resolv/netdb.h

   1   /* Copyright (C) 1996-2016 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /* All data returned by the network data base library are supplied in
  19    host order and returned in network order (suitable for use in
  20    system calls).  */
  21
  22 #ifndef _NETDB_H
  23 #define _NETDB_H        1
  24
  25 #include <features.h>
  26
  27 #include <netinet/in.h>
  28 #include <stdint.h>
  29 #ifdef __USE_MISC
  30 /* This is necessary to make this include file properly replace the
  31    Sun version.  */
  32 # include <rpc/netdb.h>
  33 #endif
  34
  35 #ifdef __USE_GNU
  36 # define __need_sigevent_t
  37 # include <bits/siginfo.h>
  38 # define __need_timespec
  39 # include <time.h>
  40 #endif
  41
  42 #include <bits/netdb.h>
  43
  44 /* Absolute file name for network data base files.  */
  45 #define _PATH_HEQUIV            "/etc/hosts.equiv"
  46 #define _PATH_HOSTS             "/etc/hosts"
  47 #define _PATH_NETWORKS          "/etc/networks"
  48 #define _PATH_NSSWITCH_CONF     "/etc/nsswitch.conf"
  49 #define _PATH_PROTOCOLS         "/etc/protocols"
  50 #define _PATH_SERVICES          "/etc/services"
  51
  52
  53 __BEGIN_DECLS
  54
  55 #if defined __USE_MISC || !defined __USE_XOPEN2K8
  56 /* Error status for non-reentrant lookup functions.
  57    We use a macro to access always the thread-specific `h_errno' variable.  */
  58 # define h_errno (*__h_errno_location ())
  59
  60 /* Function to get address of global `h_errno' variable.  */
  61 extern int *__h_errno_location (void) __THROW __attribute__ ((__const__));
  62
  63
  64 /* Possible values left in `h_errno'.  */
  65 # define HOST_NOT_FOUND 1       /* Authoritative Answer Host not found.  */
  66 # define TRY_AGAIN      2       /* Non-Authoritative Host not found,
  67                                    or SERVERFAIL.  */
  68 # define NO_RECOVERY    3       /* Non recoverable errors, FORMERR, REFUSED,
  69                                    NOTIMP.  */
  70 # define NO_DATA        4       /* Valid name, no data record of requested
  71                                    type.  */
  72 #endif
  73 #ifdef __USE_MISC
  74 # define NETDB_INTERNAL -1      /* See errno.  */
  75 # define NETDB_SUCCESS  0       /* No problem.  */
  76 # define NO_ADDRESS     NO_DATA /* No address, look for MX record.  */
  77 #endif
  78
  79 #if defined __USE_XOPEN2K || defined __USE_XOPEN_EXTENDED
  80 /* Highest reserved Internet port number.  */
  81 # define IPPORT_RESERVED        1024
  82 #endif
  83
  84 #ifdef __USE_GNU
  85 /* Scope delimiter for getaddrinfo(), getnameinfo().  */
  86 # define SCOPE_DELIMITER        '%'
  87 #endif
  88
  89 #ifdef __USE_MISC
  90 /* Print error indicated by `h_errno' variable on standard error.  STR
  91    if non-null is printed before the error string.  */
  92 extern void herror (const char *__str) __THROW;
  93
  94 /* Return string associated with error ERR_NUM.  */
  95 extern const char *hstrerror (int __err_num) __THROW;
  96 #endif
  97
  98
  99 /* Description of data base entry for a single host.  */
 100 struct hostent
 101 {
 102   char *h_name;                 /* Official name of host.  */
 103   char **h_aliases;             /* Alias list.  */
 104   int h_addrtype;               /* Host address type.  */
 105   int h_length;                 /* Length of address.  */
 106   char **h_addr_list;           /* List of addresses from name server.  */
 107 #ifdef __USE_MISC
 108 # define        h_addr  h_addr_list[0] /* Address, for backward compatibility.*/
 109 #endif
 110 };
 111
 112 /* Open host data base files and mark them as staying open even after
 113    a later search if STAY_OPEN is non-zero.
