resolv/netdb.h

   1   /* Copyright (C) 1996-2004, 2009, 2010 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 /* All data returned by the network data base library are supplied in
  20    host order and returned in network order (suitable for use in
  21    system calls).  */
  22
  23 #ifndef _NETDB_H
  24 #define _NETDB_H        1
  25
  26 #include <features.h>
  27
  28 #include <netinet/in.h>
  29 #include <stdint.h>
  30 #ifdef __USE_MISC
  31 /* This is necessary to make this include file properly replace the
  32    Sun version.  */
  33 # include <rpc/netdb.h>
  34 #endif
  35
  36 #ifdef __USE_GNU
  37 # define __need_sigevent_t
  38 # include <bits/siginfo.h>
  39 # define __need_timespec
  40 # include <time.h>
  41 #endif
  42
  43 #include <bits/netdb.h>
  44
  45 /* Absolute file name for network data base files.  */
  46 #define _PATH_HEQUIV            "/etc/hosts.equiv"
  47 #define _PATH_HOSTS             "/etc/hosts"
  48 #define _PATH_NETWORKS          "/etc/networks"
  49 #define _PATH_NSSWITCH_CONF     "/etc/nsswitch.conf"
  50 #define _PATH_PROTOCOLS         "/etc/protocols"
  51 #define _PATH_SERVICES          "/etc/services"
  52
  53
  54 __BEGIN_DECLS
  55
  56 #if defined __USE_MISC || defined __USE_GNU || !defined __USE_XOPEN2K8
  57 /* Error status for non-reentrant lookup functions.
  58    We use a macro to access always the thread-specific `h_errno' variable.  */
  59 # define h_errno (*__h_errno_location ())
  60
  61 /* Function to get address of global `h_errno' variable.  */
  62 extern int *__h_errno_location (void) __THROW __attribute__ ((__const__));
  63
  64
  65 /* Possible values left in `h_errno'.  */
  66 # define HOST_NOT_FOUND 1       /* Authoritative Answer Host not found.  */
  67 # define TRY_AGAIN      2       /* Non-Authoritative Host not found,
  68                                    or SERVERFAIL.  */
  69 # define NO_RECOVERY    3       /* Non recoverable errors, FORMERR, REFUSED,
  70                                    NOTIMP.  */
  71 # define NO_DATA        4       /* Valid name, no data record of requested
  72                                    type.  */
  73 #endif
  74 #if defined __USE_MISC || defined __USE_GNU
  75 # define NETDB_INTERNAL -1      /* See errno.  */
  76 # define NETDB_SUCCESS  0       /* No problem.  */
  77 # define NO_ADDRESS     NO_DATA /* No address, look for MX record.  */
  78 #endif
  79
  80 #ifdef __USE_XOPEN2K
  81 /* Highest reserved Internet port number.  */
  82 # define IPPORT_RESERVED        1024
  83 #endif
  84
  85 #ifdef __USE_GNU
  86 /* Scope delimiter for getaddrinfo(), getnameinfo().  */
  87 # define SCOPE_DELIMITER        '%'
  88 #endif
  89
  90 #if defined __USE_MISC || defined __USE_GNU
  91 /* Print error indicated by `h_errno' variable on standard error.  STR
  92    if non-null is printed before the error string.  */
  93 extern void herror (__const char *__str) __THROW;
  94
  95 /* Return string associated with error ERR_NUM.  */
  96 extern __const char *hstrerror (int __err_num) __THROW;
  97 #endif
  98
  99
 100 /* Description of data base entry for a single host.  */
 101 struct hostent
 102 {
 103   char *h_name;                 /* Official name of host.  */
 104   char **h_aliases;             /* Alias list.  */
 105   int h_addrtype;               /* Host address type.  */
 106   int h_length;                 /* Length of address.  */
 107   char **h_addr_list;           /* List of addresses from name server.  */
 108 #if defined __USE_MISC || defined __USE_GNU
 109 # define        h_addr  h_addr_list[0] /* Address, for backward compatibility.*/
 110 #endif
 111 };
 112
 113 /* Open host data base files and mark them as staying open even after
 114    a later search if STAY_OPEN is non-zero.
 115
 116    This function is a possible cancellation point and therefore not
 117    marked with __THROW.  */
 118 extern void sethostent (int __stay_open);
 119
 120 /* Close host data base files and clear `stay open' flag.
