用C语言实现停止等待协议代码
时间: 2024-02-16 11:03:30 浏览: 34
好的,以下是一个简单的停止等待协议的C语言实现示例:
```
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define FRAME_SIZE 16 // 帧大小
#define TIMEOUT 5000 // 超时时间(毫秒)
// 模拟发送帧
void send_frame(int frame_num, char* data) {
printf("发送帧 #%d: %s\n", frame_num, data);
}
// 模拟接收帧
int receive_frame(int expected_frame_num, char* received_data) {
int received_frame_num;
printf("等待接收帧 #%d...\n", expected_frame_num);
// 假设收到了正确的帧
strcpy(received_data, "ACK");
received_frame_num = expected_frame_num;
printf("接收到帧 #%d: %s\n", received_frame_num, received_data);
return received_frame_num;
}
int main() {
int frame_num = 0;
char data[FRAME_SIZE];
char received_data[FRAME_SIZE];
int expected_frame_num = 0;
int ack_received = 0;
int timeout = 0;
while (1) {
// 发送帧
snprintf(data, FRAME_SIZE, "Frame #%d", frame_num);
send_frame(frame_num, data);
// 等待接收 ACK
ack_received = 0;
timeout = 0;
while (!ack_received && timeout < TIMEOUT) {
expected_frame_num = frame_num;
if (receive_frame(expected_frame_num, received_data) == expected_frame_num && strcmp(received_data, "ACK") == 0) {
ack_received = 1;
printf("ACK已收到\n");
}
else {
timeout += 100;
printf("ACK未收到,重试中...\n");
}
}
// 检查是否超时
if (timeout >= TIMEOUT) {
printf("超时,重传帧 #%d\n", frame_num);
}
else {
frame_num++;
}
}
return 0;
}
```
这个示例实现了一个简单的停止等待协议,通过模拟发送帧、接收帧和发送 ACK 来模拟整个过程。在每次发送帧后,程序将等待接收 ACK,如果在超时时间内未收到 ACK,则重传帧。
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