include/netdb.h

   1 /* Copyright (C) 1996-2002, 2003, 2004 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 #if defined __USE_MISC && defined __UCLIBC_HAS_RPC__
  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 libc_hidden_proto(__h_errno_location)
  63
  64 /* Macros for accessing h_errno from inside libc.  */
  65 #ifdef _LIBC
  66 # ifdef __UCLIBC_HAS_THREADS__
  67 #  if defined __UCLIBC_HAS_TLS__ \
  68              && (!defined NOT_IN_libc || defined IS_IN_libpthread)
  69 #   undef h_errno
  70 #   ifndef NOT_IN_libc
  71 #    define h_errno __libc_h_errno
  72 #   else
  73 #    define h_errno h_errno     /* For #ifndef h_errno tests.  */
  74 #   endif
  75 extern __thread int h_errno attribute_tls_model_ie;
  76 #   define __set_h_errno(x) (h_errno = (x))
  77 #  else
  78 static inline int __set_h_errno (int __err)
  79 {
  80        return *__h_errno_location () = __err;
  81 }
  82 #  endif /* __UCLIBC_HAS_TLS__ */
  83 # else
  84 #  undef h_errno
  85 #  define __set_h_errno(x) (h_errno = (x))
  86 extern int h_errno;
  87 # endif /* __UCLIBC_HAS_THREADS__ */
  88 #endif /* _LIBC */
  89
  90 /* Possible values left in `h_errno'.  */
  91 #define NETDB_INTERNAL  -1      /* See errno.  */
  92 #define NETDB_SUCCESS   0       /* No problem.  */
  93 #define HOST_NOT_FOUND  1       /* Authoritative Answer Host not found.  */
  94 #define TRY_AGAIN       2       /* Non-Authoritative Host not found,
  95                                    or SERVERFAIL.  */
  96 #define NO_RECOVERY     3       /* Non recoverable errors, FORMERR, REFUSED,
  97                                    NOTIMP.  */
  98 #define NO_DATA         4       /* Valid name, no data record of requested
  99                                    type.  */
 100 #define NO_ADDRESS      NO_DATA /* No address, look for MX record.  */
 101
 102 #ifdef __USE_XOPEN2K
 103 /* Highest reserved Internet port number.  */
 104 # define IPPORT_RESERVED        1024
 105 #endif
 106
 107 #ifdef __USE_GNU
 108 /* Scope delimiter for getaddrinfo(), getnameinfo().  */
 109 # define SCOPE_DELIMITER        '%'
 110 #endif
 111
 112 /* Print error indicated by `h_errno' variable on standard error.  STR
 113    if non-null is printed before the error string.  */
 114 extern void herror (__const char *__str) __THROW;
 115 libc_hidden_proto(herror)
 116
 117 /* Return string associated with error ERR_NUM.  */
 118 extern __const char *hstrerror (int __err_num) __THROW;
 119
 120
 121 /* Description of data base entry for a single host.  */
 122 struct hostent
 123 {
 124   char *h_name;                 /* Official name of host.  */
 125   char **h_aliases;             /* Alias list.  */
 126   int h_addrtype;               /* Host address type.  */
 127   int h_length;                 /* Length of address.  */
 128   char **h_addr_list;           /* List of addresses from name server.  */
 129 #define h_addr  h_addr_list[0]  /* Address, for backward compatibility.  */
 130 };
 131
 132 /* Open host data base files and mark them as staying open even after
 133    a later search if STAY_OPEN is non-zero.
 134
 135    This function is a possible cancellation point and therefore not
 136    marked with __THROW.  */
 137 extern void sethostent (int __stay_open);
 138
 139 /* Close host data base files and clear `stay open' flag.
 140
 141    This function is a possible cancellation point and therefore not
 142    marked with __THROW.  */
 143 extern void endhostent (void);
 144
 145 /* Get next entry from host data base file.  Open data base if
 146    necessary.
 147
 148    This function is a possible cancellation point and therefore not
 149    marked with __THROW.  */
 150 extern struct hostent *gethostent (void);
 151
 152 /* Return entry from host data base which address match ADDR with
 153    length LEN and type TYPE.
