getprotoent函数

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

int main(int argc, char * * argv)
{
    printf("setprotoent 函数执行：\n");
    setprotoent(1);
    printf("000000**************************************\n");
    struct protoent * proto0 = NULL;
    proto0 = getprotoent();
    if(proto0 != NULL)
    {
        printf("p_name      =[%s]\n", proto0->p_name);
        printf("p_aliases[0]=[%s]\n", proto0->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto0->p_proto);
    }
    else
    {
        printf("proto0 is null\n");
    }

    printf("111111**************************************\n");
    struct protoent * proto1 = NULL;
    proto1 = getprotoent();
    if(proto1 != NULL)
    {
        printf("p_name      =[%s]\n", proto1->p_name);
        printf("p_aliases[0]=[%s]\n", proto1->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto1->p_proto);
    }
    else
    {
        printf("proto1 is null\n");
    }

    printf("222222**************************************\n");
    struct protoent * proto2 = NULL;
    proto2 = getprotoent();
    if(proto2 != NULL)
    {
        printf("p_name      =[%s]\n", proto2->p_name);
        printf("p_aliases[0]=[%s]\n", proto2->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto2->p_proto);
    }
    else
    {
        printf("proto2 is null\n");
    }

    printf("333333**************************************\n");
    struct protoent * proto3 = NULL;
    proto3 = getprotoent();
    if(proto3 != NULL)
    {
        printf("p_name      =[%s]\n", proto3->p_name);
        printf("p_aliases[0]=[%s]\n", proto3->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto3->p_proto);
    }
    else
    {
        printf("proto3 is null\n");
    }

    printf("444444**************************************\n");
    struct protoent * proto4 = NULL;
    proto4 = getprotoent();
    if(proto4 != NULL)
    {
        printf("p_name      =[%s]\n", proto4->p_name);
        printf("p_aliases[0]=[%s]\n", proto4->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto4->p_proto);
    }
    else
    {
        printf("proto4 is null\n");
    }

    printf("555555**************************************\n");
    struct protoent * proto5 = NULL;
    proto5 = getprotoent();
    if(proto5 != NULL)
    {
        printf("p_name      =[%s]\n", proto5->p_name);
        printf("p_aliases[0]=[%s]\n", proto5->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto5->p_proto);
    }
    else
    {
        printf("proto5 is null\n");
    }

    printf("666666**************************************\n");
    struct protoent * proto6 = NULL;
    proto6 = getprotoent();
    if(proto6 != NULL)
    {
        printf("p_name      =[%s]\n", proto6->p_name);
        printf("p_aliases[0]=[%s]\n", proto6->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto6->p_proto);
    }
    else
    {
        printf("proto6 is null\n");
    }

    printf("777777**************************************\n");
    struct protoent * proto7 = NULL;
    proto7 = getprotoent();
    if(proto7 != NULL)
    {
        printf("p_name      =[%s]\n", proto7->p_name);
        printf("p_aliases[0]=[%s]\n", proto7->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto7->p_proto);
    }
    else
    {
        printf("proto7 is null\n");
    }

    printf("888888**************************************\n");
    struct protoent * proto8 = NULL;
    proto8 = getprotoent();
    if(proto8 != NULL)
    {
        printf("p_name      =[%s]\n", proto8->p_name);
        printf("p_aliases[0]=[%s]\n", proto8->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto8->p_proto);
    }
    else
    {
        printf("proto8 is null\n");
    }

    printf("999999**************************************\n");
    struct protoent * proto9 = NULL;
    proto9 = getprotoent();
    if(proto7 != NULL)
    {
        printf("p_name      =[%s]\n", proto9->p_name);
        printf("p_aliases[0]=[%s]\n", proto9->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto9->p_proto);
    }
    else
    {
        printf("proto9 is null\n");
    }

    printf("10.10**************************************\n");
    struct protoent * proto10 = NULL;
    proto10 = getprotoent();
    if(proto10 != NULL)
    {
        printf("p_name      =[%s]\n", proto10->p_name);
        printf("p_aliases[0]=[%s]\n", proto10->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto10->p_proto);
    }
    else
    {
        printf("proto10 is null\n");
    }

    printf("11.11**************************************\n");
    struct protoent * proto11 = NULL;
    proto11 = getprotoent();
    if(proto11 != NULL)
    {
        printf("p_name      =[%s]\n", proto11->p_name);
        printf("p_aliases[0]=[%s]\n", proto11->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto11->p_proto);
    }
    else
    {
        printf("proto11 is null\n");
    }

    printf("12.12**************************************\n");
    struct protoent * proto12 = NULL;
    proto12 = getprotoent();
    if(proto12 != NULL)
    {
        printf("p_name      =[%s]\n", proto12->p_name);
        printf("p_aliases[0]=[%s]\n", proto12->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto12->p_proto);
    }
    else
    {
        printf("proto12 is null\n");
    }

    printf("13.13**************************************\n");
    struct protoent * proto13 = NULL;
    proto13 = getprotobyname("BBN-RCC-MON");
    if(proto13 != NULL)
    {
        printf("p_name      =[%s]\n", proto13->p_name);
        printf("p_aliases[0]=[%s]\n", proto13->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto13->p_proto);
    }
    else
    {
        printf("proto13 is null\n");
    }

    printf("14.14**************************************\n");
    struct protoent * proto14 = NULL;
    proto14 = getprotobynumber(proto13->p_proto);
    if(proto14 != NULL)
    {
        printf("p_name      =[%s]\n", proto14->p_name);
        printf("p_aliases[0]=[%s]\n", proto14->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto14->p_proto);
    }
    else
    {
        printf("proto14 is null\n");
    }

    printf("15.15**************************************\n");
    struct protoent * proto15 = NULL;
    proto15 = getprotobynumber(0);
    if(proto15 != NULL)
    {
        printf("p_name      =[%s]\n", proto15->p_name);
        printf("p_aliases[0]=[%s]\n", proto15->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto15->p_proto);
    }
    else
    {
        printf("proto15 is null\n");
    }

    printf("16.16**************************************\n");
    struct protoent * proto16 = NULL;
    proto16 = getprotobynumber(1);
    if(proto16 != NULL)
    {
        printf("p_name      =[%s]\n", proto16->p_name);
        printf("p_aliases[0]=[%s]\n", proto16->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto16->p_proto);
    }
    else
    {
        printf("proto16 is null\n");
    }

    printf("17.17**************************************\n");
    struct protoent * proto17 = NULL;
    proto17 = getprotobyname("hopopt");
    if(proto17 != NULL)
    {
        printf("p_name      =[%s]\n", proto17->p_name);
        printf("p_aliases[0]=[%s]\n", proto17->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto17->p_proto);
    }
    else
    {
        printf("proto17 is null\n");
    }

    printf("18.18**************************************\n");
    struct protoent * proto18 = NULL;
    proto18 = getprotobyname("IP");
    if(proto18 != NULL)
    {
        printf("p_name      =[%s]\n", proto18->p_name);
        printf("p_aliases[0]=[%s]\n", proto18->p_aliases[0]);
        printf("p_proto     =[%d]\n", proto18->p_proto);
    }
    else
    {
        printf("proto18 is null\n");
    }

    return 0;
}