获取网站IP地址（Linux，C)

 #include <netdb.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <arpa/inet.h>
 #include <netdb.h>

 void error_handling(char *msg);

 int main(int argc,char **argv)
 {
     int i;

     struct hostent *host;
     if (argc != ) {
         printf("Usage :%s <addr>\n",argv[]);
         exit();
     }

     host = gethostbyname(argv[]);
     if (!host) {
         error_handling("gethost err");
     }

     for (i = ;host->h_aliases[i];i++) {
         printf("alias : %d <%s>\n",i,host->h_aliases[i]);
     }
     for (i = ;host->h_addr_list[i];i++) {
         printf("ip : %d <%s>\n",i,inet_ntoa(*(struct in_addr*)host->h_addr_list[i]));
     }

     return ;
 }

 void error_handling(char *msg)
 {
     fputs(msg,stderr);
     fputc('\n',stderr);
     exit();
 }