 154
 155    This function is a possible cancellation point and therefore not
 156    marked with __THROW.  */
 157 extern struct hostent *gethostbyaddr (__const void *__addr, __socklen_t __len,
 158                                       int __type);
 159 libc_hidden_proto(gethostbyaddr)
 160
 161 /* Return entry from host data base for host with NAME.
 162
 163    This function is a possible cancellation point and therefore not
 164    marked with __THROW.  */
 165 extern struct hostent *gethostbyname (__const char *__name);
 166 libc_hidden_proto(gethostbyname)
 167
 168 #ifdef __USE_MISC
 169 /* Return entry from host data base for host with NAME.  AF must be
 170    set to the address type which is `AF_INET' for IPv4 or `AF_INET6'
 171    for IPv6.
 172
 173    This function is not part of POSIX and therefore no official
 174    cancellation point.  But due to similarity with an POSIX interface
 175    or due to the implementation it is a cancellation point and
 176    therefore not marked with __THROW.  */
 177 extern struct hostent *gethostbyname2 (__const char *__name, int __af);
 178 libc_hidden_proto(gethostbyname2)
 179
 180 /* Reentrant versions of the functions above.  The additional
 181    arguments specify a buffer of BUFLEN starting at BUF.  The last
 182    argument is a pointer to a variable which gets the value which
 183    would be stored in the global variable `herrno' by the
 184    non-reentrant functions.
 185
 186    These functions are not part of POSIX and therefore no official
 187    cancellation point.  But due to similarity with an POSIX interface
 188    or due to the implementation they are cancellation points and
 189    therefore not marked with __THROW.  */
 190 extern int gethostent_r (struct hostent *__restrict __result_buf,
 191                          char *__restrict __buf, size_t __buflen,
 192                          struct hostent **__restrict __result,
 193                          int *__restrict __h_errnop);
 194 libc_hidden_proto(gethostent_r)
 195
 196 extern int gethostbyaddr_r (__const void *__restrict __addr, __socklen_t __len,
 197                             int __type,
 198                             struct hostent *__restrict __result_buf,
 199                             char *__restrict __buf, size_t __buflen,
 200                             struct hostent **__restrict __result,
 201                             int *__restrict __h_errnop);
 202 libc_hidden_proto(gethostbyaddr_r)
 203
 204 extern int gethostbyname_r (__const char *__restrict __name,
 205                             struct hostent *__restrict __result_buf,
 206                             char *__restrict __buf, size_t __buflen,
 207                             struct hostent **__restrict __result,
 208                             int *__restrict __h_errnop);
 209 libc_hidden_proto(gethostbyname_r)
 210
 211 extern int gethostbyname2_r (__const char *__restrict __name, int __af,
 212                              struct hostent *__restrict __result_buf,
 213                              char *__restrict __buf, size_t __buflen,
 214                              struct hostent **__restrict __result,
 215                              int *__restrict __h_errnop);
 216 libc_hidden_proto(gethostbyname2_r)
 217 #endif  /* misc */
 218
 219
 220 /* Open network data base files and mark them as staying open even
 221    after a later search if STAY_OPEN is non-zero.
 222
 223    This function is a possible cancellation point and therefore not
 224    marked with __THROW.  */
 225 extern void setnetent (int __stay_open);
 226 libc_hidden_proto(setnetent)
 227
 228 /* Close network data base files and clear `stay open' flag.
 229
 230    This function is a possible cancellation point and therefore not
 231    marked with __THROW.  */
 232 extern void endnetent (void);
 233 libc_hidden_proto(endnetent)
 234
 235 /* Get next entry from network data base file.  Open data base if
 236    necessary.
 237
 238    This function is a possible cancellation point and therefore not
 239    marked with __THROW.  */
 240 extern struct netent *getnetent (void);
 241
 242 /* Return entry from network data base which address match NET and
 243    type TYPE.
 244
 245    This function is a possible cancellation point and therefore not
 246    marked with __THROW.  */
 247 extern struct netent *getnetbyaddr (uint32_t __net, int __type);
 248
 249 /* Return entry from network data base for network with NAME.