 121
 122    This function is a possible cancellation point and therefore not
 123    marked with __THROW.  */
 124 extern void endhostent (void);
 125
 126 /* Get next entry from host data base file.  Open data base if
 127    necessary.
 128
 129    This function is a possible cancellation point and therefore not
 130    marked with __THROW.  */
 131 extern struct hostent *gethostent (void);
 132
 133 /* Return entry from host data base which address match ADDR with
 134    length LEN and type TYPE.
 135
 136    This function is a possible cancellation point and therefore not
 137    marked with __THROW.  */
 138 extern struct hostent *gethostbyaddr (__const void *__addr, __socklen_t __len,
 139                                       int __type);
 140
 141 /* Return entry from host data base for host with NAME.
 142
 143    This function is a possible cancellation point and therefore not
 144    marked with __THROW.  */
 145 extern struct hostent *gethostbyname (__const char *__name);
 146
 147 #ifdef __USE_MISC
 148 /* Return entry from host data base for host with NAME.  AF must be
 149    set to the address type which is `AF_INET' for IPv4 or `AF_INET6'
 150    for IPv6.
 151
 152    This function is not part of POSIX and therefore no official
 153    cancellation point.  But due to similarity with an POSIX interface
 154    or due to the implementation it is a cancellation point and
 155    therefore not marked with __THROW.  */
 156 extern struct hostent *gethostbyname2 (__const char *__name, int __af);
 157
 158 /* Reentrant versions of the functions above.  The additional
 159    arguments specify a buffer of BUFLEN starting at BUF.  The last
 160    argument is a pointer to a variable which gets the value which
 161    would be stored in the global variable `herrno' by the
 162    non-reentrant functions.
 163
 164    These functions are not part of POSIX and therefore no official
 165    cancellation point.  But due to similarity with an POSIX interface
 166    or due to the implementation they are cancellation points and
 167    therefore not marked with __THROW.  */
 168 extern int gethostent_r (struct hostent *__restrict __result_buf,
 169                          char *__restrict __buf, size_t __buflen,
 170                          struct hostent **__restrict __result,
 171                          int *__restrict __h_errnop);
 172
 173 extern int gethostbyaddr_r (__const void *__restrict __addr, __socklen_t __len,
 174                             int __type,
 175                             struct hostent *__restrict __result_buf,
 176                             char *__restrict __buf, size_t __buflen,
 177                             struct hostent **__restrict __result,
 178                             int *__restrict __h_errnop);
 179
 180 extern int gethostbyname_r (__const char *__restrict __name,
 181                             struct hostent *__restrict __result_buf,
 182                             char *__restrict __buf, size_t __buflen,
 183                             struct hostent **__restrict __result,
 184                             int *__restrict __h_errnop);
 185
 186 extern int gethostbyname2_r (__const char *__restrict __name, int __af,
 187                              struct hostent *__restrict __result_buf,
 188                              char *__restrict __buf, size_t __buflen,
 189                              struct hostent **__restrict __result,
 190                              int *__restrict __h_errnop);
 191 #endif  /* misc */
 192
 193
 194 /* Open network data base files and mark them as staying open even
 195    after a later search if STAY_OPEN is non-zero.
 196
 197    This function is a possible cancellation point and therefore not
 198    marked with __THROW.  */
 199 extern void setnetent (int __stay_open);
 200
 201 /* Close network data base files and clear `stay open' flag.
 202
 203    This function is a possible cancellation point and therefore not
 204    marked with __THROW.  */
 205 extern void endnetent (void);
 206
 207 /* Get next entry from network data base file.  Open data base if
 208    necessary.
 209
 210    This function is a possible cancellation point and therefore not
 211    marked with __THROW.  */
 212 extern struct netent *getnetent (void);
 213
 214 /* Return entry from network data base which address match NET and
 215    type TYPE.
 216
 217    This function is a possible cancellation point and therefore not
 218    marked with __THROW.  */
 219 extern struct netent *getnetbyaddr (uint32_t __net, int __type);
 220
 221 /* Return entry from network data base for network with NAME.
