如何在C++中使用recv或read函数读取来自tcp socket的大请求？

#include <iostream>
#include <sys/socket.h>
#include <unistd.h>

#define BUFFER_SIZE 1024

int main() {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    // 建立与远程服务器的连接

    char buffer[BUFFER_SIZE];
    int totalBytesReceived = 0;
    int expectedBytes = /* 预期的请求大小 */;

    while (totalBytesReceived < expectedBytes) {
        int bytesReceived = recv(sockfd, buffer + totalBytesReceived, BUFFER_SIZE - totalBytesReceived, 0);
        if (bytesReceived < 0) {
            // 接收数据出错
            break;
        } else if (bytesReceived == 0) {
            // 连接已关闭
            break;
        } else {
            totalBytesReceived += bytesReceived;
        }
    }

    // 处理接收到的完整请求数据

    close(sockfd);
    return 0;
}