 114
 115    This function is a possible cancellation point and therefore not
 116    marked with __THROW.  */
 117 extern void sethostent (int __stay_open);
 118
 119 /* Close host data base files and clear `stay open' flag.
 120
 121    This function is a possible cancellation point and therefore not
 122    marked with __THROW.  */
 123 extern void endhostent (void);
 124
 125 /* Get next entry from host data base file.  Open data base if
 126    necessary.
 127
 128    This function is a possible cancellation point and therefore not
 129    marked with __THROW.  */
 130 extern struct hostent *gethostent (void);
 131
 132 /* Return entry from host data base which address match ADDR with
 133    length LEN and type TYPE.
 134
 135    This function is a possible cancellation point and therefore not
 136    marked with __THROW.  */
 137 extern struct hostent *gethostbyaddr (const void *__addr, __socklen_t __len,
 138                                       int __type);
 139
 140 /* Return entry from host data base for host with NAME.
 141
 142    This function is a possible cancellation point and therefore not
 143    marked with __THROW.  */
 144 extern struct hostent *gethostbyname (const char *__name);
 145
 146 #ifdef __USE_MISC
 147 /* Return entry from host data base for host with NAME.  AF must be
 148    set to the address type which is `AF_INET' for IPv4 or `AF_INET6'
 149    for IPv6.
 150
 151    This function is not part of POSIX and therefore no official
 152    cancellation point.  But due to similarity with an POSIX interface
 153    or due to the implementation it is a cancellation point and
 154    therefore not marked with __THROW.  */
 155 extern struct hostent *gethostbyname2 (const char *__name, int __af);
 156
 157 /* Reentrant versions of the functions above.  The additional
 158    arguments specify a buffer of BUFLEN starting at BUF.  The last
 159    argument is a pointer to a variable which gets the value which
 160    would be stored in the global variable `herrno' by the
 161    non-reentrant functions.
 162
 163    These functions are not part of POSIX and therefore no official
 164    cancellation point.  But due to similarity with an POSIX interface
 165    or due to the implementation they are cancellation points and
 166    therefore not marked with __THROW.  */
 167 extern int gethostent_r (struct hostent *__restrict __result_buf,
 168                          char *__restrict __buf, size_t __buflen,
 169                          struct hostent **__restrict __result,
 170                          int *__restrict __h_errnop);
 171
 172 extern int gethostbyaddr_r (const void *__restrict __addr, __socklen_t __len,
 173                             int __type,
 174                             struct hostent *__restrict __result_buf,
 175                             char *__restrict __buf, size_t __buflen,
 176                             struct hostent **__restrict __result,
 177                             int *__restrict __h_errnop);
 178
 179 extern int gethostbyname_r (const char *__restrict __name,
 180                             struct hostent *__restrict __result_buf,
 181                             char *__restrict __buf, size_t __buflen,
 182                             struct hostent **__restrict __result,
 183                             int *__restrict __h_errnop);
 184
 185 extern int gethostbyname2_r (const char *__restrict __name, int __af,
 186                              struct hostent *__restrict __result_buf,
 187                              char *__restrict __buf, size_t __buflen,
 188                              struct hostent **__restrict __result,
 189                              int *__restrict __h_errnop);
 190 #endif  /* misc */
 191
 192
 193 /* Open network data base files and mark them as staying open even
 194    after a later search if STAY_OPEN is non-zero.
 195
 196    This function is a possible cancellation point and therefore not
 197    marked with __THROW.  */
 198 extern void setnetent (int __stay_open);
 199
 200 /* Close network data base files and clear `stay open' flag.
 201
 202    This function is a possible cancellation point and therefore not
 203    marked with __THROW.  */
 204 extern void endnetent (void);
 205
 206 /* Get next entry from network data base file.  Open data base if
 207    necessary.