 250
 251    This function is a possible cancellation point and therefore not
 252    marked with __THROW.  */
 253 extern struct netent *getnetbyname (__const char *__name);
 254
 255 #ifdef  __USE_MISC
 256 /* Reentrant versions of the functions above.  The additional
 257    arguments specify a buffer of BUFLEN starting at BUF.  The last
 258    argument is a pointer to a variable which gets the value which
 259    would be stored in the global variable `herrno' by the
 260    non-reentrant functions.
 261
 262    These functions are not part of POSIX and therefore no official
 263    cancellation point.  But due to similarity with an POSIX interface
 264    or due to the implementation they are cancellation points and
 265    therefore not marked with __THROW.  */
 266 extern int getnetent_r (struct netent *__restrict __result_buf,
 267                         char *__restrict __buf, size_t __buflen,
 268                         struct netent **__restrict __result,
 269                         int *__restrict __h_errnop);
 270 libc_hidden_proto(getnetent_r)
 271 extern int getnetbyaddr_r (uint32_t __net, int __type,
 272                            struct netent *__restrict __result_buf,
 273                            char *__restrict __buf, size_t __buflen,
 274                            struct netent **__restrict __result,
 275                            int *__restrict __h_errnop);
 276 libc_hidden_proto(getnetbyaddr_r)
 277 extern int getnetbyname_r (__const char *__restrict __name,
 278                            struct netent *__restrict __result_buf,
 279                            char *__restrict __buf, size_t __buflen,
 280                            struct netent **__restrict __result,
 281                            int *__restrict __h_errnop);
 282 libc_hidden_proto(getnetbyname_r)
 283 #endif  /* __USE_MISC */
 284
 285
 286 /* Description of data base entry for a single service.  */
 287 struct servent
 288 {
 289   char *s_name;                 /* Official service name.  */
 290   char **s_aliases;             /* Alias list.  */
 291   int s_port;                   /* Port number.  */
 292   char *s_proto;                /* Protocol to use.  */
 293 };
 294
 295 /* Open service data base files and mark them as staying open even
 296    after a later search if STAY_OPEN is non-zero.
 297
 298    This function is a possible cancellation point and therefore not
 299    marked with __THROW.  */
 300 extern void setservent (int __stay_open);
 301 libc_hidden_proto(setservent)
 302
 303 /* Close service data base files and clear `stay open' flag.
 304
 305    This function is a possible cancellation point and therefore not
 306    marked with __THROW.  */
 307 extern void endservent (void);
 308 libc_hidden_proto(endservent)
 309
 310 /* Get next entry from service data base file.  Open data base if
 311    necessary.
 312
 313    This function is a possible cancellation point and therefore not
 314    marked with __THROW.  */
 315 extern struct servent *getservent (void);
 316
 317 /* Return entry from network data base for network with NAME and
 318    protocol PROTO.
 319
 320    This function is a possible cancellation point and therefore not
 321    marked with __THROW.  */
 322 extern struct servent *getservbyname (__const char *__name,
 323                                       __const char *__proto);
 324
 325 /* Return entry from service data base which matches port PORT and
 326    protocol PROTO.
 327
 328    This function is a possible cancellation point and therefore not
 329    marked with __THROW.  */
 330 extern struct servent *getservbyport (int __port, __const char *__proto);
 331 libc_hidden_proto(getservbyport)
 332
 333
 334 #ifdef  __USE_MISC
 335 /* Reentrant versions of the functions above.  The additional
 336    arguments specify a buffer of BUFLEN starting at BUF.
