/*********************************************************************************
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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_client.c
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* Description: This file is UNIX domain socket client 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 04:17:02 PM"
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*
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********************************************************************************/
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#include <stdio.h>
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#include <errno.h>
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#include <string.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, 与服务器保持一致 */
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#define MSG_STR "Hello, Unix Domain Socket Server!"
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int main(int argc, char **argv)
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{
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int conn_fd = -1;
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int rv = -1;
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char buf[1024];
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struct sockaddr_un serv_addr;
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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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conn_fd = socket(AF_UNIX /* 或使用 AF_LOCAL */, SOCK_STREAM, 0);
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if(conn_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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/* 设置服务器 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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/* 连接 UNIX域socket 服务器 */
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if( connect(conn_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
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{
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printf("connect to unix domain socket server on \"%s\" failure: %s\n", SOCKET_PATH, strerror(errno));
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return 0;
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}
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printf("connect to unix domain socket server on \"%s\" ok\n", 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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if( write(conn_fd, MSG_STR, strlen(MSG_STR)) < 0 )
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{
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printf("write data to unix domain socket server on \"%s\" failure: %s\n", SOCKET_PATH, strerror(errno));
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goto cleanup;
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}
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memset(buf, 0, sizeof(buf));
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rv = read(conn_fd, buf, sizeof(buf));
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if(rv < 0)
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{
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printf("Read data from server failure: %s\n", strerror(errno));
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goto cleanup;
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}
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else if( 0 == rv )
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{
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printf("Client connect to server get disconnected\n");
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goto cleanup;
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}
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printf("Read %d bytes data from server: '%s'\n", rv, buf);
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cleanup:
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close(conn_fd);
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}
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