In terms of network related functionality, rely on Winsock definitions

as much as possible:
	* dtable.cc: Drop including sys/socket.h.
	* fhandler_procnet.cc: Change includes accordingly.
	* fhandler_socket.cc: Ditto.
	(fhandler_socket::listen): Avoid gcc error message initializing sin6.
	(LPFN_WSARECVMSG): Only define when building against w32api headers.
	* net.cc: Change includes accordingly.  Define USE_SYS_TYPES_FD_SET
	and __WSA_ERR_MACROS_DEFINED.  Define _INC_NETIOAPI temporarily and
	explain why.
	(struct _IP_ADAPTER_UNICAST_ADDRESS_LH): Only define when building
	against w32api headers.
	(struct _IP_ADAPTER_ADDRESSES_LH): Ditto.
	(SIO_GET_INTERFACE_LIST): Ditto.
	(ws_freeaddrinfo): Rename from freeaddrinfo so as not to collide with
	Winsock declaration.  Change througout.
	(ws_getaddrinfo): Ditto.
	(ws_getnameinfo): Ditto.
	* select.cc: Include netdb.h after defining USE_SYS_TYPES_FD_SET.
	* syslog.cc: Drop including netinet/in.h.  Define USE_SYS_TYPES_FD_SET
	and include ws2tcpip.h.
	* include/netdb.h (struct addrinfo): Don't define when building Cygwin.
	* include/cygwin/if.h: Don't declare if_xxx functions when building
	Cygwin.
	* include/cygwin/in.h: Disable most definitions when building Cygwin.
	* include/cygwin/socket.h: Disable sockaddr and sockaddr_storage
	definitions when building Cygwin.  Same for MCAST_INCLUDE/MCAST_EXCLUDE.
	* libc/inet_addr.c: Don't define __INSIDE_CYGWIN__ nor
	__INSIDE_CYGWIN_NET__.
	* libc/inet_network.c: Ditto.
	* libc/minires.h: Drop redundant inclusion of netdb.h.  Define
	__INSIDE_CYGWIN_NET__ only before including netdb.h and resolver
	headers.

winsup/cygwin/ChangeLog

@@ -1,3 +1,39 @@
+2012-07-06  Corinna Vinschen  <corinna@vinschen.de>
+
+	In terms of network related functionality, rely on Winsock definitions
+	as much as possible:
+	* dtable.cc: Drop including sys/socket.h.
+	* fhandler_procnet.cc: Change includes accordingly.
+	* fhandler_socket.cc: Ditto.
+	(fhandler_socket::listen): Avoid gcc error message initializing sin6.
+	(LPFN_WSARECVMSG): Only define when building against w32api headers.
+	* net.cc: Change includes accordingly.  Define USE_SYS_TYPES_FD_SET
+	and __WSA_ERR_MACROS_DEFINED.  Define _INC_NETIOAPI temporarily and
+	explain why.
+	(struct _IP_ADAPTER_UNICAST_ADDRESS_LH): Only define when building
+	against w32api headers.
+	(struct _IP_ADAPTER_ADDRESSES_LH): Ditto.
+	(SIO_GET_INTERFACE_LIST): Ditto.
+	(ws_freeaddrinfo): Rename from freeaddrinfo so as not to collide with
+	Winsock declaration.  Change througout.
+	(ws_getaddrinfo): Ditto.
+	(ws_getnameinfo): Ditto.
+	* select.cc: Include netdb.h after defining USE_SYS_TYPES_FD_SET.
+	* syslog.cc: Drop including netinet/in.h.  Define USE_SYS_TYPES_FD_SET
+	and include ws2tcpip.h.
+	* include/netdb.h (struct addrinfo): Don't define when building Cygwin.
+	* include/cygwin/if.h: Don't declare if_xxx functions when building
+	Cygwin.
+	* include/cygwin/in.h: Disable most definitions when building Cygwin.
+	* include/cygwin/socket.h: Disable sockaddr and sockaddr_storage
+	definitions when building Cygwin.  Same for MCAST_INCLUDE/MCAST_EXCLUDE.
+	* libc/inet_addr.c: Don't define __INSIDE_CYGWIN__ nor
+	__INSIDE_CYGWIN_NET__.
+	* libc/inet_network.c: Ditto.
+	* libc/minires.h: Drop redundant inclusion of netdb.h.  Define
+	__INSIDE_CYGWIN_NET__ only before including netdb.h and resolver
+	headers.
+
 2012-07-06  Corinna Vinschen  <corinna@vinschen.de>
 