 208
 209    This function is a possible cancellation point and therefore not
 210    marked with __THROW.  */
 211 extern struct netent *getnetent (void);
 212
 213 /* Return entry from network data base which address match NET and
 214    type TYPE.
 215
 216    This function is a possible cancellation point and therefore not
 217    marked with __THROW.  */
 218 extern struct netent *getnetbyaddr (uint32_t __net, int __type);
 219
 220 /* Return entry from network data base for network with NAME.
 221
 222    This function is a possible cancellation point and therefore not
 223    marked with __THROW.  */
 224 extern struct netent *getnetbyname (const char *__name);
 225
 226 #ifdef  __USE_MISC
 227 /* Reentrant versions of the functions above.  The additional
 228    arguments specify a buffer of BUFLEN starting at BUF.  The last
 229    argument is a pointer to a variable which gets the value which
 230    would be stored in the global variable `herrno' by the
 231    non-reentrant functions.
 232
 233    These functions are not part of POSIX and therefore no official
 234    cancellation point.  But due to similarity with an POSIX interface
 235    or due to the implementation they are cancellation points and
 236    therefore not marked with __THROW.  */
 237 extern int getnetent_r (struct netent *__restrict __result_buf,
 238                         char *__restrict __buf, size_t __buflen,
 239                         struct netent **__restrict __result,
 240                         int *__restrict __h_errnop);
 241
 242 extern int getnetbyaddr_r (uint32_t __net, int __type,
 243                            struct netent *__restrict __result_buf,
 244                            char *__restrict __buf, size_t __buflen,
 245                            struct netent **__restrict __result,
 246                            int *__restrict __h_errnop);
 247
 248 extern int getnetbyname_r (const char *__restrict __name,
 249                            struct netent *__restrict __result_buf,
 250                            char *__restrict __buf, size_t __buflen,
 251                            struct netent **__restrict __result,
 252                            int *__restrict __h_errnop);
 253 #endif  /* misc */
 254
 255
 256 /* Description of data base entry for a single service.  */
 257 struct servent
 258 {
 259   char *s_name;                 /* Official service name.  */
 260   char **s_aliases;             /* Alias list.  */
 261   int s_port;                   /* Port number.  */
 262   char *s_proto;                /* Protocol to use.  */
 263 };
 264
 265 /* Open service data base files and mark them as staying open even
 266    after a later search if STAY_OPEN is non-zero.
 267
 268    This function is a possible cancellation point and therefore not
 269    marked with __THROW.  */
 270 extern void setservent (int __stay_open);
 271
 272 /* Close service data base files and clear `stay open' flag.
 273
 274    This function is a possible cancellation point and therefore not
 275    marked with __THROW.  */
 276 extern void endservent (void);
 277
 278 /* Get next entry from service data base file.  Open data base if
 279    necessary.
 280
 281    This function is a possible cancellation point and therefore not
 282    marked with __THROW.  */
 283 extern struct servent *getservent (void);
 284
 285 /* Return entry from network data base for network with NAME and
 286    protocol PROTO.
 287
 288    This function is a possible cancellation point and therefore not
 289    marked with __THROW.  */
 290 extern struct servent *getservbyname (const char *__name, const char *__proto);
 291
 292 /* Return entry from service data base which matches port PORT and
 293    protocol PROTO.
 294
 295    This function is a possible cancellation point and therefore not
 296    marked with __THROW.  */
 297 extern struct servent *getservbyport (int __port, const char *__proto);
 298
 299
 300 #ifdef  __USE_MISC
 301 /* Reentrant versions of the functions above.  The additional
 302    arguments specify a buffer of BUFLEN starting at BUF.