 222
 223    This function is a possible cancellation point and therefore not
 224    marked with __THROW.  */
 225 extern struct netent *getnetbyname (__const char *__name);
 226
 227 #ifdef  __USE_MISC
 228 /* Reentrant versions of the functions above.  The additional
 229    arguments specify a buffer of BUFLEN starting at BUF.  The last
 230    argument is a pointer to a variable which gets the value which
 231    would be stored in the global variable `herrno' by the
 232    non-reentrant functions.
 233
 234    These functions are not part of POSIX and therefore no official
 235    cancellation point.  But due to similarity with an POSIX interface
 236    or due to the implementation they are cancellation points and
 237    therefore not marked with __THROW.  */
 238 extern int getnetent_r (struct netent *__restrict __result_buf,
 239                         char *__restrict __buf, size_t __buflen,
 240                         struct netent **__restrict __result,
 241                         int *__restrict __h_errnop);
 242
 243 extern int getnetbyaddr_r (uint32_t __net, int __type,
 244                            struct netent *__restrict __result_buf,
 245                            char *__restrict __buf, size_t __buflen,
 246                            struct netent **__restrict __result,
 247                            int *__restrict __h_errnop);
 248
 249 extern int getnetbyname_r (__const char *__restrict __name,
 250                            struct netent *__restrict __result_buf,
 251                            char *__restrict __buf, size_t __buflen,
 252                            struct netent **__restrict __result,
 253                            int *__restrict __h_errnop);
 254 #endif  /* misc */
 255
 256
 257 /* Description of data base entry for a single service.  */
 258 struct servent
 259 {
 260   char *s_name;                 /* Official service name.  */
 261   char **s_aliases;             /* Alias list.  */
 262   int s_port;                   /* Port number.  */
 263   char *s_proto;                /* Protocol to use.  */
 264 };
 265
 266 /* Open service data base files and mark them as staying open even
 267    after a later search if STAY_OPEN is non-zero.
 268
 269    This function is a possible cancellation point and therefore not
 270    marked with __THROW.  */
 271 extern void setservent (int __stay_open);
 272
 273 /* Close service data base files and clear `stay open' flag.
 274
 275    This function is a possible cancellation point and therefore not
 276    marked with __THROW.  */
 277 extern void endservent (void);
 278
 279 /* Get next entry from service data base file.  Open data base if
 280    necessary.
 281
 282    This function is a possible cancellation point and therefore not
 283    marked with __THROW.  */
 284 extern struct servent *getservent (void);
 285
 286 /* Return entry from network data base for network with NAME and
 287    protocol PROTO.
 288
 289    This function is a possible cancellation point and therefore not
 290    marked with __THROW.  */
 291 extern struct servent *getservbyname (__const char *__name,
 292                                       __const char *__proto);
 293
 294 /* Return entry from service data base which matches port PORT and
 295    protocol PROTO.
 296
 297    This function is a possible cancellation point and therefore not
 298    marked with __THROW.  */
 299 extern struct servent *getservbyport (int __port, __const char *__proto);
 300
 301
 302 #ifdef  __USE_MISC
 303 /* Reentrant versions of the functions above.  The additional
 304    arguments specify a buffer of BUFLEN starting at BUF.
 305
 306    These functions are not part of POSIX and therefore no official
 307    cancellation point.  But due to similarity with an POSIX interface
 308    or due to the implementation they are cancellation points and
 309    therefore not marked with __THROW.  */
 310 extern int getservent_r (struct servent *__restrict __result_buf,
 311                          char *__restrict __buf, size_t __buflen,
 312                          struct servent **__restrict __result);
 313
 314 extern int getservbyname_r (__const char *__restrict __name,
 315                             __const char *__restrict __proto,
 316                             struct servent *__restrict __result_buf,
 317                             char *__restrict __buf, size_t __buflen,
 318                             struct servent **__restrict __result);
 319
 320 extern int getservbyport_r (int __port, __const char *__restrict __proto,
 321                             struct servent *__restrict __result_buf,
 322                             char *__restrict __buf, size_t __buflen,
 323                             struct servent **__restrict __result);
 324 #endif  /* misc */
 325
 326
 327 /* Description of data base entry for a single service.  */
 328 struct protoent
 329 {
 330   char *p_name;                 /* Official protocol name.  */
 331   char **p_aliases;             /* Alias list.  */
 332   int p_proto;                  /* Protocol number.  */
 333 };
 334
 335 /* Open protocol data base files and mark them as staying open even
 336    after a later search if STAY_OPEN is non-zero.
