Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

mcs/class/Mono.Posix/Mono.Unix/PeerCred.cs

@@ -33,11 +33,13 @@ using System.Net.Sockets;
 
 namespace Mono.Unix
 {
+#pragma warning disable 649
 	internal struct PeerCredData {
 		public int pid;
 		public int uid;
 		public int gid;
 	}
+#pragma warning restore 649
 
 	public class PeerCred
 	{

mcs/class/Mono.Posix/Mono.Unix/StdioFileStream.cs

@@ -60,35 +60,43 @@ namespace Mono.Unix {
 
 		public StdioFileStream (string path)
 		{
+			if (path == null)
+				throw new ArgumentNullException ("path");
 			InitStream (Fopen (path, "rb"), true);
 		}
 
 		public StdioFileStream (string path, string mode)
 		{
+			if (path == null)
+				throw new ArgumentNullException ("path");
 			InitStream (Fopen (path, mode), true);
 		}
 
 		public StdioFileStream (string path, FileMode mode)
 		{
+			if (path == null)
+				throw new ArgumentNullException ("path");
 			InitStream (Fopen (path, ToFopenMode (path, mode)), true);
 		}
 
 		public StdioFileStream (string path, FileAccess access)
 		{
+			if (path == null)
+				throw new ArgumentNullException ("path");
 			InitStream (Fopen (path, ToFopenMode (path, access)), true);
 			InitCanReadWrite (access);
 		}
 
 		public StdioFileStream (string path, FileMode mode, FileAccess access)
 		{
+			if (path == null)
+				throw new ArgumentNullException ("path");
 			InitStream (Fopen (path, ToFopenMode (path, mode, access)), true);
 			InitCanReadWrite (access);
 		}
 
 		private static IntPtr Fopen (string path, string mode)
 		{
-			if (path == null)
-				throw new ArgumentNullException ("path");
 			if (path.Length == 0)
 				throw new ArgumentException ("path");
 			if (mode == null)

mcs/class/Mono.Posix/Mono.Unix/UnixSignal.cs

@@ -152,11 +152,13 @@ namespace Mono.Unix {
 
 		// signum, count, write_fd, pipecnt, and pipelock are read from a signal handler thread
 		// count and pipelock are both read and written from the signal handler thread
+#pragma warning disable 649
 		[Map]
 		struct SignalInfo {
 			public int signum, count, read_fd, write_fd, pipecnt, pipelock, have_handler;
 			public IntPtr handler; // Backed-up handler to restore when signal unregistered
 		}
+#pragma warning restore 649
 
 		#region WaitHandle overrides
 		protected unsafe override void Dispose (bool disposing)