 303
 304    These functions are not part of POSIX and therefore no official
 305    cancellation point.  But due to similarity with an POSIX interface
 306    or due to the implementation they are cancellation points and
 307    therefore not marked with __THROW.  */
 308 extern int getservent_r (struct servent *__restrict __result_buf,
 309                          char *__restrict __buf, size_t __buflen,
 310                          struct servent **__restrict __result);
 311
 312 extern int getservbyname_r (const char *__restrict __name,
 313                             const char *__restrict __proto,
 314                             struct servent *__restrict __result_buf,
 315                             char *__restrict __buf, size_t __buflen,
 316                             struct servent **__restrict __result);
 317
 318 extern int getservbyport_r (int __port, const char *__restrict __proto,
 319                             struct servent *__restrict __result_buf,
 320                             char *__restrict __buf, size_t __buflen,
 321                             struct servent **__restrict __result);
 322 #endif  /* misc */
 323
 324
 325 /* Description of data base entry for a single service.  */
 326 struct protoent
 327 {
 328   char *p_name;                 /* Official protocol name.  */
 329   char **p_aliases;             /* Alias list.  */
 330   int p_proto;                  /* Protocol number.  */
 331 };
 332
 333 /* Open protocol data base files and mark them as staying open even
 334    after a later search if STAY_OPEN is non-zero.
 335
 336    This function is a possible cancellation point and therefore not
 337    marked with __THROW.  */
 338 extern void setprotoent (int __stay_open);
 339
 340 /* Close protocol data base files and clear `stay open' flag.
 341
 342    This function is a possible cancellation point and therefore not
 343    marked with __THROW.  */
 344 extern void endprotoent (void);
 345
 346 /* Get next entry from protocol data base file.  Open data base if
 347    necessary.
 348
 349    This function is a possible cancellation point and therefore not
 350    marked with __THROW.  */
 351 extern struct protoent *getprotoent (void);
 352
 353 /* Return entry from protocol data base for network with NAME.
 354
 355    This function is a possible cancellation point and therefore not
 356    marked with __THROW.  */
 357 extern struct protoent *getprotobyname (const char *__name);
 358
 359 /* Return entry from protocol data base which number is PROTO.
 360
 361    This function is a possible cancellation point and therefore not
 362    marked with __THROW.  */
 363 extern struct protoent *getprotobynumber (int __proto);
 364
 365
 366 #ifdef  __USE_MISC
 367 /* Reentrant versions of the functions above.  The additional
 368    arguments specify a buffer of BUFLEN starting at BUF.
 369
 370    These functions are not part of POSIX and therefore no official
 371    cancellation point.  But due to similarity with an POSIX interface
 372    or due to the implementation they are cancellation points and
 373    therefore not marked with __THROW.  */
 374 extern int getprotoent_r (struct protoent *__restrict __result_buf,
 375                           char *__restrict __buf, size_t __buflen,
 376                           struct protoent **__restrict __result);
 377
 378 extern int getprotobyname_r (const char *__restrict __name,
 379                              struct protoent *__restrict __result_buf,
 380                              char *__restrict __buf, size_t __buflen,
 381                              struct protoent **__restrict __result);
 382
 383 extern int getprotobynumber_r (int __proto,
 384                                struct protoent *__restrict __result_buf,
 385                                char *__restrict __buf, size_t __buflen,
 386                                struct protoent **__restrict __result);
 387
 388
 389 /* Establish network group NETGROUP for enumeration.
 390
 391    This function is not part of POSIX and therefore no official
 392    cancellation point.  But due to similarity with an POSIX interface
 393    or due to the implementation it is a cancellation point and
 394    therefore not marked with __THROW.  */
 395 extern int setnetgrent (const char *__netgroup);
 396
 397 /* Free all space allocated by previous `setnetgrent' call.
 398
 399    This function is not part of POSIX and therefore no official
 400    cancellation point.  But due to similarity with an POSIX interface
 401    or due to the implementation it is a cancellation point and
 402    therefore not marked with __THROW.  */
 403 extern void endnetgrent (void);
 404
 405 /* Get next member of netgroup established by last `setnetgrent' call
 406    and return pointers to elements in HOSTP, USERP, and DOMAINP.