 337
 338    This function is a possible cancellation point and therefore not
 339    marked with __THROW.  */
 340 extern void setprotoent (int __stay_open);
 341
 342 /* Close protocol data base files and clear `stay open' flag.
 343
 344    This function is a possible cancellation point and therefore not
 345    marked with __THROW.  */
 346 extern void endprotoent (void);
 347
 348 /* Get next entry from protocol data base file.  Open data base if
 349    necessary.
 350
 351    This function is a possible cancellation point and therefore not
 352    marked with __THROW.  */
 353 extern struct protoent *getprotoent (void);
 354
 355 /* Return entry from protocol data base for network with NAME.
 356
 357    This function is a possible cancellation point and therefore not
 358    marked with __THROW.  */
 359 extern struct protoent *getprotobyname (__const char *__name);
 360
 361 /* Return entry from protocol data base which number is PROTO.
 362
 363    This function is a possible cancellation point and therefore not
 364    marked with __THROW.  */
 365 extern struct protoent *getprotobynumber (int __proto);
 366
 367
 368 #ifdef  __USE_MISC
 369 /* Reentrant versions of the functions above.  The additional
 370    arguments specify a buffer of BUFLEN starting at BUF.
 371
 372    These functions are not part of POSIX and therefore no official
 373    cancellation point.  But due to similarity with an POSIX interface
 374    or due to the implementation they are cancellation points and
 375    therefore not marked with __THROW.  */
 376 extern int getprotoent_r (struct protoent *__restrict __result_buf,
 377                           char *__restrict __buf, size_t __buflen,
 378                           struct protoent **__restrict __result);
 379
 380 extern int getprotobyname_r (__const char *__restrict __name,
 381                              struct protoent *__restrict __result_buf,
 382                              char *__restrict __buf, size_t __buflen,
 383                              struct protoent **__restrict __result);
 384
 385 extern int getprotobynumber_r (int __proto,
 386                                struct protoent *__restrict __result_buf,
 387                                char *__restrict __buf, size_t __buflen,
 388                                struct protoent **__restrict __result);
 389
 390
 391 /* Establish network group NETGROUP for enumeration.
 392
 393    This function is not part of POSIX and therefore no official
 394    cancellation point.  But due to similarity with an POSIX interface
 395    or due to the implementation it is a cancellation point and
 396    therefore not marked with __THROW.  */
 397 extern int setnetgrent (__const char *__netgroup);
 398
 399 /* Free all space allocated by previous `setnetgrent' call.
 400
 401    This function is not part of POSIX and therefore no official
 402    cancellation point.  But due to similarity with an POSIX interface
 403    or due to the implementation it is a cancellation point and
 404    therefore not marked with __THROW.  */
 405 extern void endnetgrent (void);
 406
 407 /* Get next member of netgroup established by last `setnetgrent' call
 408    and return pointers to elements in HOSTP, USERP, and DOMAINP.
 409
 410    This function is not part of POSIX and therefore no official
 411    cancellation point.  But due to similarity with an POSIX interface
 412    or due to the implementation it is a cancellation point and
 413    therefore not marked with __THROW.  */
 414 extern int getnetgrent (char **__restrict __hostp,
 415                         char **__restrict __userp,
 416                         char **__restrict __domainp);
 417
 418
 419 /* Test whether NETGROUP contains the triple (HOST,USER,DOMAIN).
 420
 421    This function is not part of POSIX and therefore no official
 422    cancellation point.  But due to similarity with an POSIX interface
 423    or due to the implementation it is a cancellation point and
 424    therefore not marked with __THROW.  */
 425 extern int innetgr (__const char *__netgroup, __const char *__host,
 426                     __const char *__user, __const char *__domain);
 427
 428 /* Reentrant version of `getnetgrent' where result is placed in BUFFER.
 429
 430    This function is not part of POSIX and therefore no official
 431    cancellation point.  But due to similarity with an POSIX interface
 432    or due to the implementation it is a cancellation point and
 433    therefore not marked with __THROW.  */
 434 extern int getnetgrent_r (char **__restrict __hostp,
 435                           char **__restrict __userp,
 436                           char **__restrict __domainp,
 437                           char *__restrict __buffer, size_t __buflen);
 438 #endif  /* misc */
 439
 440
 441 #ifdef __USE_BSD
 442 /* Call `rshd' at port RPORT on remote machine *AHOST to execute CMD.
