what wrong with "gethostbyname()" funcation ?

incarnation

source :

2. #include <sys/socket.h>
3. #include <sys/types.h>
4. #include <netinet/in.h>
5. #include <unistd.h>
6. #include <stdio.h>
7. int
8. main(void)
9. {
10.    const char        *host_name="a_host";
11.    struct hostent    *pr;
12.    char              **ppr;
13.    char              str[INET6_ADDRSTRLEN];
14.    if((pr=gethostbyname(host_name))==NULL) {
15.           perror("gethostbyname error");
16.           exit(1);
17.    }
18.    printf("offical hostname is %s\n",pr->h_name) ; /* print the officl hostname */
19.    for(ppr=pr->h_aliases; *ppr !=NULL; ppr++)      /* print the alias hostname */
20.           printf(" host aliases is    %s\n",*ppr);
21.    printf(" the addrles length is %d\n",pr->h_length);
22.    swith(pr->h_addrtype) {
23.           case AF_INET :
24. #ifdef    AF_INET6
25.           case AF_INET6 :
26. #endif
27.              ppr=pr->h_addr_list ;
28.              for( ; *ppr != NULL ; ppr++)
29.                     printf( "other adddress list is %s\n",
30.                            inet_ntop(pr->h_addrtype,*ppr,str,sizeof(str)) );
31.              break;
32.           default :
33.                     printf("unknown address type \n");
34.                     break;
35.    }
36. }

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this is error message  

2. In file included from gethostbyname.c:1:
3. /usr/include/sys/socket.h:20: syntax error before `sa_family_t'
4. /usr/include/sys/socket.h:20: warning: data definition has no type or storage class
5. /usr/include/sys/socket.h:131: syntax error before `u_char'
6. /usr/include/sys/socket.h:142: syntax error before `u_short'
7. /usr/include/sys/socket.h:156: syntax error before `u_char'
8. /usr/include/sys/socket.h:158: `int64_t' undeclared here (not in a function)
9. /usr/include/sys/socket.h:158: `u_char' undeclared here (not in a function)
10. /usr/include/sys/socket.h:158: size of array `__ss_pad1' is too large
11. /usr/include/sys/socket.h:159: syntax error before `int64_t'
12. /usr/include/sys/socket.h:160: `u_char' undeclared here (not in a function)
13. /usr/include/sys/socket.h:160: `int64_t' undeclared here (not in a function)
14. /usr/include/sys/socket.h:160: `u_char' undeclared here (not in a function)
15. /usr/include/sys/socket.h:160: `int64_t' undeclared here (not in a function)
16. /usr/include/sys/socket.h:327: syntax error before `pid_t'
17. /usr/include/sys/socket.h:332: syntax error before `gid_t'
18. /usr/include/sys/socket.h:367: syntax error before `u_short'
19. /usr/include/sys/socket.h:375: syntax error before `caddr_t'
20. /usr/include/sys/socket.h:379: syntax error before `caddr_t'
21. In file included from gethostbyname.c:1:
22. /usr/include/sys/socket.h:412: syntax error before `recv'
23. /usr/include/sys/socket.h:412: syntax error before `size_t'
24. /usr/include/sys/socket.h:412: warning: data definition has no type or storage class
25. /usr/include/sys/socket.h:413: syntax error before `recvfrom'
26. /usr/include/sys/socket.h:413: syntax error before `size_t'
27. /usr/include/sys/socket.h:413: warning: data definition has no type or storage class
28. /usr/include/sys/socket.h:414: syntax error before `recvmsg'
29. /usr/include/sys/socket.h:414: warning: data definition has no type or storage class
30. /usr/include/sys/socket.h:415: syntax error before `send'
31. /usr/include/sys/socket.h:415: syntax error before `size_t'
32. /usr/include/sys/socket.h:415: warning: data definition has no type or storage class
33. /usr/include/sys/socket.h:416: syntax error before `sendto'
34. /usr/include/sys/socket.h:417: syntax error before `size_t'
35. /usr/include/sys/socket.h:417: warning: data definition has no type or storage class
36. /usr/include/sys/socket.h:418: syntax error before `sendmsg'
37. /usr/include/sys/socket.h:418: warning: data definition has no type or storage class
38. /usr/include/sys/socket.h:419: syntax error before `off_t'
39. gethostbyname.c: In function `main':
40. gethostbyname.c:13: warning: assignment makes pointer from integer without a cast
41. gethostbyname.c:17: dereferencing pointer to incomplete type
42. gethostbyname.c:18: dereferencing pointer to incomplete type
43. gethostbyname.c:20: dereferencing pointer to incomplete type
44. gethostbyname.c:21: dereferencing pointer to incomplete type
45. gethostbyname.c:21: syntax error before `{'
46. gethostbyname.c:29: dereferencing pointer to incomplete type
47. gethostbyname.c:30: break statement not within loop or switch
48. gethostbyname.c:31: default label not within a switch statement
49. gethostbyname.c:33: break statement not within loop or switch
50. gethostbyname.c: At top level:
51. gethostbyname.c:35: syntax error before `}'

复制代码

incarnation

argv type is ?? how to set the argv 1 ?