 	* winbase.h: Throughout use LONG rather than long type to prepare for

winsup/cygwin/dtable.cc

@@ -12,7 +12,6 @@ details. */
 #define  __INSIDE_CYGWIN_NET__
 
 #include "winsup.h"
-#include <sys/socket.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>

winsup/cygwin/fhandler_procnet.cc

@@ -9,7 +9,7 @@ Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
 #define  __INSIDE_CYGWIN_NET__
-
+#define USE_SYS_TYPES_FD_SET
 #include "winsup.h"
 #include "cygerrno.h"
 #include "security.h"
@@ -18,13 +18,9 @@ details. */
 #include "fhandler_virtual.h"
 #include "dtable.h"
 #include "cygheap.h"
-
+#include <ws2tcpip.h>
-#include <netdb.h>
-#define USE_SYS_TYPES_FD_SET
-#include <winsock2.h>
 #include <iphlpapi.h>
 #include <asm/byteorder.h>
-#include <cygwin/in6.h>
 
 #define _COMPILING_NEWLIB
 #include <dirent.h>

winsup/cygwin/fhandler_socket.cc

@@ -12,24 +12,21 @@
 /* #define DEBUG_NEST_ON 1 */
 
 #define  __INSIDE_CYGWIN_NET__
+#define USE_SYS_TYPES_FD_SET
 
 #include "winsup.h"
-#include <sys/un.h>
-#include <asm/byteorder.h>
-
-#include <stdlib.h>
-#define USE_SYS_TYPES_FD_SET
-#include <winsock2.h>
-#include <mswsock.h>
-#include <iphlpapi.h>
 #include "cygerrno.h"
 #include "security.h"
-#include "cygwin/version.h"
-#include "perprocess.h"
 #include "path.h"
 #include "fhandler.h"
 #include "dtable.h"
 #include "cygheap.h"
+#include <ws2tcpip.h>
+#include <mswsock.h>
+#include <iphlpapi.h>
+#include <asm/byteorder.h>
+#include "cygwin/version.h"
+#include "perprocess.h"
 #include "shared_info.h"
 #include "sigproc.h"
 #include "wininfo.h"
@@ -37,7 +34,7 @@
 #include <sys/param.h>
 #include <sys/acl.h>
 #include "cygtls.h"
-#include "cygwin/in6.h"
+#include <sys/un.h>
 #include "ntdll.h"
 #include "miscfuncs.h"
 
@@ -1129,14 +1126,9 @@ fhandler_socket::listen (int backlog)
 	}
       else if (get_addr_family () == AF_INET6)
 	{
-	  struct sockaddr_in6 sin6 =
+	  struct sockaddr_in6 sin6;
-	    {
+	  memset (&sin6, 0, sizeof sin6);
-	      sin6_family: AF_INET6,
+	  sin6.sin6_family = AF_INET6;
-	      sin6_port: 0,
-	      sin6_flowinfo: 0,
-	      sin6_addr: {{IN6ADDR_ANY_INIT}},
-	      sin6_scope_id: 0
-	    };
 	  if (!::bind (get_socket (), (struct sockaddr *) &sin6, sizeof sin6))
 	    res = ::listen (get_socket (), backlog);
 	}
@@ -1359,10 +1351,12 @@ fhandler_socket::readv (const struct iovec *const iov, const int iovcnt,
 }
 
 extern "C" {
+#ifndef __MINGW64_VERSION_MAJOR
 #define WSAID_WSARECVMSG \
 	  {0xf689d7c8,0x6f1f,0x436b,{0x8a,0x53,0xe5,0x4f,0xe3,0x51,0xc3,0x22}};
 typedef int (WSAAPI *LPFN_WSARECVMSG)(SOCKET,LPWSAMSG,LPDWORD,LPWSAOVERLAPPED,
 				      LPWSAOVERLAPPED_COMPLETION_ROUTINE);
+#endif
 int WSAAPI WSASendMsg(SOCKET,LPWSAMSG,DWORD,LPDWORD, LPWSAOVERLAPPED,
 		      LPWSAOVERLAPPED_COMPLETION_ROUTINE);
 };

winsup/cygwin/include/cygwin/if.h

@@ -111,10 +111,12 @@ struct ifconf
 #define ifc_buf ifc_ifcu.ifcu_buf               /* buffer address       */
 #define ifc_req ifc_ifcu.ifcu_req               /* array of structures  */
 
+#ifndef __INSIDE_CYGWIN_NET__
 extern unsigned             if_nametoindex (const char *);
 extern char                *if_indextoname (unsigned, char *);
 extern struct if_nameindex *if_nameindex (void);
 extern void                 if_freenameindex (struct if_nameindex *);
+#endif
 
 #ifdef __cplusplus
 };

winsup/cygwin/include/cygwin/in.h

@@ -23,6 +23,8 @@
 typedef uint16_t in_port_t;
 typedef uint32_t in_addr_t;
 
