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https://github.com/Hizenberg469/Inter-Process-Communication-IPC-.git
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Unix Domain Socket
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24
AF_UNIX/CMakeLists.txt
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24
AF_UNIX/CMakeLists.txt
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# CMakeList.txt : CMake project for AF_UNIX, include source and define
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# project specific logic here.
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#
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cmake_minimum_required (VERSION 3.8)
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# Enable Hot Reload for MSVC compilers if supported.
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if (POLICY CMP0141)
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cmake_policy(SET CMP0141 NEW)
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set(CMAKE_MSVC_DEBUG_INFORMATION_FORMAT "$<IF:$<AND:$<C_COMPILER_ID:MSVC>,$<CXX_COMPILER_ID:MSVC>>,$<$<CONFIG:Debug,RelWithDebInfo>:EditAndContinue>,$<$<CONFIG:Debug,RelWithDebInfo>:ProgramDatabase>>")
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endif()
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project ( AF_UNIX VERSION 1.0.0 LANGUAGES C CXX)
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set(CMAKE_C_STANDARD 17)
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set(CMAKE_C_STANDARD_REQUIRED ON)
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set(CMAKE_C_EXTENSIONS OFF)
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# Add source to this project's executable.
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add_executable (server "server.c")
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add_executable (client "client.c")
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# TODO: Add tests and install targets if needed.
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101
AF_UNIX/CMakePresets.json
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101
AF_UNIX/CMakePresets.json
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{
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"version": 3,
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"configurePresets": [
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{
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"name": "windows-base",
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"hidden": true,
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"generator": "Ninja",
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"binaryDir": "${sourceDir}/out/build/${presetName}",
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"installDir": "${sourceDir}/out/install/${presetName}",
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"cacheVariables": {
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"CMAKE_C_COMPILER": "cl.exe",
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"CMAKE_CXX_COMPILER": "cl.exe"
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},
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"condition": {
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"type": "equals",
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"lhs": "${hostSystemName}",
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"rhs": "Windows"
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}
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},
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{
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"name": "x64-debug",
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"displayName": "x64 Debug",
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"inherits": "windows-base",
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"architecture": {
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"value": "x64",
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"strategy": "external"
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},
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"cacheVariables": {
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"CMAKE_BUILD_TYPE": "Debug"
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}
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},
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{
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"name": "x64-release",
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"displayName": "x64 Release",
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"inherits": "x64-debug",
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"cacheVariables": {
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"CMAKE_BUILD_TYPE": "Release"
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}
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},
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{
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"name": "x86-debug",
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"displayName": "x86 Debug",
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"inherits": "windows-base",
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"architecture": {
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"value": "x86",
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"strategy": "external"
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},
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"cacheVariables": {
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"CMAKE_BUILD_TYPE": "Debug"
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}
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},
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{
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"name": "x86-release",
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"displayName": "x86 Release",
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"inherits": "x86-debug",
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"cacheVariables": {
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"CMAKE_BUILD_TYPE": "Release"
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}
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},
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{
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"name": "linux-debug",
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"displayName": "Linux Debug",
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"generator": "Ninja",
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"binaryDir": "${sourceDir}/out/build/${presetName}",
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"installDir": "${sourceDir}/out/install/${presetName}",
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"cacheVariables": {
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"CMAKE_BUILD_TYPE": "Debug"
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},
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"condition": {
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"type": "equals",
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"lhs": "${hostSystemName}",
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"rhs": "Linux"
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},
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"vendor": {
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"microsoft.com/VisualStudioRemoteSettings/CMake/1.0": {
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"sourceDir": "$env{HOME}/.vs/$ms{projectDirName}"
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}
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}
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},
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{
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"name": "macos-debug",
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"displayName": "macOS Debug",
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"generator": "Ninja",
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"binaryDir": "${sourceDir}/out/build/${presetName}",
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"installDir": "${sourceDir}/out/install/${presetName}",
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"cacheVariables": {
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"CMAKE_BUILD_TYPE": "Debug"
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},
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"condition": {
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"type": "equals",
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"lhs": "${hostSystemName}",
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"rhs": "Darwin"
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},
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"vendor": {
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"microsoft.com/VisualStudioRemoteSettings/CMake/1.0": {
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"sourceDir": "$env{HOME}/.vs/$ms{projectDirName}"
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}
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}
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}
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]
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}
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88
AF_UNIX/client.c
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88
AF_UNIX/client.c
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#include <error.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#define SOCKET_NAME "/tmp/DemoSocket"
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#define BUFFER_SIZE 128
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int
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main(int argc, char* argv[]) {
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struct sockaddr_un addr;
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int i;
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int ret;
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int data_socket;
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char buffer[BUFFER_SIZE];
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/* Create data socket */
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/* Client side don't have any concept of Master socket.
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It directly use data socket to communicate with server. */
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data_socket = socket(AF_UNIX, SOCK_STREAM, 0);
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if (data_socket == -1) {
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perror("socket");
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exit(EXIT_FAILURE);
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}
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/*
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For portability clear the whole structure, since some implementation
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have additional (nonstandard) fields in the structure.
