续上一篇博客UDP通讯10054错误码补充-CFANZ编程社区

上一篇博客传送门:https://blog.51cto.com/u_14123985/5283970

补充上一篇博客中window端能正常收到所有朝自己发送的信息,但是window端自己发送的(特定情况下就是[发送端Ip和接收端一样,且发送目的的端口未开放的情况下])会被自己收到并产生10054错误.

特定情况下就是[发送端Ip和接收端一样,且发送目的的端口未开放的情况下]):我尝试用netstat -ano查找相同IP的其他开放端口进行发送时不会擅自recvfrom,发送和接收的IP不同时也不会擅自recvfrom

#include <iostream>
#include <stdio.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <cstring>
#include <arpa/inet.h>
#include<unistd.h>
void recvProcSDK(int& sock)
{
  //  int sock = (int)p;
    char s[256];
    sockaddr_in sa;
    socklen_t len = sizeof(sa);    
    while (true)
    {
        std::cout << "in recvProc" << std::endl;
        int n = recvfrom(sock, s, sizeof(s), 0, (sockaddr*)&sa, &len);
        std::cout << "recvProc over" << std::endl;
        int hport = htons(sa.sin_port);
        if (n < 0)
            break;
        s[n] = 0;
        std::cout <<"recvProcSDK" << s << std::endl;
    }
    std::cout << "proc exit" << std::endl;
}


int main(int argc,char *argv[])
{
    int sock = socket(AF_INET, SOCK_DGRAM, 0);
    sockaddr_in sa,sb;//接收端和发送端都是同一个SOCKET
    {
        sa.sin_family = AF_INET;
        sa.sin_port = htons(atoi(argv[1]));
        sa.sin_addr.s_addr = inet_addr("192.168.0.66");
        sb.sin_family = AF_INET;
        sb.sin_port = htons(9999);//window套接字的信息
        sb.sin_addr.s_addr = inet_addr("192.168.0.66");
    }

    if (bind(sock, (sockaddr*)&sa, sizeof(sa)))
    {
        std::cout << "main bind error" << std::endl;
        return -1;
    }
    if (fork() == 0) {
        recvProcSDK(sock);
    }
    char data[256];
    int n = 0;
    while (true)
    {
        std::cout << "请输入传送的内容:";
        std::cin >> data;
        n = sendto(sock, data, strlen(data), 0, (sockaddr*)&sb, sizeof(sb));//发送给另一个地址
        if (n <= 0)
        {
            std::cout << "error no" << std::endl;
        }
    }
    int stuats = 0;
    wait(&stuats);

    return 0;
}