 443    The local user is LOCUSER, on the remote machine the command is
 444    executed as REMUSER.  In *FD2P the descriptor to the socket for the
 445    connection is returned.  The caller must have the right to use a
 446    reserved port.  When the function returns *AHOST contains the
 447    official host name.
 448
 449    This function is not part of POSIX and therefore no official
 450    cancellation point.  But due to similarity with an POSIX interface
 451    or due to the implementation it is a cancellation point and
 452    therefore not marked with __THROW.  */
 453 extern int rcmd (char **__restrict __ahost, unsigned short int __rport,
 454                  __const char *__restrict __locuser,
 455                  __const char *__restrict __remuser,
 456                  __const char *__restrict __cmd, int *__restrict __fd2p);
 457
 458 /* This is the equivalent function where the protocol can be selected
 459    and which therefore can be used for IPv6.
 460
 461    This function is not part of POSIX and therefore no official
 462    cancellation point.  But due to similarity with an POSIX interface
 463    or due to the implementation it is a cancellation point and
 464    therefore not marked with __THROW.  */
 465 extern int rcmd_af (char **__restrict __ahost, unsigned short int __rport,
 466                     __const char *__restrict __locuser,
 467                     __const char *__restrict __remuser,
 468                     __const char *__restrict __cmd, int *__restrict __fd2p,
 469                     sa_family_t __af);
 470
 471 /* Call `rexecd' at port RPORT on remote machine *AHOST to execute
 472    CMD.  The process runs at the remote machine using the ID of user
 473    NAME whose cleartext password is PASSWD.  In *FD2P the descriptor
 474    to the socket for the connection is returned.  When the function
 475    returns *AHOST contains the official host name.
 476
 477    This function is not part of POSIX and therefore no official
 478    cancellation point.  But due to similarity with an POSIX interface
 479    or due to the implementation it is a cancellation point and
 480    therefore not marked with __THROW.  */
 481 extern int rexec (char **__restrict __ahost, int __rport,
 482                   __const char *__restrict __name,
 483                   __const char *__restrict __pass,
 484                   __const char *__restrict __cmd, int *__restrict __fd2p);
 485
 486 /* This is the equivalent function where the protocol can be selected
 487    and which therefore can be used for IPv6.
 488
 489    This function is not part of POSIX and therefore no official
 490    cancellation point.  But due to similarity with an POSIX interface
 491    or due to the implementation it is a cancellation point and
 492    therefore not marked with __THROW.  */
 493 extern int rexec_af (char **__restrict __ahost, int __rport,
 494                      __const char *__restrict __name,
 495                      __const char *__restrict __pass,
 496                      __const char *__restrict __cmd, int *__restrict __fd2p,
 497                      sa_family_t __af);
 498
 499 /* Check whether user REMUSER on system RHOST is allowed to login as LOCUSER.
 500    If SUSER is not zero the user tries to become superuser.  Return 0 if
 501    it is possible.
 502
 503    This function is not part of POSIX and therefore no official
 504    cancellation point.  But due to similarity with an POSIX interface
 505    or due to the implementation it is a cancellation point and
 506    therefore not marked with __THROW.  */
 507 extern int ruserok (__const char *__rhost, int __suser,
 508                     __const char *__remuser, __const char *__locuser);
 509
 510 /* This is the equivalent function where the protocol can be selected
 511    and which therefore can be used for IPv6.
 512
 513    This function is not part of POSIX and therefore no official
 514    cancellation point.  But due to similarity with an POSIX interface
 515    or due to the implementation it is a cancellation point and
 516    therefore not marked with __THROW.  */
 517 extern int ruserok_af (__const char *__rhost, int __suser,
 518                        __const char *__remuser, __const char *__locuser,
 519                        sa_family_t __af);
 520
 521 /* Try to allocate reserved port, returning a descriptor for a socket opened
 522    at this port or -1 if unsuccessful.  The search for an available port
 523    will start at ALPORT and continues with lower numbers.
 524
 525    This function is not part of POSIX and therefore no official
 526    cancellation point.  But due to similarity with an POSIX interface
 527    or due to the implementation it is a cancellation point and
 528    therefore not marked with __THROW.  */
 529 extern int rresvport (int *__alport);
 530
 531 /* This is the equivalent function where the protocol can be selected
 532    and which therefore can be used for IPv6.
