about summary refs log tree commit diff
path: root/resolv/netdb.h
blob: 204ba2ebf85ff5efec38140a1b89d8af7affe158 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
  /* Copyright (C) 1996-2002, 2003, 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* All data returned by the network data base library are supplied in
   host order and returned in network order (suitable for use in
   system calls).  */

#ifndef	_NETDB_H
#define	_NETDB_H	1

#include <features.h>

#include <netinet/in.h>
#include <stdint.h>
#ifdef __USE_MISC
/* This is necessary to make this include file properly replace the
   Sun version.  */
# include <rpc/netdb.h>
#endif

#ifdef __USE_GNU
# define __need_sigevent_t
# include <bits/siginfo.h>
# define __need_timespec
# include <time.h>
#endif

#include <bits/netdb.h>

/* Absolute file name for network data base files.  */
#define	_PATH_HEQUIV		"/etc/hosts.equiv"
#define	_PATH_HOSTS		"/etc/hosts"
#define	_PATH_NETWORKS		"/etc/networks"
#define	_PATH_NSSWITCH_CONF	"/etc/nsswitch.conf"
#define	_PATH_PROTOCOLS		"/etc/protocols"
#define	_PATH_SERVICES		"/etc/services"


__BEGIN_DECLS

/* Error status for non-reentrant lookup functions.
   We use a macro to access always the thread-specific `h_errno' variable.  */
#define h_errno (*__h_errno_location ())

/* Function to get address of global `h_errno' variable.  */
extern int *__h_errno_location (void) __THROW __attribute__ ((__const__));


/* Possible values left in `h_errno'.  */
#define	NETDB_INTERNAL	-1	/* See errno.  */
#define	NETDB_SUCCESS	0	/* No problem.  */
#define	HOST_NOT_FOUND	1	/* Authoritative Answer Host not found.  */
#define	TRY_AGAIN	2	/* Non-Authoritative Host not found,
				   or SERVERFAIL.  */
#define	NO_RECOVERY	3	/* Non recoverable errors, FORMERR, REFUSED,
				   NOTIMP.  */
#define	NO_DATA		4	/* Valid name, no data record of requested
				   type.  */
#define	NO_ADDRESS	NO_DATA	/* No address, look for MX record.  */

#ifdef __USE_XOPEN2K
/* Highest reserved Internet port number.  */
# define IPPORT_RESERVED	1024
#endif

#ifdef __USE_GNU
/* Scope delimiter for getaddrinfo(), getnameinfo().  */
# define SCOPE_DELIMITER	'%'
#endif

/* Print error indicated by `h_errno' variable on standard error.  STR
   if non-null is printed before the error string.  */
extern void herror (__const char *__str) __THROW;

/* Return string associated with error ERR_NUM.  */
extern __const char *hstrerror (int __err_num) __THROW;



/* Description of data base entry for a single host.  */
struct hostent
{
  char *h_name;			/* Official name of host.  */
  char **h_aliases;		/* Alias list.  */
  int h_addrtype;		/* Host address type.  */
  int h_length;			/* Length of address.  */
  char **h_addr_list;		/* List of addresses from name server.  */
#define	h_addr	h_addr_list[0]	/* Address, for backward compatibility.  */
};

/* Open host data base files and mark them as staying open even after
   a later search if STAY_OPEN is non-zero.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern void sethostent (int __stay_open);

/* Close host data base files and clear `stay open' flag.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern void endhostent (void);

/* Get next entry from host data base file.  Open data base if
   necessary.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct hostent *gethostent (void);

/* Return entry from host data base which address match ADDR with
   length LEN and type TYPE.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct hostent *gethostbyaddr (__const void *__addr, __socklen_t __len,
				      int __type);

/* Return entry from host data base for host with NAME.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct hostent *gethostbyname (__const char *__name);

#ifdef __USE_MISC
/* Return entry from host data base for host with NAME.  AF must be
   set to the address type which is `AF_INET' for IPv4 or `AF_INET6'
   for IPv6.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern struct hostent *gethostbyname2 (__const char *__name, int __af);

/* Reentrant versions of the functions above.  The additional
   arguments specify a buffer of BUFLEN starting at BUF.  The last
   argument is a pointer to a variable which gets the value which
   would be stored in the global variable `herrno' by the
   non-reentrant functions.

