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 != 2) {
        printf("Usage :%s <addr>\n",argv[0]);
        exit(1);
    }

    host = gethostbyname(argv[1]);
    if (!host) {
        error_handling("gethost err");
    }

    for (i = 0;host->h_aliases[i];i++) {
        printf("alias : %d <%s>\n",i,host->h_aliases[i]);
    }
    for (i = 0;host->h_addr_list[i];i++) {
        printf("ip : %d <%s>\n",i,inet_ntoa(*(struct in_addr*)host->h_addr_list[i]));
    }

    return 0;
}


void error_handling(char *msg)
{
    fputs(msg,stderr);
    fputc('\n',stderr);
    exit(1);
}