Ignore some uds tests

Author: Berrysoft

library/std/src/os/unix/net/addr.rs

@@ -240,7 +240,7 @@ impl SocketAddr {
 
         // macOS seems to return a len of 16 and a zeroed sun_path for unnamed addresses
         if len == 0
-            || (cfg!(not(any(target_os = "linux", target_os = "android")))
+            || (cfg!(not(any(target_os = "linux", target_os = "android", target_os = "cygwin")))
                 && self.addr.sun_path[0] == 0)
         {
             AddressKind::Unnamed

library/std/src/os/unix/net/tests.rs

@@ -289,6 +289,7 @@ fn test_unix_datagram() {
 
 #[test]
 #[cfg_attr(target_os = "android", ignore)] // Android SELinux rules prevent creating Unix sockets
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin autobinds an address
 fn test_unnamed_unix_datagram() {
     let dir = tmpdir();
     let path1 = dir.path().join("sock1");
@@ -307,6 +308,7 @@ fn test_unnamed_unix_datagram() {
 
 #[test]
 #[cfg_attr(target_os = "android", ignore)] // Android SELinux rules prevent creating Unix sockets
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin fails to determine the addr type from recvfrom
 fn test_unix_datagram_connect_to_recv_addr() {
     let dir = tmpdir();
     let path1 = dir.path().join("sock1");
@@ -332,6 +334,7 @@ fn test_unix_datagram_connect_to_recv_addr() {
 
 #[test]
 #[cfg_attr(target_os = "android", ignore)] // Android SELinux rules prevent creating Unix sockets
+#[cfg_attr(target_os = "cygwin", ignore)] // Cygwin autobinds an address
 fn test_connect_unix_datagram() {
     let dir = tmpdir();
     let path1 = dir.path().join("sock1");