 337
 338    These functions are not part of POSIX and therefore no official
 339    cancellation point.  But due to similarity with an POSIX interface
 340    or due to the implementation they are cancellation points and
 341    therefore not marked with __THROW.  */
 342 extern int getservent_r (struct servent *__restrict __result_buf,
 343                          char *__restrict __buf, size_t __buflen,
 344                          struct servent **__restrict __result);
 345 libc_hidden_proto(getservent_r)
 346
 347 extern int getservbyname_r (__const char *__restrict __name,
 348                             __const char *__restrict __proto,
 349                             struct servent *__restrict __result_buf,
 350                             char *__restrict __buf, size_t __buflen,
 351                             struct servent **__restrict __result);
 352 libc_hidden_proto(getservbyname_r)
 353
 354 extern int getservbyport_r (int __port, __const char *__restrict __proto,
 355                             struct servent *__restrict __result_buf,
 356                             char *__restrict __buf, size_t __buflen,
 357                             struct servent **__restrict __result);
 358 libc_hidden_proto(getservbyport_r)
 359 #endif  /* misc */
 360
 361
 362 /* Description of data base entry for a single service.  */
 363 struct protoent
 364 {
 365   char *p_name;                 /* Official protocol name.  */
 366   char **p_aliases;             /* Alias list.  */
 367   int p_proto;                  /* Protocol number.  */
 368 };
 369
 370 /* Open protocol data base files and mark them as staying open even
 371    after a later search if STAY_OPEN is non-zero.
 372
 373    This function is a possible cancellation point and therefore not
 374    marked with __THROW.  */
 375 extern void setprotoent (int __stay_open);
 376 libc_hidden_proto(setprotoent)
 377
 378 /* Close protocol data base files and clear `stay open' flag.
 379
 380    This function is a possible cancellation point and therefore not
 381    marked with __THROW.  */
 382 extern void endprotoent (void);
 383 libc_hidden_proto(endprotoent)
 384
 385 /* Get next entry from protocol data base file.  Open data base if
 386    necessary.
 387
 388    This function is a possible cancellation point and therefore not
 389    marked with __THROW.  */
 390 extern struct protoent *getprotoent (void);
 391
 392 /* Return entry from protocol data base for network with NAME.
 393
 394    This function is a possible cancellation point and therefore not
 395    marked with __THROW.  */
 396 extern struct protoent *getprotobyname (__const char *__name);
 397
 398 /* Return entry from protocol data base which number is PROTO.
 399
 400    This function is a possible cancellation point and therefore not
 401    marked with __THROW.  */
 402 extern struct protoent *getprotobynumber (int __proto);
 403
 404
 405 #ifdef  __USE_MISC
 406 /* Reentrant versions of the functions above.  The additional
 407    arguments specify a buffer of BUFLEN starting at BUF.
 408
 409    These functions are not part of POSIX and therefore no official
 410    cancellation point.  But due to similarity with an POSIX interface
 411    or due to the implementation they are cancellation points and
 412    therefore not marked with __THROW.  */
 413 extern int getprotoent_r (struct protoent *__restrict __result_buf,
 414                           char *__restrict __buf, size_t __buflen,
 415                           struct protoent **__restrict __result);
 416 libc_hidden_proto(getprotoent_r)
 417
 418 extern int getprotobyname_r (__const char *__restrict __name,
 419                              struct protoent *__restrict __result_buf,
 420                              char *__restrict __buf, size_t __buflen,
 421                              struct protoent **__restrict __result);
 422 libc_hidden_proto(getprotobyname_r)
 423
 424 extern int getprotobynumber_r (int __proto,
 425                                struct protoent *__restrict __result_buf,
 426                                char *__restrict __buf, size_t __buflen,
 427                                struct protoent **__restrict __result);
 428 libc_hidden_proto(getprotobynumber_r)
 429
 430
 431 #ifdef __UCLIBC_HAS_NETGROUP__
 432 /* Establish network group NETGROUP for enumeration.
 433
 434    This function is not part of POSIX and therefore no official
 435    cancellation point.  But due to similarity with an POSIX interface
 436    or due to the implementation it is a cancellation point and
 437    therefore not marked with __THROW.  */
 438 extern int setnetgrent (__const char *__netgroup);
 439
 440 /* Free all space allocated by previous `setnetgrent' call.
 441
 442    This function is not part of POSIX and therefore no official
 443    cancellation point.  But due to similarity with an POSIX interface
 444    or due to the implementation it is a cancellation point and
 445    therefore not marked with __THROW.  */
 446 extern void endnetgrent (void);
 447
 448 /* Get next member of netgroup established by last `setnetgrent' call
 449    and return pointers to elements in HOSTP, USERP, and DOMAINP.
