主要注意流程:
STREAM SOCKET:
Server : socket() ---> bind() ---> listen() ---> accept()
Client: scoket() ---> connect()
参考文章一篇就够: http://troydhanson.github.io/misc/Unix_domain_sockets.html
自己写的 一个 Server 和 一个Client:
//Server // // unix_domain_server.c // UnixDomainServer // // Created by gtliu on 7/11/13. // Copyright (c) 2013 GT. All rights reserved. // #include "MITLogModule.h" #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <stddef.h> #include <unistd.h> #include <sys/socket.h> #include <sys/un.h> #define FUNC_FAIL -1 #define FUNC_SUCCESS 0 #define SOCKADDR_UN_SUN_PATH_MAX_LEN 103 // 104 - 1 #define SER_ACCEPT_CON_NUM 1 /** * Create a server endpoint of a connection. * * @param scok_path: the unix domain socket path * @return return the file descirption if all ok, <0 on err */ int create_serv_listen(const char *sock_path) { size_t path_len = strlen(sock_path); if (path_len == 0) { MITLogWrite(MITLOG_LEVEL_ERROR, "socket path can't be empty"); return FUNC_FAIL; } else if (path_len > SOCKADDR_UN_SUN_PATH_MAX_LEN) { MITLogWrite(MITLOG_LEVEL_ERROR, "socket path length must less than%d", SOCKADDR_UN_SUN_PATH_MAX_LEN); return FUNC_FAIL; } int fd = 0, size = 0; struct sockaddr_un server_un; memset(&server_un, 0, sizeof(server_un)); server_un.sun_family = AF_UNIX; strncpy(server_un.sun_path, sock_path, sizeof(server_un.sun_path) - 1); if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { MITLogWrite(MITLOG_LEVEL_ERROR, "socket() faild:%s", strerror(errno)); return FUNC_FAIL; } /* in case it already exists */ unlink(sock_path); size = offsetof(struct sockaddr_un, sun_path) + strlen(server_un.sun_path); if (bind(fd, (struct sockaddr *)&server_un, size) < 0) { MITLogWrite(MITLOG_LEVEL_ERROR, "bind() failed:%s", strerror(errno)); close(fd); return FUNC_FAIL; } if (listen(fd, 0) < 0) { MITLogWrite(MITLOG_LEVEL_ERROR, "listen() failed:%s", strerror(errno)); close(fd); return FUNC_FAIL; } return fd; } /** * Accept a client's connection and return the relative file descriptor. * * @param listen_fd: the server socket file descriptor * @return return the file descirption if all ok, <0 on err */ int serv_accept(int listen_fd) { int child_fd = 0, len = 0; struct sockaddr_un income_un; len = sizeof(income_un); if ((child_fd = accept(listen_fd, (struct sockaddr *)&income_un, &len)) < 0) { MITLogWrite(MITLOG_LEVEL_ERROR, "accept() failed:%s", strerror(errno)); /* often errno=EINTR, if signal caught */ return FUNC_FAIL; } return child_fd; } int main(int argc, const char * argv[]) { MITLogOpen("unix_domain_server"); char *sock_path = "/tmp/domain_socket_one"; if (argc > 1) { sock_path = (char *) argv[1]; } MITLogWrite(MITLOG_LEVEL_COMMON, "Starting the server..."); int listen_fd = create_serv_listen(sock_path); if (listen_fd == FUNC_FAIL) { return FUNC_FAIL; } MITLogWrite(MITLOG_LEVEL_COMMON, "Wait for the client... listen_fd:%d", listen_fd); int child_fd = serv_accept(listen_fd); if (child_fd == FUNC_FAIL) { close(listen_fd); return FUNC_FAIL; } char recv_buffer[1024] = {0}; while (1) { MITLogWrite(MITLOG_LEVEL_COMMON, "Wait for the message..."); if(read(child_fd, recv_buffer, sizeof(recv_buffer) - 1) > 0) { printf("Recieve message:%s ", recv_buffer); } sleep(2); } MITLogClose(); return 0; }
//Client // // main.c // UnixDomainClient // // Created by gtliu on 7/11/13. // Copyright (c) 2013 GT. All rights reserved. // #include "MITLogModule.h" #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <stddef.h> #include <unistd.h> #include <sys/socket.h> #include <sys/un.h> #include <sys/stat.h> #define FUNC_FAIL -1 #define FUNC_SUCCESS 0 #define SOCKADDR_UN_SUN_PATH_MAX_LEN 103 // 104 - 1 #define SER_ACCEPT_CON_NUM 1 /** * Create a server endpoint of a connection. * * @param scok_path: the unix domain socket path * @return return the file descirption if all ok, <0 on err */ int client_connection(const char *sock_path) { size_t path_len = strlen(sock_path); if (path_len == 0) { MITLogWrite(MITLOG_LEVEL_ERROR, "socket path can't be empty"); return FUNC_FAIL; } else if (path_len > SOCKADDR_UN_SUN_PATH_MAX_LEN) { MITLogWrite(MITLOG_LEVEL_ERROR, "socket path length must less than%d", SOCKADDR_UN_SUN_PATH_MAX_LEN); return FUNC_FAIL; } int fd = 0, len = 0; if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { MITLogWrite(MITLOG_LEVEL_ERROR, "socket() faild:%s", strerror(errno)); return FUNC_FAIL; } struct sockaddr_un client_un; memset(&client_un, 0, sizeof(client_un)); client_un.sun_family = AF_UNIX; strncpy(client_un.sun_path, sock_path, sizeof(client_un.sun_path) - 1); len = offsetof(struct sockaddr_un, sun_path) + strlen(client_un.sun_path); if ((connect(fd, (struct sockaddr *)&client_un, len)) < 0) { MITLogWrite(MITLOG_LEVEL_ERROR, "connect() failed:%s", strerror(errno)); close(fd); return FUNC_FAIL; } return fd; } int main(int argc, const char * argv[]) { MITLogOpen("unix_domain_client"); char *sock_path = "/tmp/domain_socket_one"; if (argc > 1) { sock_path = (char *) argv[1]; } MITLogWrite(MITLOG_LEVEL_COMMON, "Starting the client..."); int client_fd = client_connection(sock_path); if (client_fd == FUNC_FAIL) { return FUNC_FAIL; } for (int i=1; i < 100; ++i) { MITLogWrite(MITLOG_LEVEL_COMMON, "Send message to server..."); char msg[256] = {0}; sprintf(msg, "client message :%d", i); if(write(client_fd, msg, strlen(msg)) > 0) { MITLogWrite(MITLOG_LEVEL_COMMON, "Send message :%d success", i); } sleep(2); } MITLogClose(); return 0; }