 407
 408    This function is not part of POSIX and therefore no official
 409    cancellation point.  But due to similarity with an POSIX interface
 410    or due to the implementation it is a cancellation point and
 411    therefore not marked with __THROW.  */
 412 extern int getnetgrent (char **__restrict __hostp,
 413                         char **__restrict __userp,
 414                         char **__restrict __domainp);
 415
 416
 417 /* Test whether NETGROUP contains the triple (HOST,USER,DOMAIN).
 418
 419    This function is not part of POSIX and therefore no official
 420    cancellation point.  But due to similarity with an POSIX interface
 421    or due to the implementation it is a cancellation point and
 422    therefore not marked with __THROW.  */
 423 extern int innetgr (const char *__netgroup, const char *__host,
 424                     const char *__user, const char *__domain);
 425
 426 /* Reentrant version of `getnetgrent' where result is placed in BUFFER.
 427
 428    This function is not part of POSIX and therefore no official
 429    cancellation point.  But due to similarity with an POSIX interface
 430    or due to the implementation it is a cancellation point and
 431    therefore not marked with __THROW.  */
 432 extern int getnetgrent_r (char **__restrict __hostp,
 433                           char **__restrict __userp,
 434                           char **__restrict __domainp,
 435                           char *__restrict __buffer, size_t __buflen);
 436 #endif  /* misc */
 437
 438
 439 #ifdef __USE_MISC
 440 /* Call `rshd' at port RPORT on remote machine *AHOST to execute CMD.
 441    The local user is LOCUSER, on the remote machine the command is
 442    executed as REMUSER.  In *FD2P the descriptor to the socket for the
 443    connection is returned.  The caller must have the right to use a
 444    reserved port.  When the function returns *AHOST contains the
 445    official host name.
 446
 447    This function is not part of POSIX and therefore no official
 448    cancellation point.  But due to similarity with an POSIX interface
 449    or due to the implementation it is a cancellation point and
 450    therefore not marked with __THROW.  */
 451 extern int rcmd (char **__restrict __ahost, unsigned short int __rport,
 452                  const char *__restrict __locuser,
 453                  const char *__restrict __remuser,
 454                  const char *__restrict __cmd, int *__restrict __fd2p);
 455
 456 /* This is the equivalent function where the protocol can be selected
 457    and which therefore can be used for IPv6.
 458
 459    This function is not part of POSIX and therefore no official
 460    cancellation point.  But due to similarity with an POSIX interface
 461    or due to the implementation it is a cancellation point and
 462    therefore not marked with __THROW.  */
 463 extern int rcmd_af (char **__restrict __ahost, unsigned short int __rport,
 464                     const char *__restrict __locuser,
 465                     const char *__restrict __remuser,
 466                     const char *__restrict __cmd, int *__restrict __fd2p,
 467                     sa_family_t __af);
 468
 469 /* Call `rexecd' at port RPORT on remote machine *AHOST to execute
 470    CMD.  The process runs at the remote machine using the ID of user
 471    NAME whose cleartext password is PASSWD.  In *FD2P the descriptor
 472    to the socket for the connection is returned.  When the function
 473    returns *AHOST contains the official host name.
 474
 475    This function is not part of POSIX and therefore no official
 476    cancellation point.  But due to similarity with an POSIX interface
 477    or due to the implementation it is a cancellation point and
 478    therefore not marked with __THROW.  */
 479 extern int rexec (char **__restrict __ahost, int __rport,
 480                   const char *__restrict __name,
 481                   const char *__restrict __pass,
 482                   const char *__restrict __cmd, int *__restrict __fd2p);
 483
 484 /* This is the equivalent function where the protocol can be selected
 485    and which therefore can be used for IPv6.
