c++ tcp client socket客户端 linux

#include <cstring>
#include <iostream>
#include <string>

#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>

int main()
{
    char *ipAddress = (char *)"127.0.0.1";
    char *portNum = (char *)"8888";

    addrinfo hints, *p;
    memset(&hints, 0, sizeof(hints));
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags = AI_PASSIVE;

    int gAddRes = getaddrinfo(ipAddress, portNum, &hints, &p);
    if (gAddRes != 0)
    {
        std::cerr << gai_strerror(gAddRes) << "\n";
        return -2;
    }

    if (p == NULL)
    {
        std::cerr << "No addresses found\n";
        return -3;
    }

    int sockFD = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
    if (sockFD == -1)
    {
        std::cerr << "Error while creating socket\n";
        return -4;
    }

    int connectR = connect(sockFD, p->ai_addr, p->ai_addrlen);
    if (connectR == -1)
    {
        close(sockFD);
        std::cerr << "Error while connecting socket\n";
        return -5;
    }

    char recv_data[204800];

    while (1)
    {
        auto bytes_recv = recv(sockFD, &recv_data, 204800, 0);
        if (bytes_recv > -1)
        {
            // char *payload = (char *)malloc(bytes_recv);
            // memcpy(payload, recv_data, bytes_recv);
            std::cout << recv_data << std::endl;
            memset(recv_data, 0, 204800);
        }
    }
    close(sockFD);
    freeaddrinfo(p);

    return 0;
}

https://riptutorial.com/cplusplus/example/24000/hello-tcp-client