/*********************************************************************************
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* Copyright: (C) 2025 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: usocket_server.c
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* Description: This file unix domain socker server example program.
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*
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* Version: 1.0.0(11/07/2025)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "11/07/2025 04:10:30 PM"
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*
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********************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#define SOCKET_PATH "/tmp/example.sock" /* UNIX域socke 路径 */
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int main(int argc, char **argv)
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{
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int rv = -1;
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int listen_fd, client_fd = -1;
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struct sockaddr_un serv_addr;
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char buf[1024];
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/* 创建 UNIX域名socket(AF_UNIX), 也叫本地套接字(AF_LOCAL) */
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listen_fd = socket(AF_UNIX /* 或使用 AF_LOCAL */, SOCK_STREAM, 0);
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if(listen_fd < 0 )
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{
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printf("create socket failure: %s\n", strerror(errno));
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return -1;
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}
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printf("socket create fd[%d]\n", listen_fd);
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/* 如果 socket 路径已存在则先删除 */
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if( !access(SOCKET_PATH, F_OK) )
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{
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unlink(SOCKET_PATH);
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}
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/* 设置 UNIX域socket 地址(路径) */
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memset(&serv_addr, 0, sizeof(serv_addr));
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serv_addr.sun_family=AF_UNIX;
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strncpy(serv_addr.sun_path, SOCKET_PATH, sizeof(serv_addr.sun_path)-1);
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/* 绑定 UNIX域socket 地址 */
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if( bind(listen_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0 )
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{
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printf("create socket failure: %s\n", strerror(errno));
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unlink(SOCKET_PATH);
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return -2;
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}
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printf("socket[%d] bind on path \"%s\" ok\n", listen_fd, SOCKET_PATH);
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/* 下面的过程与网络 socket 编程完全一致 */
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listen(listen_fd, 13);
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while(1)
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{
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printf("\nStart waiting and accept new client connect...\n");
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client_fd = accept(listen_fd, NULL, NULL);
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if(client_fd < 0)
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{
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printf("accept new socket failure: %s\n", strerror(errno));
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return -2;
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}
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memset(buf, 0, sizeof(buf));
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if( (rv=read(client_fd, buf, sizeof(buf))) < 0)
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{
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printf("Read data from client socket[%d] failure: %s\n", client_fd, strerror(errno));
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close(client_fd);
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continue;
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}
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else if( rv == 0 )
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{
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printf("client socket[%d] disconnected\n", client_fd);
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close(client_fd);
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continue;
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}
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printf("read %d bytes data from client[%d] and echo it back: '%s'\n", rv, client_fd, buf);
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if( write(client_fd, buf, rv) < 0 )
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{
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printf("Write %d bytes data back to client[%d] failure: %s\n", rv, client_fd, strerror(errno));
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close(client_fd);
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}
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sleep(1);
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close(client_fd);
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}
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close(listen_fd);
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}
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