   These functions are not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation they are cancellation points and
   therefore not marked with __THROW.  */
extern int gethostent_r (struct hostent *__restrict __result_buf,
			 char *__restrict __buf, size_t __buflen,
			 struct hostent **__restrict __result,
			 int *__restrict __h_errnop);

extern int gethostbyaddr_r (__const void *__restrict __addr, __socklen_t __len,
			    int __type,
			    struct hostent *__restrict __result_buf,
			    char *__restrict __buf, size_t __buflen,
			    struct hostent **__restrict __result,
			    int *__restrict __h_errnop);

extern int gethostbyname_r (__const char *__restrict __name,
			    struct hostent *__restrict __result_buf,
			    char *__restrict __buf, size_t __buflen,
			    struct hostent **__restrict __result,
			    int *__restrict __h_errnop);

extern int gethostbyname2_r (__const char *__restrict __name, int __af,
			     struct hostent *__restrict __result_buf,
			     char *__restrict __buf, size_t __buflen,
			     struct hostent **__restrict __result,
			     int *__restrict __h_errnop);
#endif	/* misc */


/* Open network data base files and mark them as staying open even
   after a later search if STAY_OPEN is non-zero.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern void setnetent (int __stay_open);

/* Close network data base files and clear `stay open' flag.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern void endnetent (void);

/* Get next entry from network data base file.  Open data base if
   necessary.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct netent *getnetent (void);

/* Return entry from network data base which address match NET and
   type TYPE.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct netent *getnetbyaddr (uint32_t __net, int __type);

/* Return entry from network data base for network with NAME.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct netent *getnetbyname (__const char *__name);

#ifdef	__USE_MISC
/* Reentrant versions of the functions above.  The additional
   arguments specify a buffer of BUFLEN starting at BUF.  The last
   argument is a pointer to a variable which gets the value which
   would be stored in the global variable `herrno' by the
   non-reentrant functions.

   These functions are not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation they are cancellation points and
   therefore not marked with __THROW.  */
extern int getnetent_r (struct netent *__restrict __result_buf,
			char *__restrict __buf, size_t __buflen,
			struct netent **__restrict __result,
			int *__restrict __h_errnop);

extern int getnetbyaddr_r (uint32_t __net, int __type,
			   struct netent *__restrict __result_buf,
			   char *__restrict __buf, size_t __buflen,
			   struct netent **__restrict __result,
			   int *__restrict __h_errnop);

extern int getnetbyname_r (__const char *__restrict __name,
			   struct netent *__restrict __result_buf,
			   char *__restrict __buf, size_t __buflen,
			   struct netent **__restrict __result,
			   int *__restrict __h_errnop);
#endif	/* misc */


/* Description of data base entry for a single service.  */
struct servent
{
  char *s_name;			/* Official service name.  */
  char **s_aliases;		/* Alias list.  */
  int s_port;			/* Port number.  */
  char *s_proto;		/* Protocol to use.  */
};

/* Open service data base files and mark them as staying open even
   after a later search if STAY_OPEN is non-zero.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern void setservent (int __stay_open);

/* Close service data base files and clear `stay open' flag.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern void endservent (void);

/* Get next entry from service data base file.  Open data base if
   necessary.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct servent *getservent (void);

/* Return entry from network data base for network with NAME and
   protocol PROTO.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct servent *getservbyname (__const char *__name,
				      __const char *__proto);

/* Return entry from service data base which matches port PORT and
   protocol PROTO.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct servent *getservbyport (int __port, __const char *__proto);


#ifdef	__USE_MISC
/* Reentrant versions of the functions above.  The additional
   arguments specify a buffer of BUFLEN starting at BUF.

