gethostent函数

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>

int main(int argc, char * * argv)
{
    printf("sethostent函数执行：\n");
    sethostent(1);
    printf("-1.-1**************************************\n");
    struct hostent * host = NULL;
    host = gethostent();
    printf("h_name      =[%s]\n", host->h_name);
    printf("*h_aliases  =[%s]\n", *(host->h_aliases));
    printf("h_addrtype  =[%d]\n", host->h_addrtype);
    printf("h_length    =[%d]\n", host->h_length);
    printf("h_addr_list =[%s]\n", host->h_addr_list[0]);
    printf("h_addr      =[%s]\n", host->h_addr);

    struct sockaddr_in sin;
    bzero(&sin, sizeof(sin));
    bcopy(host->h_addr, &sin.sin_addr, host->h_length);
    char ipbuf[128];
    memset(ipbuf, 0, sizeof(ipbuf));
    inet_ntop(AF_INET, &sin.sin_addr.s_addr, ipbuf, sizeof(ipbuf));
    printf("主机名=[%s],IP地址=[%s]\n",host->h_name,ipbuf);

    bzero(&sin, sizeof(sin));
    memcpy(&sin.sin_addr, host->h_addr, host->h_length);
    memset(ipbuf, 0, sizeof(ipbuf));
    inet_ntop(AF_INET, &sin.sin_addr.s_addr, ipbuf, sizeof(ipbuf));
    printf("主机名=[%s],IP地址=[%s]\n",host->h_name,ipbuf);

    printf("000**************************************\n");
    struct hostent * host0 = NULL;
    host0 = gethostent();
    printf("h_name      =[%s]\n", host0->h_name);
    printf("*h_aliases  =[%s]\n", *(host0->h_aliases));
    printf("h_addrtype  =[%d]\n", host0->h_addrtype);
    printf("h_length    =[%d]\n", host0->h_length);
    printf("h_addr_list =[%s]\n", host->h_addr_list);
    printf("*h_addr_list=[%s]\n", *(host->h_addr_list));
    printf("h_addr_list[0]=[%s]\n", (host->h_addr_list)[0]);
    printf("h_addr_list[1]=[%s]\n", (host->h_addr_list)[1]);
    /*
    printf("h_addr_list[2]=[%s]\n", (host->h_addr_list)[2]);
    printf("h_addr_list[3]=[%s]\n", (host->h_addr_list)[3]);
    printf("h_addr_list[4]=[%s]\n", (host->h_addr_list)[4]);
    */

    printf("111**************************************\n");
    struct hostent * host1 = NULL;
    host1 = gethostent();
    printf("h_name      =[%s]\n", host1->h_name);
    printf("*h_aliases  =[%s]\n", *(host1->h_aliases));
    printf("h_addrtype  =[%d]\n", host1->h_addrtype);
    printf("h_length    =[%d]\n", host1->h_length);

    printf("222**************************************\n");
    struct hostent * host2 = NULL;
    host2 = gethostent();
    printf("h_name      =[%s]\n", host2->h_name);
    printf("*h_aliases  =[%s]\n", *(host2->h_aliases));
    printf("h_addrtype  =[%d]\n", host2->h_addrtype);
    printf("h_length    =[%d]\n", host2->h_length);

    printf("333**************************************\n");
    /*sethostent(1);*/
    struct hostent * host3 = NULL;
    host3 = gethostent();
    printf("h_name      =[%s]\n", host3->h_name);
    printf("*h_aliases  =[%s]\n", *(host3->h_aliases));
    printf("h_addrtype  =[%d]\n", host3->h_addrtype);
    printf("h_length    =[%d]\n", host3->h_length);

    printf("444**************************************\n");
    struct hostent * host4 = NULL;
    host4 = gethostent();
    printf("h_name      =[%s]\n", host4->h_name);
    printf("*h_aliases  =[%s]\n", *(host4->h_aliases));
    printf("h_addrtype  =[%d]\n", host4->h_addrtype);
    printf("h_length    =[%d]\n", host4->h_length);

    printf("555**************************************\n");
    sethostent(1);
    struct hostent * host5 = NULL;
    host5 = gethostent();
    printf("h_name      =[%s]\n", host5->h_name);
    printf("*h_aliases  =[%s]\n", *(host5->h_aliases));
    printf("h_addrtype  =[%d]\n", host5->h_addrtype);
    printf("h_length    =[%d]\n", host5->h_length);

    printf("sethostent函数执行：\n");
    sethostent(1);
    printf("666**************************************\n");
    struct hostent * host6 = NULL;
    host6 = gethostent();
    printf("h_name      =[%s]\n", host6->h_name);
    printf("*h_aliases  =[%s]\n", *(host6->h_aliases));
    printf("h_addrtype  =[%d]\n", host6->h_addrtype);
    printf("h_length    =[%d]\n", host6->h_length);

    printf("777**************************************\n");
    struct hostent * host7 = NULL;
    host7 = gethostent();
    printf("h_name      =[%s]\n", host7->h_name);
    printf("*h_aliases  =[%s]\n", *(host7->h_aliases));
    printf("h_addrtype  =[%d]\n", host7->h_addrtype);
    printf("h_length    =[%d]\n", host7->h_length);

    printf("888**************************************\n");
    struct hostent * host8 = NULL;
    host8 = gethostent();
    printf("h_name      =[%s]\n", host8->h_name);
    printf("*h_aliases  =[%s]\n", *(host8->h_aliases));
    printf("h_addrtype  =[%d]\n", host8->h_addrtype);
    printf("h_length    =[%d]\n", host8->h_length);

    printf("999**************************************\n");
    struct hostent * host9 = NULL;
    host9 = gethostent();
    printf("h_name      =[%s]\n", host9->h_name);
    printf("*h_aliases  =[%s]\n", *(host9->h_aliases));
    printf("h_addrtype  =[%d]\n", host9->h_addrtype);
    printf("h_length    =[%d]\n", host9->h_length);

        printf("10.10**************************************\n");
    struct hostent * host10 = NULL;
    host10 = gethostent();
    printf("h_name      =[%s]\n", host10->h_name);
    printf("*h_aliases  =[%s]\n", *(host10->h_aliases));
    printf("h_addrtype  =[%d]\n", host10->h_addrtype);
    printf("h_length    =[%d]\n", host10->h_length);

    printf("11.11**************************************\n");
    struct hostent * host11 = NULL;
    host11 = gethostent();
    printf("h_name      =[%s]\n", host11->h_name);
    printf("*h_aliases  =[%s]\n", *(host11->h_aliases));
    printf("h_addrtype  =[%d]\n", host11->h_addrtype);
    printf("h_length    =[%d]\n", host11->h_length);

    printf("12.12**************************************\n");
    struct hostent * host12 = NULL;
    host12 = gethostent();
    printf("h_name      =[%s]\n", host12->h_name);
    printf("*h_aliases  =[%s]\n", *(host12->h_aliases));
    printf("h_addrtype  =[%d]\n", host12->h_addrtype);
    printf("h_length    =[%d]\n", host12->h_length);

    return 0;
}