diplodocus.org Git - nmh/blob - docs/historical/mh-6.8.5/h/netdb.h

   1 /* @(#)$Id: netdb.h,v 2.1 90/04/05 15:06:01 sources Exp $ */
   2 /*
   3  * Copyright (c) 1980,1983,1988 Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms are permitted
   7  * provided that this notice is preserved and that due credit is given
   8  * to the University of California at Berkeley. The name of the University
   9  * may not be used to endorse or promote products derived from this
  10  * software without specific prior written permission. This software
  11  * is provided ``as is'' without express or implied warranty.
  12  *
  13  *      @(#)netdb.h     5.9 (Berkeley) 4/5/88
  14  */
  15
  16 /*
  17  * Structures returned by network
  18  * data base library.  All addresses
  19  * are supplied in host order, and
  20  * returned in network order (suitable
  21  * for use in system calls).
  22  */
  23 struct  hostent {
  24         char    *h_name;        /* official name of host */
  25         char    **h_aliases;    /* alias list */
  26         int     h_addrtype;     /* host address type */
  27         int     h_length;       /* length of address */
  28         char    **h_addr_list;  /* list of addresses from name server */
  29 #define h_addr  h_addr_list[0]  /* address, for backward compatiblity */
  30 };
  31
  32 /*
  33  * Assumption here is that a network number
  34  * fits in 32 bits -- probably a poor one.
  35  */
  36 struct  netent {
  37         char            *n_name;        /* official name of net */
  38         char            **n_aliases;    /* alias list */
  39         int             n_addrtype;     /* net address type */
  40         unsigned long   n_net;          /* network # */
  41 };
  42
  43 struct  servent {
  44         char    *s_name;        /* official service name */
  45         char    **s_aliases;    /* alias list */
  46         int     s_port;         /* port # */
  47         char    *s_proto;       /* protocol to use */
  48 };
  49
  50 struct  protoent {
  51         char    *p_name;        /* official protocol name */
  52         char    **p_aliases;    /* alias list */
  53         int     p_proto;        /* protocol # */
  54 };
  55
  56 struct hostent  *gethostbyname(), *gethostbyaddr(), *gethostent();
  57 struct netent   *getnetbyname(), *getnetbyaddr(), *getnetent();
  58 struct servent  *getservbyname(), *getservbyport(), *getservent();
  59 struct protoent *getprotobyname(), *getprotobynumber(), *getprotoent();
  60
  61 /*
  62  * Error return codes from gethostbyname() and gethostbyaddr()
  63  * (left in extern int h_errno).
  64  */
  65
  66 #define HOST_NOT_FOUND  1 /* Authoritative Answer Host not found */
  67 #define TRY_AGAIN       2 /* Non-Authoritive Host not found, or SERVERFAIL */
  68 #define NO_RECOVERY     3 /* Non recoverable errors, FORMERR, REFUSED, NOTIMP */
  69 #define NO_DATA         4 /* Valid name, no data record of requested type */
  70 #define NO_ADDRESS      NO_DATA         /* no address, look for MX record */