   These functions are not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation they are cancellation points and
   therefore not marked with __THROW.  */
extern int getservent_r (struct servent *__restrict __result_buf,
			 char *__restrict __buf, size_t __buflen,
			 struct servent **__restrict __result);

extern int getservbyname_r (__const char *__restrict __name,
			    __const char *__restrict __proto,
			    struct servent *__restrict __result_buf,
			    char *__restrict __buf, size_t __buflen,
			    struct servent **__restrict __result);

extern int getservbyport_r (int __port, __const char *__restrict __proto,
			    struct servent *__restrict __result_buf,
			    char *__restrict __buf, size_t __buflen,
			    struct servent **__restrict __result);
#endif	/* misc */


/* Description of data base entry for a single service.  */
struct protoent
{
  char *p_name;			/* Official protocol name.  */
  char **p_aliases;		/* Alias list.  */
  int p_proto;			/* Protocol number.  */
};

/* Open protocol data base files and mark them as staying open even
   after a later search if STAY_OPEN is non-zero.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern void setprotoent (int __stay_open);

/* Close protocol data base files and clear `stay open' flag.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern void endprotoent (void);

/* Get next entry from protocol data base file.  Open data base if
   necessary.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct protoent *getprotoent (void);

/* Return entry from protocol data base for network with NAME.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct protoent *getprotobyname (__const char *__name);

/* Return entry from protocol data base which number is PROTO.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct protoent *getprotobynumber (int __proto);


#ifdef	__USE_MISC
/* Reentrant versions of the functions above.  The additional
   arguments specify a buffer of BUFLEN starting at BUF.

   These functions are not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation they are cancellation points and
   therefore not marked with __THROW.  */
extern int getprotoent_r (struct protoent *__restrict __result_buf,
			  char *__restrict __buf, size_t __buflen,
			  struct protoent **__restrict __result);

extern int getprotobyname_r (__const char *__restrict __name,
			     struct protoent *__restrict __result_buf,
			     char *__restrict __buf, size_t __buflen,
			     struct protoent **__restrict __result);

extern int getprotobynumber_r (int __proto,
			       struct protoent *__restrict __result_buf,
			       char *__restrict __buf, size_t __buflen,
			       struct protoent **__restrict __result);


/* Establish network group NETGROUP for enumeration.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int setnetgrent (__const char *__netgroup);

/* Free all space allocated by previous `setnetgrent' call.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern void endnetgrent (void);

/* Get next member of netgroup established by last `setnetgrent' call
   and return pointers to elements in HOSTP, USERP, and DOMAINP.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int getnetgrent (char **__restrict __hostp,
			char **__restrict __userp,
			char **__restrict __domainp);


/* Test whether NETGROUP contains the triple (HOST,USER,DOMAIN).

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int innetgr (__const char *__netgroup, __const char *__host,
		    __const char *__user, __const char *domain);

/* Reentrant version of `getnetgrent' where result is placed in BUFFER.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int getnetgrent_r (char **__restrict __hostp,
			  char **__restrict __userp,
			  char **__restrict __domainp,
			  char *__restrict __buffer, size_t __buflen);
#endif	/* misc */


#ifdef __USE_BSD
/* Call `rshd' at port RPORT on remote machine *AHOST to execute CMD.
   The local user is LOCUSER, on the remote machine the command is
   executed as REMUSER.  In *FD2P the descriptor to the socket for the
   connection is returned.  The caller must have the right to use a
   reserved port.  When the function returns *AHOST contains the
   official host name.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rcmd (char **__restrict __ahost, unsigned short int __rport,
		 __const char *__restrict __locuser,
		 __const char *__restrict __remuser,
		 __const char *__restrict __cmd, int *__restrict __fd2p);

