检查套接字是否正在C中侦听

#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>

int main()
{
    int sockfd;
    struct sockaddr_in serv_addr;
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(8080);
    bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
    listen(sockfd, 5);
    while (1)
    {
        struct sockaddr_in client_addr;
        socklen_t clilen = sizeof(client_addr);
        int connfd = accept(sockfd, (struct sockaddr *)&client_addr, &clilen);
        printf("Connection accepted
");
        char buffer[256];
        memset(buffer, 0, sizeof(buffer));
        read(connfd, buffer, sizeof(buffer));
        printf("Received message: %s
", buffer);
        char response[] = "Message received";
        write(connfd, response, strlen(response));
    }
    return 0;
}

ifconfig

sudo route add -net 192.168.10.0 netmask 255.255.255.0 gw 192.168.1.1