resolv/netdb.h

   1   /* Copyright (C) 1996-2002, 2003, 2004, 2009 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 /* 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 #if defined __USE_MISC || defined __USE_GNU
  73 # define NETDB_INTERNAL -1      /* See errno.  */
  74 # define NETDB_SUCCESS  0       /* No problem.  */
  75 # define NO_ADDRESS     NO_DATA /* No address, look for MX record.  */
  76 #endif
  77
  78 #ifdef __USE_XOPEN2K
  79 /* Highest reserved Internet port number.  */
  80 # define IPPORT_RESERVED        1024
  81 #endif
  82
  83 #ifdef __USE_GNU
  84 /* Scope delimiter for getaddrinfo(), getnameinfo().  */
  85 # define SCOPE_DELIMITER        '%'
  86 #endif
  87
  88 #if defined __USE_MISC || defined __USE_GNU
  89 /* Print error indicated by `h_errno' variable on standard error.  STR
  90    if non-null is printed before the error string.  */
  91 extern void herror (__const char *__str) __THROW;
  92
  93 /* Return string associated with error ERR_NUM.  */
  94 extern __const char *hstrerror (int __err_num) __THROW;
  95 #endif
  96
  97
  98 /* Description of data base entry for a single host.  */
  99 struct hostent
 100 {
 101   char *h_name;                 /* Official name of host.  */
 102   char **h_aliases;             /* Alias list.  */
 103   int h_addrtype;               /* Host address type.  */
 104   int h_length;                 /* Length of address.  */
 105   char **h_addr_list;           /* List of addresses from name server.  */
 106 #if defined __USE_MISC || defined __USE_GNU
 107 # define        h_addr  h_addr_list[0] /* Address, for backward compatibility.*/
 108 #endif
 109 };
 110
 111 /* Open host data base files and mark them as staying open even after
 112    a later search if STAY_OPEN is non-zero.
 113
 114    This function is a possible cancellation point and therefore not
 115    marked with __THROW.  */
 116 extern void sethostent (int __stay_open);
 117
 118 /* Close host data base files and clear `stay open' flag.
 119
 120    This function is a possible cancellation point and therefore not
 121    marked with __THROW.  */
 122 extern void endhostent (void);
 123
 124 /* Get next entry from host data base file.  Open data base if
 125    necessary.
 126
 127    This function is a possible cancellation point and therefore not
 128    marked with __THROW.  */
 129 extern struct hostent *gethostent (void);
 130
 131 /* Return entry from host data base which address match ADDR with
 132    length LEN and type TYPE.
 133
 134    This function is a possible cancellation point and therefore not
 135    marked with __THROW.  */
 136 extern struct hostent *gethostbyaddr (__const void *__addr, __socklen_t __len,
 137                                       int __type);
 138
 139 /* Return entry from host data base for host with NAME.
 140
 141    This function is a possible cancellation point and therefore not
 142    marked with __THROW.  */
 143 extern struct hostent *gethostbyname (__const char *__name);
 144
 145 #ifdef __USE_MISC
 146 /* Return entry from host data base for host with NAME.  AF must be
 147    set to the address type which is `AF_INET' for IPv4 or `AF_INET6'
 148    for IPv6.
 149
 150    This function is not part of POSIX and therefore no official
 151    cancellation point.  But due to similarity with an POSIX interface
 152    or due to the implementation it is a cancellation point and
 153    therefore not marked with __THROW.  */
 154 extern struct hostent *gethostbyname2 (__const char *__name, int __af);
 155
 156 /* Reentrant versions of the functions above.  The additional
 157    arguments specify a buffer of BUFLEN starting at BUF.  The last
 158    argument is a pointer to a variable which gets the value which
 159    would be stored in the global variable `herrno' by the
 160    non-reentrant functions.
