socket地址绑定的问题

奔跑小子

1. int main(int argc, char *argv[])
   
2. {
   
3.     struct sockaddr_in send_addr, rec_addr;
   
4. 
   
5.     send_addr.sin_family = AF_INET;
   
6.     send_addr.sin_addr.s_addr = inet_addr(argv[1]);
   
7.     send_addr.sin_port = htons(atoi(argv[2]));
   
8. 
   
9.     rec_addr.sin_family = AF_INET;
   
10.     rec_addr.sin_addr.s_addr = inet_addr(argv[3]);
    
11.     rec_addr.sin_port = htons(atoi(argv[4]));
    
12. 
    
13.     printf("%s:%d %s:%d\n",inet_ntoa(send_addr.sin_addr), ntohs(send_addr.sin_port),
    
14.         inet_ntoa(rec_addr.sin_addr), ntohs(rec_addr.sin_port));
    
15. 
    
16.         return 0;
    
17. }

复制代码

不知道为什么输出的send_addr, rec_addr的IP永远是一样的，而端口号设定却没问题

hellioncu

inet_ntoa 返回的是内部的存储区，分开放在两个printf中调用

奔跑小子

回复 2# hellioncu
原来是这样，谢谢了


   

cxytz01

man inet_ntoa

The  inet_ntoa()  function  converts  the  Internet host address in, given in network byte order, to a string in IPv4 dotted-decimal notation.  The string is returned in a statically
       allocated buffer, which subsequent calls will overwrite.