VxWorks中实现UDP通信的示例代码及注解

本示例展示了如何在VxWorks系统中使用UDP协议进行通信的示例代码，主要包括初始化UDP套接字、发送和接收UDP数据包等基本操作。

/* 初始化UDP套接字 */
int udpSocket = socket(AF_INET, SOCK_DGRAM, 0);
if (udpSocket < 0) {
   printf("Error: Failed to create socket!\n");
   return ERROR;
}

/* 设置本地IP和端口号 */
struct sockaddr_in localAddr;
bzero(&localAddr, sizeof(localAddr));
localAddr.sin_family = AF_INET;
localAddr.sin_addr.s_addr = htonl(INADDR_ANY);
localAddr.sin_port = htons(LOCAL_PORT);

/* 绑定UDP套接字到本地IP和端口号 */
if (bind(udpSocket, (struct sockaddr*)&localAddr, sizeof(localAddr)) < 0) {
   printf("Error: Failed to bind socket!\n");
   close(udpSocket);
   return ERROR;
}

/* 发送UDP数据包 */
struct sockaddr_in dstAddr;
bzero(&dstAddr, sizeof(dstAddr));
dstAddr.sin_family = AF_INET;
dstAddr.sin_addr.s_addr = inet_addr(REMOTE_IP);
dstAddr.sin_port = htons(REMOTE_PORT);
if (sendto(udpSocket, buffer, len, 0, (struct sockaddr*)&dstAddr, sizeof(dstAddr)) < 0) {
   printf("Error: Failed to send UDP packet!\n");
   close(udpSocket);
   return ERROR;
}

/* 接收UDP数据包 */
struct sockaddr_in srcAddr;
socklen_t addrlen = sizeof(srcAddr);
if (recvfrom(udpSocket, buffer, MAX_BUF_LEN, 0, (struct sockaddr*)&srcAddr, &addrlen) < 0) {
   printf("Error: Failed to receive UDP packet!\n");
   close(udpSocket);
   return ERROR;
}
printf("Received UDP packet from %s:%d\n", inet_ntoa(srcAddr.sin_addr), ntohs(srcAddr.sin_port));

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