 161
 162    These functions are not part of POSIX and therefore no official
 163    cancellation point.  But due to similarity with an POSIX interface
 164    or due to the implementation they are cancellation points and
 165    therefore not marked with __THROW.  */
 166 extern int gethostent_r (struct hostent *__restrict __result_buf,
 167                          char *__restrict __buf, size_t __buflen,
 168                          struct hostent **__restrict __result,
 169                          int *__restrict __h_errnop);
 170
 171 extern int gethostbyaddr_r (__const void *__restrict __addr, __socklen_t __len,
 172                             int __type,
 173                             struct hostent *__restrict __result_buf,
 174                             char *__restrict __buf, size_t __buflen,
 175                             struct hostent **__restrict __result,
 176                             int *__restrict __h_errnop);
 177
 178 extern int gethostbyname_r (__const char *__restrict __name,
 179                             struct hostent *__restrict __result_buf,
 180                             char *__restrict __buf, size_t __buflen,
 181                             struct hostent **__restrict __result,
 182                             int *__restrict __h_errnop);
 183
 184 extern int gethostbyname2_r (__const char *__restrict __name, int __af,
 185                              struct hostent *__restrict __result_buf,
 186                              char *__restrict __buf, size_t __buflen,
 187                              struct hostent **__restrict __result,
 188                              int *__restrict __h_errnop);
 189 #endif  /* misc */
 190
 191
 192 /* Open network data base files and mark them as staying open even
 193    after a later search if STAY_OPEN is non-zero.
 194
 195    This function is a possible cancellation point and therefore not
 196    marked with __THROW.  */
 197 extern void setnetent (int __stay_open);
 198
 199 /* Close network data base files and clear `stay open' flag.
 200
 201    This function is a possible cancellation point and therefore not
 202    marked with __THROW.  */
 203 extern void endnetent (void);
 204
 205 /* Get next entry from network data base file.  Open data base if
 206    necessary.
 207
 208    This function is a possible cancellation point and therefore not
 209    marked with __THROW.  */
 210 extern struct netent *getnetent (void);
 211
 212 /* Return entry from network data base which address match NET and
 213    type TYPE.
 214
 215    This function is a possible cancellation point and therefore not
 216    marked with __THROW.  */
 217 extern struct netent *getnetbyaddr (uint32_t __net, int __type);
 218
 219 /* Return entry from network data base for network with NAME.
 220
 221    This function is a possible cancellation point and therefore not
 222    marked with __THROW.  */
 223 extern struct netent *getnetbyname (__const char *__name);
 224
 225 #ifdef  __USE_MISC
 226 /* Reentrant versions of the functions above.  The additional
 227    arguments specify a buffer of BUFLEN starting at BUF.  The last
 228    argument is a pointer to a variable which gets the value which
 229    would be stored in the global variable `herrno' by the
 230    non-reentrant functions.
 231
 232    These functions are not part of POSIX and therefore no official
 233    cancellation point.  But due to similarity with an POSIX interface
 234    or due to the implementation they are cancellation points and
 235    therefore not marked with __THROW.  */
 236 extern int getnetent_r (struct netent *__restrict __result_buf,
 237                         char *__restrict __buf, size_t __buflen,
 238                         struct netent **__restrict __result,
 239                         int *__restrict __h_errnop);
 240
 241 extern int getnetbyaddr_r (uint32_t __net, int __type,
 242                            struct netent *__restrict __result_buf,
 243                            char *__restrict __buf, size_t __buflen,
 244                            struct netent **__restrict __result,
 245                            int *__restrict __h_errnop);
 246
 247 extern int getnetbyname_r (__const char *__restrict __name,
 248                            struct netent *__restrict __result_buf,
 249                            char *__restrict __buf, size_t __buflen,
 250                            struct netent **__restrict __result,
 251                            int *__restrict __h_errnop);
 252 #endif  /* misc */
 253
 254
 255 /* Description of data base entry for a single service.  */
 256 struct servent
 257 {
 258   char *s_name;                 /* Official service name.  */
 259   char **s_aliases;             /* Alias list.  */
 260   int s_port;                   /* Port number.  */
 261   char *s_proto;                /* Protocol to use.  */
 262 };
 263
 264 /* Open service data base files and mark them as staying open even
 265    after a later search if STAY_OPEN is non-zero.
 266
 267    This function is a possible cancellation point and therefore not
 268    marked with __THROW.  */
 269 extern void setservent (int __stay_open);
 270
 271 /* Close service data base files and clear `stay open' flag.
 272
 273    This function is a possible cancellation point and therefore not
 274    marked with __THROW.  */
 275 extern void endservent (void);
 276
 277 /* Get next entry from service data base file.  Open data base if
 278    necessary.
 279
 280    This function is a possible cancellation point and therefore not
 281    marked with __THROW.  */
 282 extern struct servent *getservent (void);
 283
 284 /* Return entry from network data base for network with NAME and
 285    protocol PROTO.
 286
 287    This function is a possible cancellation point and therefore not
 288    marked with __THROW.  */
 289 extern struct servent *getservbyname (__const char *__name,
 290                                       __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_BSD
 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 /* Try to allocate reserved port, returning a descriptor for a socket opened
 520    at this port or -1 if unsuccessful.  The search for an available port
 521    will start at ALPORT and continues with lower numbers.
