怎么建立类似百度问答的网站,做电影网站有什么好处和坏处,seo对于电子商务网站推广的作用,网页设计与制作课程评价UNIX域套接字(UNIX domain socket)为我们提供了一种在进程之间建立通信通道的便捷方法#xff0c;具有许多有用的内置功能。它支持面向流(TCP)和面向数据报(UDP)协议作为TCP/IP互联网套接字。我们还可以在阻塞和非阻塞模式之间进行选择。 首先需要创建套接字并在套接字函… UNIX域套接字(UNIX domain socket)为我们提供了一种在进程之间建立通信通道的便捷方法具有许多有用的内置功能。它支持面向流(TCP)和面向数据报(UDP)协议作为TCP/IP互联网套接字。我们还可以在阻塞和非阻塞模式之间进行选择。 首先需要创建套接字并在套接字函数中指定AF_UNIX作为域套接字。创建套接字后必须使用绑定函数将套接字绑定到唯一的文件路径。与AF_INET域中的Internet套接字绑定到唯一的IP地址和端口号不同UNIX域套接字绑定到文件路径。文件系统中创建的此文件当程序关闭且不再需要该文件时你必须手动将其删除。 UNIX域套接字与server/client网络套接字通信没有太大不同但它旨在供本地文件系统使用。server/client网络套接字介绍参考https://blog.csdn.net/fengbingchun/article/details/107848160 UNIX域套接字总结 (1).同步 (2).极高的吞吐量存储设备速度限制 (3).双向通信 (4).以线性方式读写 (5).自动内存管理。 注以上内容主要来自网络整理。 测试代码如下
#include unistd.h
#include stdlib.h
#include sys/socket.h
#include sys/un.h
#include sys/wait.h
#include string.h
#include errno.h
#include iostreamint main()
{// reference: https://biendltb.github.io/tech/inter-process-communication-ipc-in-cpp/const char* server_sock_path /tmp/unix_sock.server;const char* client_sock_path /tmp/unix_sock.client;pid_t pid fork(); // create two processes of client and serverif (pid 0) {fprintf(stderr, fail to fork\n);return -1;}if (pid ! 0) { // server process(parent process)auto server_sock socket(AF_UNIX, SOCK_STREAM, 0); // open the server socket with the SOCK_STREAM typeif (server_sock -1) {fprintf(stderr, SERVER: fail to socket: %s\n, strerror(errno));exit(1);}// bind to an address on file system// similar to other IPC methods, domain socket needs to bind to a file system, so that client know the address of the server to connect tostruct sockaddr_un server_addr;memset(server_addr, 0, sizeof(server_addr));server_addr.sun_family AF_UNIX;strcpy(server_addr.sun_path, server_sock_path);unlink(server_sock_path); // unlink the file before bind, unless it cant bind: error info: Address already in useauto rc bind(server_sock, (struct sockaddr *)server_addr, sizeof(server_addr));if (rc -1) {fprintf(stderr, SERVER: fail to bind: %s\n, strerror(errno));exit(1);}// listen and accept client connection// set the server in the listen mode and maximum pending connected clients in queuerc listen(server_sock, 10);if (rc -1) {fprintf(stderr, SERVER: fail to listen: %s\n, strerror(errno));exit(1);}fprintf(stdout, SERVER: Socket listening...\n);struct sockaddr_un client_addr;auto len sizeof(client_addr);int client_fd accept(server_sock, (struct sockaddr *)client_addr, (socklen_t*)len);if (client_fd -1) {fprintf(stderr, SERVER: fail to accept: %s\n, strerror(errno));exit(1);}fprintf(stdout, SERVER: Connected to client at: %s\n, client_addr.sun_path);fprintf(stdout, SERVER: Wating for message...\n);const int buf_len 256;char buf[buf_len];memset(buf, 0, buf_len);int byte_recv recv(client_fd, buf, buf_len, 0);if (byte_recv -1) {fprintf(stderr, SERVER: fail to recv: %s\n, strerror(errno));exit(1);}elsefprintf(stdout, SERVER: Server received message: %s.\n, buf);fprintf(stdout, SERVER: Respond to the client...\n);memset(buf, 0, buf_len);strcpy(buf, hello from server);rc send(client_fd, buf, buf_len, 0);if (rc -1) {fprintf(stderr, SERVER: fail to send:%s\n, strerror(errno));exit(1);}fprintf(stdout, SERVER: Done!