 486
 487    This function is not part of POSIX and therefore no official
 488    cancellation point.  But due to similarity with an POSIX interface
 489    or due to the implementation it is a cancellation point and
 490    therefore not marked with __THROW.  */
 491 extern int rexec_af (char **__restrict __ahost, int __rport,
 492                      const char *__restrict __name,
 493                      const char *__restrict __pass,
 494                      const char *__restrict __cmd, int *__restrict __fd2p,
 495                      sa_family_t __af);
 496
 497 /* Check whether user REMUSER on system RHOST is allowed to login as LOCUSER.
 498    If SUSER is not zero the user tries to become superuser.  Return 0 if
 499    it is possible.
 500
 501    This function is not part of POSIX and therefore no official
 502    cancellation point.  But due to similarity with an POSIX interface
 503    or due to the implementation it is a cancellation point and
 504    therefore not marked with __THROW.  */
 505 extern int ruserok (const char *__rhost, int __suser,
 506                     const char *__remuser, const char *__locuser);
 507
 508 /* This is the equivalent function where the protocol can be selected
 509    and which therefore can be used for IPv6.
 510
 511    This function is not part of POSIX and therefore no official
 512    cancellation point.  But due to similarity with an POSIX interface
 513    or due to the implementation it is a cancellation point and
 514    therefore not marked with __THROW.  */
 515 extern int ruserok_af (const char *__rhost, int __suser,
 516                        const char *__remuser, const char *__locuser,
 517                        sa_family_t __af);
 518
 519 /* Check whether user REMUSER on system indicated by IPv4 address
 520    RADDR is allowed to login as LOCUSER.  Non-IPv4 (e.g., IPv6) are
 521    not supported.  If SUSER is not zero the user tries to become
 522    superuser.  Return 0 if it is possible.
 523
 524    This function is not part of POSIX and therefore no official
 525    cancellation point.  But due to similarity with an POSIX interface
 526    or due to the implementation it is a cancellation point and
 527    therefore not marked with __THROW.  */
 528 extern int iruserok (uint32_t __raddr, int __suser,
 529                      const char *__remuser, const char *__locuser);
 530
 531 /* This is the equivalent function where the pfamiliy if the address
 532    pointed to by RADDR is determined by the value of AF.  It therefore
 533    can be used for IPv6
 534
 535    This function is not part of POSIX and therefore no official
 536    cancellation point.  But due to similarity with an POSIX interface
 537    or due to the implementation it is a cancellation point and
 538    therefore not marked with __THROW.  */
 539 extern int iruserok_af (const void *__raddr, int __suser,
 540                         const char *__remuser, const char *__locuser,
 541                         sa_family_t __af);
 542
 543 /* Try to allocate reserved port, returning a descriptor for a socket opened
 544    at this port or -1 if unsuccessful.  The search for an available port
 545    will start at ALPORT and continues with lower numbers.
 546
 547    This function is not part of POSIX and therefore no official
 548    cancellation point.  But due to similarity with an POSIX interface
 549    or due to the implementation it is a cancellation point and
 550    therefore not marked with __THROW.  */
 551 extern int rresvport (int *__alport);
 552
 553 /* This is the equivalent function where the protocol can be selected
 554    and which therefore can be used for IPv6.