 522
 523    This function is not part of POSIX and therefore no official
 524    cancellation point.  But due to similarity with an POSIX interface
 525    or due to the implementation it is a cancellation point and
 526    therefore not marked with __THROW.  */
 527 extern int rresvport (int *__alport);
 528
 529 /* This is the equivalent function where the protocol can be selected
 530    and which therefore can be used for IPv6.
 531
 532    This function is not part of POSIX and therefore no official
 533    cancellation point.  But due to similarity with an POSIX interface
 534    or due to the implementation it is a cancellation point and
 535    therefore not marked with __THROW.  */
 536 extern int rresvport_af (int *__alport, sa_family_t __af);
 537 #endif
 538
 539
 540 /* Extension from POSIX.1g.  */
 541 #ifdef  __USE_POSIX
 542 /* Structure to contain information about address of a service provider.  */
 543 struct addrinfo
 544 {
 545   int ai_flags;                 /* Input flags.  */
 546   int ai_family;                /* Protocol family for socket.  */
 547   int ai_socktype;              /* Socket type.  */
 548   int ai_protocol;              /* Protocol for socket.  */
 549   socklen_t ai_addrlen;         /* Length of socket address.  */
 550   struct sockaddr *ai_addr;     /* Socket address for socket.  */
 551   char *ai_canonname;           /* Canonical name for service location.  */
 552   struct addrinfo *ai_next;     /* Pointer to next in list.  */
 553 };
 554
 555 # ifdef __USE_GNU
 556 /* Structure used as control block for asynchronous lookup.  */
 557 struct gaicb
 558 {
 559   const char *ar_name;          /* Name to look up.  */
 560   const char *ar_service;       /* Service name.  */
 561   const struct addrinfo *ar_request; /* Additional request specification.  */
 562   struct addrinfo *ar_result;   /* Pointer to result.  */
 563   /* The following are internal elements.  */
 564   int __return;
 565   int __unused[5];
 566 };
 567
 568 /* Lookup mode.  */
 569 #  define GAI_WAIT      0
 570 #  define GAI_NOWAIT    1
 571 # endif
 572
 573 /* Possible values for `ai_flags' field in `addrinfo' structure.  */
 574 # define AI_PASSIVE     0x0001  /* Socket address is intended for `bind'.  */
 575 # define AI_CANONNAME   0x0002  /* Request for canonical name.  */
 576 # define AI_NUMERICHOST 0x0004  /* Don't use name resolution.  */
 577 # define AI_V4MAPPED    0x0008  /* IPv4 mapped addresses are acceptable.  */
 578 # define AI_ALL         0x0010  /* Return IPv4 mapped and IPv6 addresses.  */
 579 # define AI_ADDRCONFIG  0x0020  /* Use configuration of this host to choose
 580                                    returned address type..  */
 581 # ifdef __USE_GNU
 582 #  define AI_IDN        0x0040  /* IDN encode input (assuming it is encoded
 583                                    in the current locale's character set)
 584                                    before looking it up. */
 585 #  define AI_CANONIDN   0x0080  /* Translate canonical name from IDN format. */
 586 #  define AI_IDN_ALLOW_UNASSIGNED 0x0100 /* Don't reject unassigned Unicode
 587                                             code points.  */
 588 #  define AI_IDN_USE_STD3_ASCII_RULES 0x0200 /* Validate strings according to
 589                                                 STD3 rules.  */
 590 # endif
 591 # define AI_NUMERICSERV 0x0400  /* Don't use name resolution.  */
 592
 593 /* Error values for `getaddrinfo' function.  */
 594 # define EAI_BADFLAGS     -1    /* Invalid value for `ai_flags' field.  */
 595 # define EAI_NONAME       -2    /* NAME or SERVICE is unknown.  */
 596 # define EAI_AGAIN        -3    /* Temporary failure in name resolution.  */
 597 # define EAI_FAIL         -4    /* Non-recoverable failure in name res.  */
 598 # define EAI_FAMILY       -6    /* `ai_family' not supported.  */
 599 # define EAI_SOCKTYPE     -7    /* `ai_socktype' not supported.  */
 600 # define EAI_SERVICE      -8    /* SERVICE not supported for `ai_socktype'.  */
 601 # define EAI_MEMORY       -10   /* Memory allocation failure.  */
 602 # define EAI_SYSTEM       -11   /* System error returned in `errno'.  */
 603 # define EAI_OVERFLOW     -12   /* Argument buffer overflow.  */
 604 # ifdef __USE_GNU
 605 #  define EAI_NODATA      -5    /* No address associated with NAME.  */