/* This is the equivalent function where the protocol can be selected
   and which therefore can be used for IPv6.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rcmd_af (char **__restrict __ahost, unsigned short int __rport,
		    __const char *__restrict __locuser,
		    __const char *__restrict __remuser,
		    __const char *__restrict __cmd, int *__restrict __fd2p,
		    sa_family_t __af);

/* Call `rexecd' at port RPORT on remote machine *AHOST to execute
   CMD.  The process runs at the remote machine using the ID of user
   NAME whose cleartext password is PASSWD.  In *FD2P the descriptor
   to the socket for the connection is returned.  When the function
   returns *AHOST contains the official host name.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rexec (char **__restrict __ahost, int __rport,
		  __const char *__restrict __name,
		  __const char *__restrict __pass,
		  __const char *__restrict __cmd, int *__restrict __fd2p);

/* This is the equivalent function where the protocol can be selected
   and which therefore can be used for IPv6.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rexec_af (char **__restrict __ahost, int __rport,
		     __const char *__restrict __name,
		     __const char *__restrict __pass,
		     __const char *__restrict __cmd, int *__restrict __fd2p,
		     sa_family_t __af);

/* Check whether user REMUSER on system RHOST is allowed to login as LOCUSER.
   If SUSER is not zero the user tries to become superuser.  Return 0 if
   it is possible.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int ruserok (__const char *__rhost, int __suser,
		    __const char *__remuser, __const char *__locuser);

/* This is the equivalent function where the protocol can be selected
   and which therefore can be used for IPv6.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int ruserok_af (__const char *__rhost, int __suser,
		       __const char *__remuser, __const char *__locuser,
		       sa_family_t __af);

/* Try to allocate reserved port, returning a descriptor for a socket opened
   at this port or -1 if unsuccessful.  The search for an available port
   will start at ALPORT and continues with lower numbers.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rresvport (int *__alport);

/* This is the equivalent function where the protocol can be selected
   and which therefore can be used for IPv6.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int rresvport_af (int *__alport, sa_family_t __af);
#endif


/* Extension from POSIX.1g.  */
#ifdef	__USE_POSIX
/* Structure to contain information about address of a service provider.  */
struct addrinfo
{
  int ai_flags;			/* Input flags.  */
  int ai_family;		/* Protocol family for socket.  */
  int ai_socktype;		/* Socket type.  */
  int ai_protocol;		/* Protocol for socket.  */
  socklen_t ai_addrlen;		/* Length of socket address.  */
  struct sockaddr *ai_addr;	/* Socket address for socket.  */
  char *ai_canonname;		/* Canonical name for service location.  */
  struct addrinfo *ai_next;	/* Pointer to next in list.  */
};

# ifdef __USE_GNU
/* Structure used as control block for asynchronous lookup.  */
struct gaicb
{
  const char *ar_name;		/* Name to look up.  */
  const char *ar_service;	/* Service name.  */
  const struct addrinfo *ar_request; /* Additional request specification.  */
  struct addrinfo *ar_result;	/* Pointer to result.  */
  /* The following are internal elements.  */
  int __return;
  int __unused[5];
};

/* Lookup mode.  */
#  define GAI_WAIT	0
#  define GAI_NOWAIT	1
# endif

/* Possible values for `ai_flags' field in `addrinfo' structure.  */
# define AI_PASSIVE	0x0001	/* Socket address is intended for `bind'.  */
# define AI_CANONNAME	0x0002	/* Request for canonical name.  */
# define AI_NUMERICHOST	0x0004	/* Don't use name resolution.  */
# define AI_V4MAPPED	0x0008	/* IPv4 mapped addresses are acceptable.  */
# define AI_ALL		0x0010	/* Return IPv4 mapped and IPv6 addresses.  */
# define AI_ADDRCONFIG	0x0020	/* Use configuration of this host to choose
				   returned address type..  */
# ifdef __USE_GNU
#  define AI_IDN	0x0040	/* IDN encode input (assuming it is encoded
				   in the current locale's character set)
				   before looking it up. */
#  define AI_CANONIDN	0x0080	/* Translate canonical name from IDN format. */
# endif