 555
 556    This function is not part of POSIX and therefore no official
 557    cancellation point.  But due to similarity with an POSIX interface
 558    or due to the implementation it is a cancellation point and
 559    therefore not marked with __THROW.  */
 560 extern int rresvport_af (int *__alport, sa_family_t __af);
 561 #endif
 562
 563
 564 /* Extension from POSIX.1:2001.  */
 565 #ifdef __USE_XOPEN2K
 566 /* Structure to contain information about address of a service provider.  */
 567 struct addrinfo
 568 {
 569   int ai_flags;                 /* Input flags.  */
 570   int ai_family;                /* Protocol family for socket.  */
 571   int ai_socktype;              /* Socket type.  */
 572   int ai_protocol;              /* Protocol for socket.  */
 573   socklen_t ai_addrlen;         /* Length of socket address.  */
 574   struct sockaddr *ai_addr;     /* Socket address for socket.  */
 575   char *ai_canonname;           /* Canonical name for service location.  */
 576   struct addrinfo *ai_next;     /* Pointer to next in list.  */
 577 };
 578
 579 # ifdef __USE_GNU
 580 /* Structure used as control block for asynchronous lookup.  */
 581 struct gaicb
 582 {
 583   const char *ar_name;          /* Name to look up.  */
 584   const char *ar_service;       /* Service name.  */
 585   const struct addrinfo *ar_request; /* Additional request specification.  */
 586   struct addrinfo *ar_result;   /* Pointer to result.  */
 587   /* The following are internal elements.  */
 588   int __return;
 589   int __glibc_reserved[5];
 590 };
 591
 592 /* Lookup mode.  */
 593 #  define GAI_WAIT      0
 594 #  define GAI_NOWAIT    1
 595 # endif
 596
 597 /* Possible values for `ai_flags' field in `addrinfo' structure.  */
 598 # define AI_PASSIVE     0x0001  /* Socket address is intended for `bind'.  */
 599 # define AI_CANONNAME   0x0002  /* Request for canonical name.  */
 600 # define AI_NUMERICHOST 0x0004  /* Don't use name resolution.  */
 601 # define AI_V4MAPPED    0x0008  /* IPv4 mapped addresses are acceptable.  */
 602 # define AI_ALL         0x0010  /* Return IPv4 mapped and IPv6 addresses.  */
 603 # define AI_ADDRCONFIG  0x0020  /* Use configuration of this host to choose
 604                                    returned address type..  */
 605 # ifdef __USE_GNU
 606 #  define AI_IDN        0x0040  /* IDN encode input (assuming it is encoded
 607                                    in the current locale's character set)
 608                                    before looking it up. */
 609 #  define AI_CANONIDN   0x0080  /* Translate canonical name from IDN format. */
 610 #  define AI_IDN_ALLOW_UNASSIGNED 0x0100 /* Don't reject unassigned Unicode
 611                                             code points.  */
 612 #  define AI_IDN_USE_STD3_ASCII_RULES 0x0200 /* Validate strings according to
 613                                                 STD3 rules.  */
 614 # endif
 615 # define AI_NUMERICSERV 0x0400  /* Don't use name resolution.  */
 616
 617 /* Error values for `getaddrinfo' function.  */
 618 # define EAI_BADFLAGS     -1    /* Invalid value for `ai_flags' field.  */
 619 # define EAI_NONAME       -2    /* NAME or SERVICE is unknown.  */
 620 # define EAI_AGAIN        -3    /* Temporary failure in name resolution.  */
 621 # define EAI_FAIL         -4    /* Non-recoverable failure in name res.  */
 622 # define EAI_FAMILY       -6    /* `ai_family' not supported.  */
 623 # define EAI_SOCKTYPE     -7    /* `ai_socktype' not supported.  */
 624 # define EAI_SERVICE      -8    /* SERVICE not supported for `ai_socktype'.  */
 625 # define EAI_MEMORY       -10   /* Memory allocation failure.  */
 626 # define EAI_SYSTEM       -11   /* System error returned in `errno'.  */
 627 # define EAI_OVERFLOW     -12   /* Argument buffer overflow.  */
 628 # ifdef __USE_GNU
 629 #  define EAI_NODATA      -5    /* No address associated with NAME.  */
 630 #  define EAI_ADDRFAMILY  -9    /* Address family for NAME not supported.  */
 631 #  define EAI_INPROGRESS  -100  /* Processing request in progress.  */
