C++监听端口Helloworld

代码来自 http://bbs.csdn.net/topics/10348663
本地 g++ 编译时有报错，微调整
portlistener.cpp

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <unistd.h>
#define     PORT       5000
#define  LINK_NUM   5


int main()
{
    socklen_t sock_fd;
    int new_fd;
    socklen_t sin_size;
    struct sockaddr_in  host_addr;
    struct sockaddr_in  client_addr;

    if((sock_fd = socket(AF_INET,SOCK_STREAM,0)) == -1)    
    {
        perror("socket");
        exit(1);
    }

    host_addr.sin_family = AF_INET;
    host_addr.sin_port = htons(PORT);
    host_addr.sin_addr.s_addr = INADDR_ANY;
    bzero(&(host_addr.sin_zero),8);


    if(bind(sock_fd,(struct sockaddr*)&host_addr,sizeof(struct sockaddr)) == -1)
    {
        perror("bind");
        exit(1);
    }

    if(listen(sock_fd,LINK_NUM) == -1)
    {
        perror("listen");
        exit(1);
    }

    while(1)
    {
        sin_size = sizeof(struct sockaddr_in);

        if((new_fd = accept(sock_fd,(struct sockaddr*)&client_addr,&sin_size)) == -1)
        {
            perror("accept");
            continue;
        }

        printf("server:got connection from %s\n",inet_ntoa(client_addr.sin_addr));

        if(!fork())
        {
            if(send(new_fd,"hi, man !\n",10,0) == -1)
            {
                perror("send");
                close(new_fd);
                exit(0);
            }

            close(new_fd);
        }

    }

    while(waitpid(-1,NULL,WNOHANG)>0);

    return 0;    
}