contrib/cvs-1.12/lib/getaddrinfo.h

   1 /* Get address information.
   2    Copyright (C) 1996-2002, 2003, 2004, 2005 Free Software Foundation, Inc.
   3    Contributed by Simon Josefsson <simon@josefsson.org>.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #ifndef GETADDRINFO_H
  20 # define GETADDRINFO_H
  21
  22 /* Get getaddrinfo declarations, if available.  Also get 'socklen_t',
  23    and 'struct sockaddr' via sys/types.h which are used below. */
  24 # include <sys/types.h>
  25 # include <sys/socket.h>
  26 # include <netdb.h>
  27
  28 # if !HAVE_GETADDRINFO
  29
  30 /* Structure to contain information about address of a service provider.  */
  31 struct addrinfo
  32 {
  33   int ai_flags;                 /* Input flags.  */
  34   int ai_family;                /* Protocol family for socket.  */
  35   int ai_socktype;              /* Socket type.  */
  36   int ai_protocol;              /* Protocol for socket.  */
  37   socklen_t ai_addrlen;         /* Length of socket address.  */
  38   struct sockaddr *ai_addr;     /* Socket address for socket.  */
  39   char *ai_canonname;           /* Canonical name for service location.  */
  40   struct addrinfo *ai_next;     /* Pointer to next in list.  */
  41 };
  42
  43 /* Possible values for `ai_flags' field in `addrinfo' structure.  */
  44 # define AI_PASSIVE     0x0001  /* Socket address is intended for `bind'.  */
  45 # define AI_CANONNAME   0x0002  /* Request for canonical name.  */
  46 # define AI_NUMERICHOST 0x0004  /* Don't use name resolution.  */
  47 # define AI_V4MAPPED    0x0008  /* IPv4 mapped addresses are acceptable.  */
  48 # define AI_ALL         0x0010  /* Return IPv4 mapped and IPv6 addresses.  */
  49 # define AI_ADDRCONFIG  0x0020  /* Use configuration of this host to choose
  50                                    returned address type..  */
  51
  52 /* Error values for `getaddrinfo' function.  */
  53 # define EAI_BADFLAGS     -1    /* Invalid value for `ai_flags' field.  */
  54 # define EAI_NONAME       -2    /* NAME or SERVICE is unknown.  */
  55 # define EAI_AGAIN        -3    /* Temporary failure in name resolution.  */
  56 # define EAI_FAIL         -4    /* Non-recoverable failure in name res.  */
  57 # define EAI_NODATA       -5    /* No address associated with NAME.  */
  58 # define EAI_FAMILY       -6    /* `ai_family' not supported.  */
  59 # define EAI_SOCKTYPE     -7    /* `ai_socktype' not supported.  */
  60 # define EAI_SERVICE      -8    /* SERVICE not supported for `ai_socktype'.  */
  61 # define EAI_ADDRFAMILY   -9    /* Address family for NAME not supported.  */
  62 # define EAI_MEMORY       -10   /* Memory allocation failure.  */
  63 # define EAI_SYSTEM       -11   /* System error returned in `errno'.  */
  64 # define EAI_OVERFLOW     -12   /* Argument buffer overflow.  */
  65 # ifdef __USE_GNU
  66 #  define EAI_INPROGRESS  -100  /* Processing request in progress.  */
  67 #  define EAI_CANCELED    -101  /* Request canceled.  */
  68 #  define EAI_NOTCANCELED -102  /* Request not canceled.  */
  69 #  define EAI_ALLDONE     -103  /* All requests done.  */
  70 #  define EAI_INTR        -104  /* Interrupted by a signal.  */
  71 #  define EAI_IDN_ENCODE  -105  /* IDN encoding failed.  */
  72 # endif
  73
  74 /* Translate name of a service location and/or a service name to set of
  75    socket addresses.
  76    For more details, see the POSIX:2001 specification
  77    <http://www.opengroup.org/susv3xsh/getaddrinfo.html>.  */
  78 extern int getaddrinfo (const char *restrict nodename,
  79                         const char *restrict servname,
  80                         const struct addrinfo *restrict hints,
  81                         struct addrinfo **restrict res);
  82
  83 /* Free `addrinfo' structure AI including associated storage.
  84    For more details, see the POSIX:2001 specification
  85    <http://www.opengroup.org/susv3xsh/getaddrinfo.html>.  */
  86 extern void freeaddrinfo (struct addrinfo *ai);
  87
  88 /* Convert error return from getaddrinfo() to a string.
  89    For more details, see the POSIX:2001 specification
  90    <http://www.opengroup.org/susv3xsh/gai_strerror.html>.  */
  91 extern const char *gai_strerror (int ecode);
  92
  93 # endif /* !HAVE_GETADDRINFO */
  94
  95 #endif /* GETADDRINFO_H */