VxWorks中实现TCP/IP通信的示例代码

此示例代码展示了如何在VxWorks中实现TCP/IP通信，包括创建服务器和客户端，建立TCP连接并进行数据传输。

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

#define SERVER_PORT 8888
#define MAX_MSG_LEN 1024

void server() {
    int listener = socket(AF_INET, SOCK_STREAM, 0);
    if(listener < 0) {
        perror("socket error");
        return;
    }

    struct sockaddr_in server_addr;
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(SERVER_PORT);

    if(bind(listener, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("bind error");
        return;
    }

    if(listen(listener, 5) < 0) {
        perror("listen error");
        return;
    }

    printf("waiting for client...\n");
    struct sockaddr_in client_addr;
    socklen_t client_addr_len = sizeof(client_addr);
    int client_sock = accept(listener, (struct sockaddr *)&client_addr, &client_addr_len);
    if(client_sock < 0) {
        perror("accept error");
        return;
    }

    char buffer[MAX_MSG_LEN+1];
    memset(buffer, 0, sizeof(buffer));
    int len = recv(client_sock, buffer, sizeof(buffer), 0);
    if(len > 0) {
        printf("receive message from client: %s\n", buffer);
    }
    close(client_sock);
    close(listener);
}

void client() {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if(sockfd < 0) {
        perror("socket error");
        return;
    }

    struct sockaddr_in server_addr;
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    server_addr.sin_port = htons(SERVER_PORT);

    if(connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("connect error");
        return;
    }

    char *message = "Hello from client";
    if(send(sockfd, message, strlen(message), 0) < 0) {
        perror("send error");
        return;
    }
    close(sockfd);
}

int main(int argc, char *argv[]) {
    if(argc < 2) {
        printf("usage: %s <server|client>\n", argv[0]);
        return -1;
    }
    if(strcmp(argv[1], "server") == 0) {
        server();
    } else if(strcmp(argv[1], "client") == 0) {
        client();
    } else {
        printf("invalid argument\n");
        return -1;
    }
    return 0;
}

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