 606 #  define EAI_ADDRFAMILY  -9    /* Address family for NAME not supported.  */
 607 #  define EAI_INPROGRESS  -100  /* Processing request in progress.  */
 608 #  define EAI_CANCELED    -101  /* Request canceled.  */
 609 #  define EAI_NOTCANCELED -102  /* Request not canceled.  */
 610 #  define EAI_ALLDONE     -103  /* All requests done.  */
 611 #  define EAI_INTR        -104  /* Interrupted by a signal.  */
 612 #  define EAI_IDN_ENCODE  -105  /* IDN encoding failed.  */
 613 # endif
 614
 615 # ifdef __USE_MISC
 616 #  define NI_MAXHOST      1025
 617 #  define NI_MAXSERV      32
 618 # endif
 619
 620 # define NI_NUMERICHOST 1       /* Don't try to look up hostname.  */
 621 # define NI_NUMERICSERV 2       /* Don't convert port number to name.  */
 622 # define NI_NOFQDN      4       /* Only return nodename portion.  */
 623 # define NI_NAMEREQD    8       /* Don't return numeric addresses.  */
 624 # define NI_DGRAM       16      /* Look up UDP service rather than TCP.  */
 625 # ifdef __USE_GNU
 626 #  define NI_IDN        32      /* Convert name from IDN format.  */
 627 #  define NI_IDN_ALLOW_UNASSIGNED 64 /* Don't reject unassigned Unicode
 628                                         code points.  */
 629 #  define NI_IDN_USE_STD3_ASCII_RULES 128 /* Validate strings according to
 630                                              STD3 rules.  */
 631 # endif
 632
 633 /* Translate name of a service location and/or a service name to set of
 634    socket addresses.
 635
 636    This function is a possible cancellation point and therefore not
 637    marked with __THROW.  */
 638 extern int getaddrinfo (__const char *__restrict __name,
 639                         __const char *__restrict __service,
 640                         __const struct addrinfo *__restrict __req,
 641                         struct addrinfo **__restrict __pai);
 642
 643 /* Free `addrinfo' structure AI including associated storage.  */
 644 extern void freeaddrinfo (struct addrinfo *__ai) __THROW;
 645
 646 /* Convert error return from getaddrinfo() to a string.  */
 647 extern __const char *gai_strerror (int __ecode) __THROW;
 648
 649 /* Translate a socket address to a location and service name.
 650
 651    This function is a possible cancellation point and therefore not
 652    marked with __THROW.  */
 653 extern int getnameinfo (__const struct sockaddr *__restrict __sa,
 654                         socklen_t __salen, char *__restrict __host,
 655                         socklen_t __hostlen, char *__restrict __serv,
 656                         socklen_t __servlen, unsigned int __flags);
 657 #endif  /* POSIX */
 658
 659 #ifdef __USE_GNU
 660 /* Enqueue ENT requests from the LIST.  If MODE is GAI_WAIT wait until all
 661    requests are handled.  If WAIT is GAI_NOWAIT return immediately after
 662    queueing the requests and signal completion according to SIG.
 663
 664    This function is not part of POSIX and therefore no official
 665    cancellation point.  But due to similarity with an POSIX interface
 666    or due to the implementation it is a cancellation point and
 667    therefore not marked with __THROW.  */
 668 extern int getaddrinfo_a (int __mode, struct gaicb *__list[__restrict_arr],
 669                           int __ent, struct sigevent *__restrict __sig);
 670
 671 /* Suspend execution of the thread until at least one of the ENT requests
 672    in LIST is handled.  If TIMEOUT is not a null pointer it specifies the
 673    longest time the function keeps waiting before returning with an error.
 674
 675    This function is not part of POSIX and therefore no official
 676    cancellation point.  But due to similarity with an POSIX interface
 677    or due to the implementation it is a cancellation point and
 678    therefore not marked with __THROW.  */
 679 extern int gai_suspend (__const struct gaicb *__const __list[], int __ent,
 680                         __const struct timespec *__timeout);
 681
 682 /* Get the error status of the request REQ.  */
 683 extern int gai_error (struct gaicb *__req) __THROW;
 684
 685 /* Cancel the requests associated with GAICBP.  */
 686 extern int gai_cancel (struct gaicb *__gaicbp) __THROW;
 687 #endif  /* GNU */
 688
 689 __END_DECLS
 690
 691 #endif  /* netdb.h */