winamp/Src/Components/wac_network/wac_network_dns.h

/*
** JNetLib
** Copyright (C) 2000-2007 Nullsoft, Inc.
** Author: Justin Frankel
** File: asyncdns.h - JNL portable asynchronous DNS interface
** License: see jnetlib.h
**
** Usage:
**   1. Create wa::Components::WAC_Network_AsyncDNS object, optionally with the number of cache entries.
**   2. call resolve() to resolve a hostname into an address. The return value of
**      resolve is 0 on success (host successfully resolved), 1 on wait (meaning
**      try calling resolve() with the same hostname in a few hundred milliseconds
**      or so), or -1 on error (i.e. the host can't resolve).
**   3. call reverse() to do reverse dns (ala resolve()).
**   4. enjoy.
*/

#ifndef NULLSOFT_WAC_NETWORK_ASYNCDNS_H
#define NULLSOFT_WAC_NETWORK_ASYNCDNS_H

#include "netinc.h"

#include "wac_network_dns_api.h"

struct cache_entry;

//#define JNL_AUTODNS ((wa::Components::WAC_Network_AsyncDNS *)-1)
//enum
//{
//	DNS_RESOLVE_UNRESOLVABLE = -1,
//	DNS_RESOLVE_SUCCESS      = 0,
//	DNS_RESOLVE_WAIT         = 1,
//};
//
//enum
//{
//	DNS_REVERSE_UNRESOLVABLE = -1,
//	DNS_REVERSE_SUCCESS      = 0,
//	DNS_REVERSE_WAIT         = 1,
//};

namespace wa
{
	namespace Components
	{
		class WAC_Network_AsyncDNS : public api_dns
		{
		public:
			WAC_Network_AsyncDNS( int max_cache_entries = 64 );
			~WAC_Network_AsyncDNS();

			int resolve( const char *hostname, unsigned short port, addrinfo **addr, int sockettype ); // return 0 on success, 1 on wait, -1 on unresolvable
			static int resolvenow( const char *hostname, unsigned short port, addrinfo **addr, int sockettype ); // return 0 on success, -1 on unresolvable

		private:
			cache_entry *m_cache;
			int m_cache_size;
			volatile int m_thread_kill;

#ifdef _WIN32
			HANDLE m_thread;
			static unsigned long WINAPI _threadfunc( LPVOID _d );
#else
			pthread_t m_thread;
			static unsigned int _threadfunc( void *_d );
#endif

			void makesurethreadisrunning( void );

			protected:
			RECVS_DISPATCH;
		};
	}
}

#endif  //!NULLSOFT_WAC_NETWORK_ASYNCDNS_H