 632 #  define EAI_CANCELED    -101  /* Request canceled.  */
 633 #  define EAI_NOTCANCELED -102  /* Request not canceled.  */
 634 #  define EAI_ALLDONE     -103  /* All requests done.  */
 635 #  define EAI_INTR        -104  /* Interrupted by a signal.  */
 636 #  define EAI_IDN_ENCODE  -105  /* IDN encoding failed.  */
 637 # endif
 638
 639 # ifdef __USE_MISC
 640 #  define NI_MAXHOST      1025
 641 #  define NI_MAXSERV      32
 642 # endif
 643
 644 # define NI_NUMERICHOST 1       /* Don't try to look up hostname.  */
 645 # define NI_NUMERICSERV 2       /* Don't convert port number to name.  */
 646 # define NI_NOFQDN      4       /* Only return nodename portion.  */
 647 # define NI_NAMEREQD    8       /* Don't return numeric addresses.  */
 648 # define NI_DGRAM       16      /* Look up UDP service rather than TCP.  */
 649 # ifdef __USE_GNU
 650 #  define NI_IDN        32      /* Convert name from IDN format.  */
 651 #  define NI_IDN_ALLOW_UNASSIGNED 64 /* Don't reject unassigned Unicode
 652                                         code points.  */
 653 #  define NI_IDN_USE_STD3_ASCII_RULES 128 /* Validate strings according to
 654                                              STD3 rules.  */
 655 # endif
 656
 657 /* Translate name of a service location and/or a service name to set of
 658    socket addresses.
 659
 660    This function is a possible cancellation point and therefore not
 661    marked with __THROW.  */
 662 extern int getaddrinfo (const char *__restrict __name,
 663                         const char *__restrict __service,
 664                         const struct addrinfo *__restrict __req,
 665                         struct addrinfo **__restrict __pai);
 666
 667 /* Free `addrinfo' structure AI including associated storage.  */
 668 extern void freeaddrinfo (struct addrinfo *__ai) __THROW;
 669
 670 /* Convert error return from getaddrinfo() to a string.  */
 671 extern const char *gai_strerror (int __ecode) __THROW;
 672
 673 /* Translate a socket address to a location and service name.
 674
 675    This function is a possible cancellation point and therefore not
 676    marked with __THROW.  */
 677 extern int getnameinfo (const struct sockaddr *__restrict __sa,
 678                         socklen_t __salen, char *__restrict __host,
 679                         socklen_t __hostlen, char *__restrict __serv,
 680                         socklen_t __servlen, int __flags);
 681 #endif  /* POSIX */
 682
 683 #ifdef __USE_GNU
 684 /* Enqueue ENT requests from the LIST.  If MODE is GAI_WAIT wait until all
 685    requests are handled.  If WAIT is GAI_NOWAIT return immediately after
 686    queueing the requests and signal completion according to SIG.
 687
 688    This function is not part of POSIX and therefore no official
 689    cancellation point.  But due to similarity with an POSIX interface
 690    or due to the implementation it is a cancellation point and
 691    therefore not marked with __THROW.  */
 692 extern int getaddrinfo_a (int __mode, struct gaicb *__list[__restrict_arr],
 693                           int __ent, struct sigevent *__restrict __sig);
 694
 695 /* Suspend execution of the thread until at least one of the ENT requests
 696    in LIST is handled.  If TIMEOUT is not a null pointer it specifies the
 697    longest time the function keeps waiting before returning with an error.
 698
 699    This function is not part of POSIX and therefore no official
 700    cancellation point.  But due to similarity with an POSIX interface
 701    or due to the implementation it is a cancellation point and
 702    therefore not marked with __THROW.  */
 703 extern int gai_suspend (const struct gaicb *const __list[], int __ent,
 704                         const struct timespec *__timeout);
 705
 706 /* Get the error status of the request REQ.  */
 707 extern int gai_error (struct gaicb *__req) __THROW;
 708
 709 /* Cancel the requests associated with GAICBP.  */
 710 extern int gai_cancel (struct gaicb *__gaicbp) __THROW;
 711 #endif  /* GNU */
 712
 713 __END_DECLS
 714
 715 #endif  /* netdb.h */