 450
 451    This function is not part of POSIX and therefore no official
 452    cancellation point.  But due to similarity with an POSIX interface
 453    or due to the implementation it is a cancellation point and
 454    therefore not marked with __THROW.  */
 455 extern int getnetgrent (char **__restrict __hostp,
 456                         char **__restrict __userp,
 457                         char **__restrict __domainp);
 458
 459
 460 /* Test whether NETGROUP contains the triple (HOST,USER,DOMAIN).
 461
 462    This function is not part of POSIX and therefore no official
 463    cancellation point.  But due to similarity with an POSIX interface
 464    or due to the implementation it is a cancellation point and
 465    therefore not marked with __THROW.  */
 466 extern int innetgr (__const char *__netgroup, __const char *__host,
 467                     __const char *__user, __const char *domain);
 468
 469 /* Reentrant version of `getnetgrent' where result is placed in BUFFER.
 470
 471    This function is not part of POSIX and therefore no official
 472    cancellation point.  But due to similarity with an POSIX interface
 473    or due to the implementation it is a cancellation point and
 474    therefore not marked with __THROW.  */
 475 extern int getnetgrent_r (char **__restrict __hostp,
 476                           char **__restrict __userp,
 477                           char **__restrict __domainp,
 478                           char *__restrict __buffer, size_t __buflen);
 479 #endif  /* UCLIBC_HAS_NETGROUP */
 480 #endif  /* misc */
 481
 482
 483 /* ruserpass - remote password check.
 484    This function also exists in glibc but is undocumented */
 485 extern int ruserpass(const char *host, const char **aname, const char **apass);
 486 libc_hidden_proto(ruserpass)
 487
 488
 489 #ifdef __USE_BSD
 490 /* Call `rshd' at port RPORT on remote machine *AHOST to execute CMD.
 491    The local user is LOCUSER, on the remote machine the command is
 492    executed as REMUSER.  In *FD2P the descriptor to the socket for the
 493    connection is returned.  The caller must have the right to use a
 494    reserved port.  When the function returns *AHOST contains the
 495    official host name.
 496
 497    This function is not part of POSIX and therefore no official
 498    cancellation point.  But due to similarity with an POSIX interface
 499    or due to the implementation it is a cancellation point and
 500    therefore not marked with __THROW.  */
 501 extern int rcmd (char **__restrict __ahost, unsigned short int __rport,
 502                  __const char *__restrict __locuser,
 503                  __const char *__restrict __remuser,
 504                  __const char *__restrict __cmd, int *__restrict __fd2p);
 505
 506 #if 0
 507 /* FIXME */
 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 rcmd_af (char **__restrict __ahost, unsigned short int __rport,
 516                     __const char *__restrict __locuser,
 517                     __const char *__restrict __remuser,
 518                     __const char *__restrict __cmd, int *__restrict __fd2p,
 519                     sa_family_t __af);
 520 #endif
 521
 522 /* Call `rexecd' at port RPORT on remote machine *AHOST to execute
 523    CMD.  The process runs at the remote machine using the ID of user
 524    NAME whose cleartext password is PASSWD.  In *FD2P the descriptor
 525    to the socket for the connection is returned.  When the function
 526    returns *AHOST contains the official host name.
 527
 528    This function is not part of POSIX and therefore no official
 529    cancellation point.  But due to similarity with an POSIX interface
 530    or due to the implementation it is a cancellation point and
 531    therefore not marked with __THROW.  */
 532 extern int rexec (char **__restrict __ahost, int __rport,
 533                   __const char *__restrict __name,
 534                   __const char *__restrict __pass,
 535                   __const char *__restrict __cmd, int *__restrict __fd2p);
 536
 537 /* This is the equivalent function where the protocol can be selected
 538    and which therefore can be used for IPv6.
 539
 540    This function is not part of POSIX and therefore no official
 541    cancellation point.  But due to similarity with an POSIX interface
 542    or due to the implementation it is a cancellation point and
 543    therefore not marked with __THROW.  */
 544 extern int rexec_af (char **__restrict __ahost, int __rport,
 545                      __const char *__restrict __name,
 546                      __const char *__restrict __pass,
 547                      __const char *__restrict __cmd, int *__restrict __fd2p,
 548                      sa_family_t __af);
 549 libc_hidden_proto(rexec_af)
 550
 551 /* Check whether user REMUSER on system RHOST is allowed to login as LOCUSER.