 533
 534    This function is not part of POSIX and therefore no official
 535    cancellation point.  But due to similarity with an POSIX interface
 536    or due to the implementation it is a cancellation point and
 537    therefore not marked with __THROW.  */
 538 extern int rresvport_af (int *__alport, sa_family_t __af);
 539 #endif
 540
 541
 542 /* Extension from POSIX.1g.  */
 543 #ifdef  __USE_POSIX
 544 /* Structure to contain information about address of a service provider.  */
 545 struct addrinfo
 546 {
 547   int ai_flags;                 /* Input flags.  */
 548   int ai_family;                /* Protocol family for socket.  */
 549   int ai_socktype;              /* Socket type.  */
 550   int ai_protocol;              /* Protocol for socket.  */
 551   socklen_t ai_addrlen;         /* Length of socket address.  */
 552   struct sockaddr *ai_addr;     /* Socket address for socket.  */
 553   char *ai_canonname;           /* Canonical name for service location.  */
 554   struct addrinfo *ai_next;     /* Pointer to next in list.  */
 555 };
 556
 557 # ifdef __USE_GNU
 558 /* Structure used as control block for asynchronous lookup.  */
 559 struct gaicb
 560 {
 561   const char *ar_name;          /* Name to look up.  */
 562   const char *ar_service;       /* Service name.  */
 563   const struct addrinfo *ar_request; /* Additional request specification.  */
 564   struct addrinfo *ar_result;   /* Pointer to result.  */
 565   /* The following are internal elements.  */
 566   int __return;
 567   int __unused[5];
 568 };
 569
 570 /* Lookup mode.  */
 571 #  define GAI_WAIT      0
 572 #  define GAI_NOWAIT    1
 573 # endif
 574
 575 /* Possible values for `ai_flags' field in `addrinfo' structure.  */
 576 # define AI_PASSIVE     0x0001  /* Socket address is intended for `bind'.  */
 577 # define AI_CANONNAME   0x0002  /* Request for canonical name.  */
 578 # define AI_NUMERICHOST 0x0004  /* Don't use name resolution.  */
 579 # define AI_V4MAPPED    0x0008  /* IPv4 mapped addresses are acceptable.  */
 580 # define AI_ALL         0x0010  /* Return IPv4 mapped and IPv6 addresses.  */
 581 # define AI_ADDRCONFIG  0x0020  /* Use configuration of this host to choose
 582                                    returned address type..  */
 583 # ifdef __USE_GNU
 584 #  define AI_IDN        0x0040  /* IDN encode input (assuming it is encoded
 585                                    in the current locale's character set)
 586                                    before looking it up. */
 587 #  define AI_CANONIDN   0x0080  /* Translate canonical name from IDN format. */
 588 #  define AI_IDN_ALLOW_UNASSIGNED 0x0100 /* Don't reject unassigned Unicode
 589                                             code points.  */
 590 #  define AI_IDN_USE_STD3_ASCII_RULES 0x0200 /* Validate strings according to
 591                                                 STD3 rules.  */
 592 # endif
 593 # define AI_NUMERICSERV 0x0400  /* Don't use name resolution.  */
 594
 595 /* Error values for `getaddrinfo' function.  */
 596 # define EAI_BADFLAGS     -1    /* Invalid value for `ai_flags' field.  */
 597 # define EAI_NONAME       -2    /* NAME or SERVICE is unknown.  */
 598 # define EAI_AGAIN        -3    /* Temporary failure in name resolution.  */
 599 # define EAI_FAIL         -4    /* Non-recoverable failure in name res.  */
 600 # define EAI_FAMILY       -6    /* `ai_family' not supported.  */
 601 # define EAI_SOCKTYPE     -7    /* `ai_socktype' not supported.  */
 602 # define EAI_SERVICE      -8    /* SERVICE not supported for `ai_socktype'.  */
 603 # define EAI_MEMORY       -10   /* Memory allocation failure.  */
 604 # define EAI_SYSTEM       -11   /* System error returned in `errno'.  */
 605 # define EAI_OVERFLOW     -12   /* Argument buffer overflow.  */
 606 # ifdef __USE_GNU
 607 #  define EAI_NODATA      -5    /* No address associated with NAME.  */
 608 #  define EAI_ADDRFAMILY  -9    /* Address family for NAME not supported.  */
 609 #  define EAI_INPROGRESS  -100  /* Processing request in progress.  */
