling the bind function, calling bind will report an error. You can use the unlink function to delete the file before bind. Struct sockaddr_un {sa_family_t sun_family; / * AF_UNIX or AF_LOCAL*/ char sun_path [108]; / * pathname * /}

The overall usage steps are similar to the socket for network communication, as shown below:

Tcp local socket server process: create socket socket (AF_UNIX,SOCK_STREAM,0) bind struct sockaddr_un & force listen listen to get new connection accept loop communication read-write close file descriptor closetcp local socket client flow: call socket create socket call bind function to bind socket file description and socket file. It is not necessary, if there is no display binding, it will be implicitly bound, but the server does not know who is connected. Call the connect function to connect the server-side circular communication read-write close the file descriptor close II. Code example

1. Server code example

/ / Local socket communication server # include # include int main () {/ / create socket int lfd = socket (AF_UNIX,SOCK_STREAM,0); if (lfd

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