 552    If SUSER is not zero the user tries to become superuser.  Return 0 if
 553    it is possible.
 554
 555    This function is not part of POSIX and therefore no official
 556    cancellation point.  But due to similarity with an POSIX interface
 557    or due to the implementation it is a cancellation point and
 558    therefore not marked with __THROW.  */
 559 extern int ruserok (__const char *__rhost, int __suser,
 560                     __const char *__remuser, __const char *__locuser);
 561
 562 #if 0
 563 /* FIXME */
 564 /* This is the equivalent function where the protocol can be selected
 565    and which therefore can be used for IPv6.
 566
 567    This function is not part of POSIX and therefore no official
 568    cancellation point.  But due to similarity with an POSIX interface
 569    or due to the implementation it is a cancellation point and
 570    therefore not marked with __THROW.  */
 571 extern int ruserok_af (__const char *__rhost, int __suser,
 572                        __const char *__remuser, __const char *__locuser,
 573                        sa_family_t __af);
 574 #endif
 575
 576 /* Try to allocate reserved port, returning a descriptor for a socket opened
 577    at this port or -1 if unsuccessful.  The search for an available port
 578    will start at ALPORT and continues with lower numbers.
 579
 580    This function is not part of POSIX and therefore no official
 581    cancellation point.  But due to similarity with an POSIX interface
 582    or due to the implementation it is a cancellation point and
 583    therefore not marked with __THROW.  */
 584 extern int rresvport (int *__alport);
 585 libc_hidden_proto(rresvport)
 586
 587 #if 0
 588 /* FIXME */
 589 /* This is the equivalent function where the protocol can be selected
 590    and which therefore can be used for IPv6.
 591
 592    This function is not part of POSIX and therefore no official
 593    cancellation point.  But due to similarity with an POSIX interface
 594    or due to the implementation it is a cancellation point and
 595    therefore not marked with __THROW.  */
 596 extern int rresvport_af (int *__alport, sa_family_t __af);
 597 #endif
 598 #endif
 599
 600
 601 /* Extension from POSIX.1g.  */
 602 #ifdef  __USE_POSIX
 603 /* Structure to contain information about address of a service provider.  */
 604 struct addrinfo
 605 {
 606   int ai_flags;                 /* Input flags.  */
 607   int ai_family;                /* Protocol family for socket.  */
 608   int ai_socktype;              /* Socket type.  */
 609   int ai_protocol;              /* Protocol for socket.  */
 610   socklen_t ai_addrlen;         /* Length of socket address.  */
 611   struct sockaddr *ai_addr;     /* Socket address for socket.  */
 612   char *ai_canonname;           /* Canonical name for service location.  */
 613   struct addrinfo *ai_next;     /* Pointer to next in list.  */
 614 };
 615
 616 /* Possible values for `ai_flags' field in `addrinfo' structure.  */
 617 # define AI_PASSIVE     0x0001  /* Socket address is intended for `bind'.  */
 618 # define AI_CANONNAME   0x0002  /* Request for canonical name.  */
 619 # define AI_NUMERICHOST 0x0004  /* Don't use name resolution.  */
 620 # define AI_V4MAPPED    0x0008  /* IPv4 mapped addresses are acceptable.  */
 621 # define AI_ALL         0x0010  /* Return IPv4 mapped and IPv6 addresses.  */
 622 # define AI_ADDRCONFIG  0x0020  /* Use configuration of this host to choose
 623                                    returned address type..  */
 624 # ifdef __USE_GNU
 625 #  define AI_IDN        0x0040  /* IDN encode input (assuming it is encoded
 626                                    in the current locale's character set)
 627                                    before looking it up. */
 628 #  define AI_CANONIDN   0x0080  /* Translate canonical name from IDN format. */
 629 #  define AI_IDN_ALLOW_UNASSIGNED 0x0100 /* Don't reject unassigned Unicode
