QNX中使用socket实现TCP/IP通信示例代码

本示例代码演示了在QNX操作系统上使用socket实现TCP/IP通信的方法，通过监听端口和接收数据实现了简单的网络通信。

#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>

#define PORT 1234 // 端口号

int main() {
    int sockfd, connfd;
    struct sockaddr_in server, client;
    socklen_t len;
    char buf[1024];

    sockfd = socket(AF_INET, SOCK_STREAM, 0); // 创建socket
    if (sockfd == -1) {
        printf("Failed to create socket.\n");
        exit(EXIT_FAILURE);
    }

    memset(&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = htonl(INADDR_ANY);
    server.sin_port = htons(PORT);

    if (bind(sockfd, (struct sockaddr*)&server, sizeof(server)) != 0) { // 绑定sockfd和server
        printf("Bind failed.\n");
        exit(EXIT_FAILURE);
    }

    if (listen(sockfd, 5) != 0) { // 监听端口
        printf("Listen failed.\n");
        exit(EXIT_FAILURE);
    }

    printf("Listening on port %d...\n", PORT);

    while (1) {
        len = sizeof(client);
        connfd = accept(sockfd, (struct sockaddr*)&client, &len); // 接收请求
        if (connfd < 0) {
            printf("Accept failed.\n");
            exit(EXIT_FAILURE);
        }

        memset(buf, 0, sizeof(buf));
        if (read(connfd, buf, sizeof(buf)) > 0) { // 读取数据
            printf("Received message from %s:%d: %s\n", inet_ntoa(client.sin_addr), ntohs(client.sin_port), buf);
        }

        close(connfd); // 关闭连接
    }

    close(sockfd);
    return 0;
}

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