/* Error values for `getaddrinfo' function.  */
# define EAI_BADFLAGS	  -1	/* Invalid value for `ai_flags' field.  */
# define EAI_NONAME	  -2	/* NAME or SERVICE is unknown.  */
# define EAI_AGAIN	  -3	/* Temporary failure in name resolution.  */
# define EAI_FAIL	  -4	/* Non-recoverable failure in name res.  */
# define EAI_NODATA	  -5	/* No address associated with NAME.  */
# define EAI_FAMILY	  -6	/* `ai_family' not supported.  */
# define EAI_SOCKTYPE	  -7	/* `ai_socktype' not supported.  */
# define EAI_SERVICE	  -8	/* SERVICE not supported for `ai_socktype'.  */
# define EAI_ADDRFAMILY	  -9	/* Address family for NAME not supported.  */
# define EAI_MEMORY	  -10	/* Memory allocation failure.  */
# define EAI_SYSTEM	  -11	/* System error returned in `errno'.  */
# define EAI_OVERFLOW	  -12	/* Argument buffer overflow.  */
# ifdef __USE_GNU
#  define EAI_INPROGRESS  -100	/* Processing request in progress.  */
#  define EAI_CANCELED	  -101	/* Request canceled.  */
#  define EAI_NOTCANCELED -102	/* Request not canceled.  */
#  define EAI_ALLDONE	  -103	/* All requests done.  */
#  define EAI_INTR	  -104	/* Interrupted by a signal.  */
#  define EAI_IDN_ENCODE  -105	/* IDN encoding failed.  */
# endif

# define NI_MAXHOST      1025
# define NI_MAXSERV      32

# define NI_NUMERICHOST	1	/* Don't try to look up hostname.  */
# define NI_NUMERICSERV 2	/* Don't convert port number to name.  */
# define NI_NOFQDN	4	/* Only return nodename portion.  */
# define NI_NAMEREQD	8	/* Don't return numeric addresses.  */
# define NI_DGRAM	16	/* Look up UDP service rather than TCP.  */
# ifdef __USE_GNU
#  define NI_IDN	32	/* Convert name from IDN format.  */
# endif

/* Translate name of a service location and/or a service name to set of
   socket addresses.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern int getaddrinfo (__const char *__restrict __name,
			__const char *__restrict __service,
			__const struct addrinfo *__restrict __req,
			struct addrinfo **__restrict __pai);

/* Free `addrinfo' structure AI including associated storage.  */
extern void freeaddrinfo (struct addrinfo *__ai) __THROW;

/* Convert error return from getaddrinfo() to a string.  */
extern __const char *gai_strerror (int __ecode) __THROW;

/* Translate a socket address to a location and service name.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern int getnameinfo (__const struct sockaddr *__restrict __sa,
			socklen_t __salen, char *__restrict __host,
			socklen_t __hostlen, char *__restrict __serv,
			socklen_t __servlen, unsigned int __flags);
#endif	/* POSIX */

#ifdef __USE_GNU
/* Enqueue ENT requests from the LIST.  If MODE is GAI_WAIT wait until all
   requests are handled.  If WAIT is GAI_NOWAIT return immediately after
   queueing the requests and signal completion according to SIG.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int getaddrinfo_a (int __mode, struct gaicb *__list[__restrict_arr],
			  int __ent, struct sigevent *__restrict __sig);

/* Suspend execution of the thread until at least one of the ENT requests
   in LIST is handled.  If TIMEOUT is not a null pointer it specifies the
   longest time the function keeps waiting before returning with an error.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int gai_suspend (__const struct gaicb *__const __list[], int __ent,
			__const struct timespec *__timeout);

/* Get the error status of the request REQ.  */
extern int gai_error (struct gaicb *__req) __THROW;

/* Cancel the requests associated with GAICBP.  */
extern int gai_cancel (struct gaicb *__gaicbp) __THROW;
#endif	/* GNU */

__END_DECLS

#endif	/* netdb.h */