 630                                             code points.  */
 631 #  define AI_IDN_USE_STD3_ASCII_RULES 0x0200 /* Validate strings according to
 632                                                 STD3 rules.  */
 633 # endif
 634 # define AI_NUMERICSERV 0x0400  /* Don't use name resolution.  */
 635
 636 /* Error values for `getaddrinfo' function.  */
 637 # define EAI_BADFLAGS     -1    /* Invalid value for `ai_flags' field.  */
 638 # define EAI_NONAME       -2    /* NAME or SERVICE is unknown.  */
 639 # define EAI_AGAIN        -3    /* Temporary failure in name resolution.  */
 640 # define EAI_FAIL         -4    /* Non-recoverable failure in name res.  */
 641 # define EAI_NODATA       -5    /* No address associated with NAME.  */
 642 # define EAI_FAMILY       -6    /* `ai_family' not supported.  */
 643 # define EAI_SOCKTYPE     -7    /* `ai_socktype' not supported.  */
 644 # define EAI_SERVICE      -8    /* SERVICE not supported for `ai_socktype'.  */
 645 # define EAI_ADDRFAMILY   -9    /* Address family for NAME not supported.  */
 646 # define EAI_MEMORY       -10   /* Memory allocation failure.  */
 647 # define EAI_SYSTEM       -11   /* System error returned in `errno'.  */
 648 # define EAI_OVERFLOW     -12   /* Argument buffer overflow.  */
 649 # ifdef __USE_GNU
 650 #  define EAI_INPROGRESS  -100  /* Processing request in progress.  */
 651 #  define EAI_CANCELED    -101  /* Request canceled.  */
 652 #  define EAI_NOTCANCELED -102  /* Request not canceled.  */
 653 #  define EAI_ALLDONE     -103  /* All requests done.  */
 654 #  define EAI_INTR        -104  /* Interrupted by a signal.  */
 655 #  define EAI_IDN_ENCODE  -105  /* IDN encoding failed.  */
 656 # endif
 657
 658 # define NI_MAXHOST      1025
 659 # define NI_MAXSERV      32
 660
 661 # define NI_NUMERICHOST 1       /* Don't try to look up hostname.  */
 662 # define NI_NUMERICSERV 2       /* Don't convert port number to name.  */
 663 # define NI_NOFQDN      4       /* Only return nodename portion.  */
 664 # define NI_NAMEREQD    8       /* Don't return numeric addresses.  */
 665 # define NI_DGRAM       16      /* Look up UDP service rather than TCP.  */
 666 # ifdef __USE_GNU
 667 #  define NI_IDN        32      /* Convert name from IDN format.  */
 668 #  define NI_IDN_ALLOW_UNASSIGNED 64 /* Don't reject unassigned Unicode
 669                                         code points.  */
 670 #  define NI_IDN_USE_STD3_ASCII_RULES 128 /* Validate strings according to
 671                                              STD3 rules.  */
 672 # endif
 673
 674 /* Translate name of a service location and/or a service name to set of
 675    socket addresses.
 676
 677    This function is a possible cancellation point and therefore not
 678    marked with __THROW.  */
 679 extern int getaddrinfo (__const char *__restrict __name,
 680                         __const char *__restrict __service,
 681                         __const struct addrinfo *__restrict __req,
 682                         struct addrinfo **__restrict __pai);
 683 libc_hidden_proto(getaddrinfo)
 684
 685 /* Free `addrinfo' structure AI including associated storage.  */
 686 extern void freeaddrinfo (struct addrinfo *__ai) __THROW;
 687 libc_hidden_proto(freeaddrinfo)
 688
 689 /* Convert error return from getaddrinfo() to a string.  */
 690 extern __const char *gai_strerror (int __ecode) __THROW;
 691
 692 /* Translate a socket address to a location and service name.
 693
 694    This function is a possible cancellation point and therefore not
 695    marked with __THROW.  */
 696 extern int getnameinfo (__const struct sockaddr *__restrict __sa,
 697                         socklen_t __salen, char *__restrict __host,
 698                         socklen_t __hostlen, char *__restrict __serv,
 699                         socklen_t __servlen, unsigned int __flags);
 700 libc_hidden_proto(getnameinfo)
 701 #endif  /* POSIX */
 702
 703 __END_DECLS
 704
 705 #endif  /* netdb.h */