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*/
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memset(&addr, 0, sizeof(struct sockaddr_un));
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/* Connect socket to socket address. */
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addr.sun_family = AF_UNIX;
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strncpy(addr.sun_path, SOCKET_NAME, sizeof(addr.sun_path) - 1);
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ret = connect(data_socket, (const struct sockaddr*)&addr,
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sizeof(struct sockaddr_un));
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if (ret == -1) {
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fprintf(stderr, "The server is down.\n");
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exit(EXIT_FAILURE);
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}
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/* Send arguments */
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do {
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printf("Enter number to send to server :\n");
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scanf("%d", &i);
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ret = write(data_socket, &i, sizeof(int));
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if (ret == -1) {
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perror("write");
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exit(EXIT_FAILURE);
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}
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printf("No of bytes sent = %d, data sent = %d\n", ret, i);
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} while (i);
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/* Request result */
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memset(buffer, 0, BUFFER_SIZE);
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strncpy(buffer, "RES", strlen("RES"));
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buffer[strlen(buffer)] = '\0';
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ret = read(data_socket, buffer, BUFFER_SIZE);
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if (ret == -1) {
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perror("read");
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exit(EXIT_FAILURE);
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}
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/* Ensure buffer is 0 - terminated */
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buffer[BUFFER_SIZE - 1] = 0;
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printf("%s\n", buffer);
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/* Close socket */
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close(data_socket);
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exit(EXIT_SUCCESS);
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return 0;
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}
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178
AF_UNIX/server.c
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178
AF_UNIX/server.c
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@@ -0,0 +1,178 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#define SOCKET_NAME "/tmp/DemoSocket" /* Unique name of the socket */
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#define BUFFER_SIZE 128 /* Size of the buffer which will be used by
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for Communication. */
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int
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main(int argc, char* argv[]) {
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/* Structure provided by Unix library for using
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it as an identifier for managing the socket */
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struct sockaddr_un name;
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#if 0
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struct sockaddr_un {
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/* This member describe what type of data it
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will handle. Define the family of the
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socket. Here, we are using UNIX DOMAIN socket
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so AF_UNIX constant should be used for
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classification. */
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sa_family_t sun_family; /* AF_UNIX */
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/* Hold the name of the socket with the path where it
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is created. */
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char sun_path[108]; /* pathname */
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};
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#endif
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int ret;
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int connection_socket;
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int data_socket;
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int result;
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int data;
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char buffer[BUFFER_SIZE];
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/* In case the program exited inadvertently on the last run,
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remove the socket. */
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unlink(SOCKET_NAME);
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/* Create Master socket */
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/* SOCK_DGRAM for Datagram based communication */
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connection_socket = socket(AF_UNIX, SOCK_STREAM, 0);
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if (connection_socket == -1) {
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perror("socket");
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exit(EXIT_FAILURE);
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}
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printf("Master socket created\n");
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/* initialize */
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memset(&name, 0, sizeof(struct sockaddr_un));
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/* Specify the socket Cridentials */
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name.sun_family = AF_UNIX;
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strncpy(name.sun_path, SOCKET_NAME, sizeof(name.sun_path) - 1);
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/* Bind Socket to socket name. */
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/* Purpose of bind() system call is that application() dictate the underlying
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operating system the criteria of receiving the data. Here, bind() system call
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is telling the OS that if sender process sends the data destined to socket
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"tmp/DemoSocket", then such data needs to be delievered to this server process
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( the server process ) */
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ret = bind(connection_socket, (const struct sockaddr* )&name,
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sizeof(struct sockaddr_un));
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if (ret == -1) {
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perror("bind");
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exit(EXIT_FAILURE);
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}
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printf("bind() call succeed\n");
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/* Prepare for accepting connections. The backlog size is set to 20.
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So, while one request is being processed other requests can be
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waiting.
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*/
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ret = listen(connection_socket, 20);
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if (ret == -1) {
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perror("listen");
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exit(EXIT_FAILURE);
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}
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/* This is the main loop for handling connections. */
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/* All Server process usually runs 24 x 7. Good Servers should always up
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running and should never go down. */
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for (;;) {
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/* Wait for incoming connection. */
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printf("Waiting on accept() sys call\n");
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data_socket = accept(connection_socket, NULL, NULL);
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if (data_socket == -1) {
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perror("accept");
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exit(EXIT_FAILURE);
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}
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printf("Connection accepted from client\n");
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result = 0;
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for (;;) {
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/* Prepare the buffer to recv the data*/
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memset(buffer, 0, BUFFER_SIZE);
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/*Wait for next data packet. */
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/* Server is blocked here. Waiting for the data to arrive from client
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'read' is a blocking system call. */
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printf("Waiting for data from the client\n");
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ret = read(data_socket, buffer, BUFFER_SIZE);
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if (ret == -1) {
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perror("read");
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exit(EXIT_FAILURE);
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}
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/* Add received summand */
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memcpy(&data, buffer, sizeof(int));
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if (data == 0) break;
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result += data;
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}
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/* Send result. */
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memset(buffer, 0, BUFFER_SIZE);
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sprintf(buffer, "Result = %d", result);
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printf("Sending final result back to client\n");
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/* non-blockding system call */
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ret = write(data_socket, buffer, BUFFER_SIZE);
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if (ret == -1) {
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perror("write");
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exit(EXIT_FAILURE);
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}
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/*close socket*/
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close(data_socket);
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}
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/*close the master socket*/
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close(connection_socket);
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printf("connection closed..\n");
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/* Server should release resources before getting terminated.
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Unlink the socket. */
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unlink(SOCKET_NAME);
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exit(EXIT_SUCCESS);
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return 0;
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}
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