+#ifndef __INSIDE_CYGWIN_NET__
+
 /* Standard well-defined IP protocols.  If you ever add one here, don't
    forget to define it below. */
 enum
@@ -260,4 +262,6 @@ struct sockaddr_in
 #ifdef AF_INET6
 #include <cygwin/in6.h>
 #endif
+#endif
+
 #endif	/* _CYGWIN_IN_H */

winsup/cygwin/include/cygwin/socket.h

@@ -26,6 +26,7 @@ typedef int socklen_t;
 
 typedef uint16_t sa_family_t;
 
+#ifndef __INSIDE_CYGWIN_NET__
 struct sockaddr {
   sa_family_t		sa_family;	/* address family, AF_xxx	*/
   char			sa_data[14];	/* 14 bytes of protocol address	*/
@@ -44,6 +45,7 @@ struct sockaddr_storage {
   int64_t		__ss_align;
   char			_ss_pad2[_SS_PAD2SIZE];
 };
+#endif
 
 #include <asm/socket.h>			/* arch-dependent defines	*/
 #include <cygwin/sockios.h>		/* the SIOCxxx I/O controls	*/
@@ -269,8 +271,10 @@ struct OLD_msghdr
 #define MCAST_JOIN_SOURCE_GROUP         45
 #define MCAST_LEAVE_SOURCE_GROUP        46
 
+#ifndef __INSIDE_CYGWIN_NET__
 #define MCAST_INCLUDE                    0
 #define MCAST_EXCLUDE                    1
+#endif
 
 /* Old WinSock1 values, needed internally */
 #ifdef __INSIDE_CYGWIN__

winsup/cygwin/include/netdb.h

@@ -117,6 +117,7 @@ struct rpcent {
 	int	r_number;	/* rpc program number */
 };
 
+#ifndef __INSIDE_CYGWIN_NET__
 struct addrinfo {
   int             ai_flags;		/* input flags */
   int             ai_family;		/* address family of socket */
@@ -127,6 +128,7 @@ struct addrinfo {
   struct sockaddr *ai_addr;		/* socket address of socket */
   struct addrinfo *ai_next;		/* pointer to next in list */
 };
+#endif
 
 /*
  * Error return codes from gethostbyname() and gethostbyaddr()

winsup/cygwin/libc/inet_addr.c

@@ -72,8 +72,7 @@ static const char rcsid[] = "$Id$";
 #ifndef __CYGWIN__
 __FBSDID("$FreeBSD$");
 #else
-#define __INSIDE_CYGWIN__
+#include "winsup.h"
-#define  __INSIDE_CYGWIN_NET__
 #endif
 
 #ifndef __CYGWIN__

winsup/cygwin/libc/inet_network.c

@@ -34,8 +34,7 @@ static const char sccsid[] = "@(#)inet_network.c	8.1 (Berkeley) 6/4/93";
 #ifndef __CYGWIN__
 __FBSDID("$FreeBSD$");
 #else
-#define __INSIDE_CYGWIN__
+#include "winsup.h"
-#define  __INSIDE_CYGWIN_NET__
 #endif
 
 #ifndef __CYGWIN__

winsup/cygwin/libc/minires.h

@@ -10,13 +10,10 @@ This software is a copyrighted work licensed under the terms of the
 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
-#define  __INSIDE_CYGWIN_NET__
-
 #include "winsup.h"
 #include <string.h>
 #include <malloc.h>
 #include <stdlib.h>
-#include <netdb.h>
 #include <ctype.h>
 #include <sys/time.h>
 #include <sys/socket.h>
@@ -27,6 +24,7 @@ details. */
 #include <stdio.h>
 #include <stdarg.h>
 #include <sys/unistd.h>
+#define  __INSIDE_CYGWIN_NET__
 #include <netdb.h>
 #include <arpa/nameser.h>
 #include <resolv.h>

winsup/cygwin/select.cc

@@ -21,9 +21,9 @@ details. */
 
 #include <wingdi.h>
 #include <winuser.h>
-#include <netdb.h>
 #define USE_SYS_TYPES_FD_SET
 #include <winsock2.h>
+#include <netdb.h>
 #include "cygerrno.h"
 #include "security.h"
 #include "path.h"

winsup/cygwin/syslog.cc

@@ -10,15 +10,15 @@ Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
 #define  __INSIDE_CYGWIN_NET__
-
+#define USE_SYS_TYPES_FD_SET
 #include "winsup.h"
+#include <ws2tcpip.h>
+#include <iphlpapi.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <syslog.h>
 #include <unistd.h>
 #include <sys/un.h>
-#include <netinet/in.h>
-#include <iphlpapi.h>
 #include "cygerrno.h"
 #include "security.h"
 #include "path.h"