\n);close(server_sock);close(client_fd);remove(server_sock_path); // remove access to a file namedint status;auto pid2 wait(status); // system call suspends execution of the calling thread until one of its children terminatesfprintf(stdout, process ID of the terminated child: %d\n, pid2);if (WIFEXITED(status)) { // returns true if the child terminated normallyfprintf(stdout, child process ended with: exit(%d)\n, WEXITSTATUS(status));}if (WIFSIGNALED(status)) { // returns true if the child process was terminated by a signalfprintf(stderr, child process ended with: kill -%d\n, WTERMSIG(status));}}if (pid 0) { // client process(child process)int client_sock socket(AF_UNIX, SOCK_STREAM, 0);if (client_sock -1) {fprintf(stderr, CLIENT: fail to socket: %s\n, strerror(errno));exit(1);}// bind client to an address on file system// Note: this binding could be skip if we want only send data to server without receivingstruct sockaddr_un client_addr;memset(client_addr, 0, sizeof(client_addr));client_addr.sun_family AF_UNIX;strcpy(client_addr.sun_path, client_sock_path);unlink (client_sock_path);auto rc bind(client_sock, (struct sockaddr *)client_addr, sizeof(client_addr));if (rc -1) {fprintf(stderr, CLIENT: fail to bind: %s\n, strerror(errno));exit(1);}// Set server address and connect to itstruct sockaddr_un server_addr;server_addr.sun_family AF_UNIX;strcpy(server_addr.sun_path, server_sock_path);rc connect(client_sock, (struct sockaddr*)server_addr, sizeof(server_addr));if (rc -1) {fprintf(stderr, CLIENT: fail to connect: %s\n, strerror(errno));exit(1);}fprintf(stdout, CLIENT: Connected to server.\n);// Send message to serverconst int buf_len 256;char buf[buf_len];memset(buf, 0, buf_len);strcpy(buf, hello from client);rc send(client_sock, buf, buf_len, 0);if (rc -1) {fprintf(stderr, CLIENT: fail to send: %s\n, strerror(errno));exit(1);}fprintf(stdout, CLIENT: Sent a message to server.\n);fprintf(stdout, CLIENT: Wait for respond from server...\n);memset(buf, 0, buf_len);rc recv(client_sock, buf, buf_len, 0);if (rc -1) {fprintf(stderr, CLIENT: fail to recv: %s\n, strerror(errno));exit(1);}elsefprintf(stdout, CLIENT: Message received: %s\n, buf);fprintf(stdout, CLIENT: Done!\n);close(client_sock);remove(client_sock_path);exit(0);}fprintf(stdout, test finish \n);return 0;
} 编译脚本build.sh如下
#! /bin/bashif [ -d build ]; thenecho build directory already exists, it does not need to be created again
elsemkdir -p build
ficd build
cmake ..
makerc$?
if [[ ${rc} ! 0 ]];thenecho #### ERROR: please check ####exit ${rc}
fiecho build finish CMakeLists.txt内容如下
cmake_minimum_required(VERSION 3.22)
project(samples_multi_process)set(CMAKE_BUILD_TYPE Release) # only works under linux
set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} -Wall -O2 -stdc17)file(GLOB samples ${PROJECT_SOURCE_DIR}/test_*.cpp)
#message(STATUS samples: ${samples})foreach(sample ${samples})string(REGEX MATCH [^/]$ name ${sample})string(REPLACE .cpp exec_name ${name})#message(STATUS exec name: ${exec_name})add_executable(${exec_name} ${sample})target_link_libraries(${exec_name} rt)
endforeach() 执行结果如下所示 GitHubhttps://github.com/fengbingchun/Linux_Code_Test
