text: // Copyright (c) 2010 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef NET_BASE_ADDRESS_FAMILY_H_
  #define NET_BASE_ADDRESS_FAMILY_H_
  
  #include "net/base/net_export.h"
  
  namespace net {
  
  class IPAddress;
  
  // Enum wrapper around the address family types supported by host resolver
  // procedures.
  enum AddressFamily {
    ADDRESS_FAMILY_UNSPECIFIED,   // AF_UNSPEC
    ADDRESS_FAMILY_IPV4,          // AF_INET
    ADDRESS_FAMILY_IPV6,          // AF_INET6
    ADDRESS_FAMILY_LAST = ADDRESS_FAMILY_IPV6
  };
  
  // HostResolverFlags is a bitflag enum used by host resolver procedures to
  // determine the value of addrinfo.ai_flags and work around getaddrinfo
  // peculiarities.
  enum {
    HOST_RESOLVER_CANONNAME = 1 << 0,  // AI_CANONNAME
    // Hint to the resolver proc that only loopback addresses are configured.
    HOST_RESOLVER_LOOPBACK_ONLY = 1 << 1,
    // Indicate the address family was set because no IPv6 support was detected.
    HOST_RESOLVER_DEFAULT_FAMILY_SET_DUE_TO_NO_IPV6 = 1 << 2,
    // The resolver should only invoke getaddrinfo, not DnsClient.
    HOST_RESOLVER_SYSTEM_ONLY = 1 << 3
  };
  typedef int HostResolverFlags;
  
  // Returns AddressFamily for |address|.
  NET_EXPORT AddressFamily GetAddressFamily(const IPAddress& address);
  
  // Maps the given AddressFamily to either AF_INET, AF_INET6 or AF_UNSPEC.
  NET_EXPORT int ConvertAddressFamily(AddressFamily address_family);
  
  }  // namespace net
  
  #endif  // NET_BASE_ADDRESS_FAMILY_H_
  