1 #include<netdb.h>
 2 #include<stdio.h>
 3 #include<stdlib.h>
 4 #include<string.h>
 5 //#include<unp.h>
 6 int main(){
 7 struct servent *serv=(struct servent * )calloc(1,sizeof(struct servent));
 8 
 9 serv=getservbyname("domain","tcp");
10 if(serv==NULL){
11     perror("gethostbyname ----:");
12     exit(EXIT_FAILURE);
13 }
14 //serv[1]=(struct servent)NULL;
15 printf("s_name %s\n",serv->s_name);
16 printf("s_aliases %s\n",*serv->s_aliases);
17 printf("s_port %d\n",serv->s_port);
18 printf("s_proto %s\n ",serv->s_proto);
19 
20 printf("-------------\n");
21 //bzero(serv,sizeof(struct servent));
22 
23 
24 struct servent* ser=getservbyport(13568,"tcp");
25 printf("s_name %s\n",ser->s_name);
26 printf("s_aliases %s\n",*ser->s_aliases);
27 printf("s_port %d\n",ser->s_port);
28 printf("s_proto %s\n ",ser->s_proto);
29 
30 printf("-------------\n");
31 //ser[1]=(struct servent)NULL;
32 //free(&ser[0]);
33 //free(&serv[0]);
34 free(ser);
35 free(serv);
36 return 0;
37 }