* net.cc (ga_dup): New function, taken from ga_clone with v4-in-v6

	mapping addition.
	(ga_clone): Just call ga_dup from here.
	(ga_duplist): New function to duplicate list of struct addrinfo.
	(ga_echeck): Don't check a_flags, it already happened in
	cygwin_getaddrinfo.
	(cygwin_freeaddrinfo): Always call ipv4_freeaddrinfo.
	(cygwin_getaddrinfo): Use new wincap.supports_all_posix_ai_flags
	flag rather than wincap.has_gaa_on_link_prefix.  Always duplicate
	WinSock's addrinfo list to a self-allocated list.  Handle AI_V4MAPPED
	for pre-Vista platforms supporting getaddrinfo.
	* wincap.h (wincapc::supports_all_posix_ai_flags): New element.
	* wincap.cc: Implement above element throughout.
	* include/netdb.h: Note how AI_ADDRCONFIG is not supported pre-Vista.
	Remove superfluous comment.

1 files changed, 13 insertions, 0 deletions

diff --git a/winsup/cygwin/wincap.cc b/winsup/cygwin/wincap.cc
index 7e9f71069..b26c78f84 100644
--- a/winsup/cygwin/wincap.cc
+++ b/winsup/cygwin/wincap.cc
@@ -74,6 +74,7 @@ static NO_COPY wincaps wincap_unknown = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:false,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_95 = {
@@ -139,6 +140,7 @@ static NO_COPY wincaps wincap_95 = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:false,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_95osr2 = {
@@ -204,6 +206,7 @@ static NO_COPY wincaps wincap_95osr2 = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:false,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_98 = {
@@ -269,6 +272,7 @@ static NO_COPY wincaps wincap_98 = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:false,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_98se = {
@@ -334,6 +338,7 @@ static NO_COPY wincaps wincap_98se = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:false,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_me = {
@@ -399,6 +404,7 @@ static NO_COPY wincaps wincap_me = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:false,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_nt3 = {
@@ -464,6 +470,7 @@ static NO_COPY wincaps wincap_nt3 = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:false,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_nt4 = {
@@ -529,6 +536,7 @@ static NO_COPY wincaps wincap_nt4 = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:false,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_nt4sp4 = {
@@ -594,6 +602,7 @@ static NO_COPY wincaps wincap_nt4sp4 = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:false,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_2000 = {
@@ -659,6 +668,7 @@ static NO_COPY wincaps wincap_2000 = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:false,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_xp = {
@@ -724,6 +734,7 @@ static NO_COPY wincaps wincap_xp = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:true,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_2003 = {
@@ -789,6 +800,7 @@ static NO_COPY wincaps wincap_2003 = {
   has_recycle_dot_bin:false,
   has_gaa_prefixes:true,
   has_gaa_on_link_prefix:false,
+  supports_all_posix_ai_flags:false,
 };
 
 static NO_COPY wincaps wincap_vista = {
@@ -854,6 +866,7 @@ static NO_COPY wincaps wincap_vista = {
   has_recycle_dot_bin:true,
   has_gaa_prefixes:true,
   has_gaa_on_link_prefix:true,
+  supports_all_posix_ai_flags:true,
 };
 
 wincapc wincap __attribute__((section (".cygwin_dll_common"), shared));