linux下gethostbyname通过域名获取IP的例子

#include
#include
#include
#include
#include
#include
#include


int main(int argc, char *argv[])
{
    int i;
    struct hostent *he;
    struct in_addr **addr_list;


    if (argc != 2) {
        fprintf(stderr,"usage: ghbn hostname\n");
        return 1;
    }


    if ((he = gethostbyname(argv[1])) == NULL) {  // get the host info
        herror("gethostbyname");
        return 2;
    }


    // print information about this host:
    printf("Official name is: %s\n", he->h_name);
    printf("    IP addresses: ");
    addr_list = (struct in_addr **)he->h_addr_list;
    for(i = 0; addr_list[i] != NULL; i++) {
        printf("%s ", inet_ntoa(*addr_list[i]));
    }
    printf("\n");


    return 0;
}