 610 #  define EAI_CANCELED    -101  /* Request canceled.  */
 611 #  define EAI_NOTCANCELED -102  /* Request not canceled.  */
 612 #  define EAI_ALLDONE     -103  /* All requests done.  */
 613 #  define EAI_INTR        -104  /* Interrupted by a signal.  */
 614 #  define EAI_IDN_ENCODE  -105  /* IDN encoding failed.  */
 615 # endif
 616
 617 # ifdef __USE_MISC
 618 #  define NI_MAXHOST      1025
 619 #  define NI_MAXSERV      32
 620 # endif
 621
 622 # define NI_NUMERICHOST 1       /* Don't try to look up hostname.  */
 623 # define NI_NUMERICSERV 2       /* Don't convert port number to name.  */
 624 # define NI_NOFQDN      4       /* Only return nodename portion.  */
 625 # define NI_NAMEREQD    8       /* Don't return numeric addresses.  */
 626 # define NI_DGRAM       16      /* Look up UDP service rather than TCP.  */
 627 # ifdef __USE_GNU
 628 #  define NI_IDN        32      /* Convert name from IDN format.  */
 629 #  define NI_IDN_ALLOW_UNASSIGNED 64 /* Don't reject unassigned Unicode
 630                                         code points.  */
 631 #  define NI_IDN_USE_STD3_ASCII_RULES 128 /* Validate strings according to
 632                                              STD3 rules.  */
 633 # endif
 634
 635 /* Translate name of a service location and/or a service name to set of
 636    socket addresses.
 637
 638    This function is a possible cancellation point and therefore not
 639    marked with __THROW.  */
 640 extern int getaddrinfo (__const char *__restrict __name,
 641                         __const char *__restrict __service,
 642                         __const struct addrinfo *__restrict __req,
 643                         struct addrinfo **__restrict __pai);
 644
 645 /* Free `addrinfo' structure AI including associated storage.  */
 646 extern void freeaddrinfo (struct addrinfo *__ai) __THROW;
 647
 648 /* Convert error return from getaddrinfo() to a string.  */
 649 extern __const char *gai_strerror (int __ecode) __THROW;
 650
 651 /* Translate a socket address to a location and service name.
 652
 653    This function is a possible cancellation point and therefore not
 654    marked with __THROW.  */
 655 extern int getnameinfo (__const struct sockaddr *__restrict __sa,
 656                         socklen_t __salen, char *__restrict __host,
 657                         socklen_t __hostlen, char *__restrict __serv,
 658                         socklen_t __servlen, unsigned int __flags);
 659 #endif  /* POSIX */
 660
 661 #ifdef __USE_GNU
 662 /* Enqueue ENT requests from the LIST.  If MODE is GAI_WAIT wait until all
 663    requests are handled.  If WAIT is GAI_NOWAIT return immediately after
 664    queueing the requests and signal completion according to SIG.
 665
 666    This function is not part of POSIX and therefore no official
 667    cancellation point.  But due to similarity with an POSIX interface
 668    or due to the implementation it is a cancellation point and
 669    therefore not marked with __THROW.  */
 670 extern int getaddrinfo_a (int __mode, struct gaicb *__list[__restrict_arr],
 671                           int __ent, struct sigevent *__restrict __sig);
 672
 673 /* Suspend execution of the thread until at least one of the ENT requests
 674    in LIST is handled.  If TIMEOUT is not a null pointer it specifies the
 675    longest time the function keeps waiting before returning with an error.
 676
 677    This function is not part of POSIX and therefore no official
 678    cancellation point.  But due to similarity with an POSIX interface
 679    or due to the implementation it is a cancellation point and
 680    therefore not marked with __THROW.  */
 681 extern int gai_suspend (__const struct gaicb *__const __list[], int __ent,
 682                         __const struct timespec *__timeout);
 683
 684 /* Get the error status of the request REQ.  */
 685 extern int gai_error (struct gaicb *__req) __THROW;
 686
 687 /* Cancel the requests associated with GAICBP.  */
 688 extern int gai_cancel (struct gaicb *__gaicbp) __THROW;
 689 #endif  /* GNU */
 690
 691 __END_DECLS
 692
 693 #endif  /* netdb.h */