Fix compiler errors and new warnings

Author: pgrawehr

src/System.Device.Gpio/Interop/Unix/libbcm_host/Interop.libbcmhost.cs

@@ -9,7 +9,9 @@
 
 internal partial class Interop
 {
+#pragma warning disable CS8981 // The type name only contains lower-cased ascii characters. Such names may become reserved for the language.
     internal partial class libbcmhost
+#pragma warning restore CS8981 // The type name only contains lower-cased ascii characters. Such names may become reserved for the language.
     {
         private const string LibbcmhostLibrary = "libbcm_host";
 

src/System.Device.Gpio/System/Diagnostics/CodeAnalysis/ExperimentalAttribute.cs

@@ -14,7 +14,7 @@
     <SystemDeviceModelPath>$(MSBuildThisFileDirectory)$(SystemDeviceModelProjectName)/$(SystemDeviceModelProjectName).csproj</SystemDeviceModelPath>
     <CommonProjectName>Common</CommonProjectName>
     <CommonProjectPath>$(MSBuildThisFileDirectory)$(CommonProjectName)/$(CommonProjectName).csproj</CommonProjectPath>
-    <LangVersion>9</LangVersion>
+    <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 

src/devices/Directory.Build.props

@@ -241,7 +241,7 @@ internal struct v4l2_meta_format
     }
 
     [StructLayout(LayoutKind.Explicit)]
-    internal unsafe struct fmt
+    internal unsafe struct V412_Fmt
     {
         [FieldOffset(0)]
         public v4l2_pix_format pix;
@@ -263,7 +263,7 @@ internal unsafe struct fmt
     internal struct v4l2_format
     {
         public v4l2_buf_type type;
-        public fmt fmt;
+        public V412_Fmt fmt;
     }
 
     [StructLayout(LayoutKind.Sequential)]
@@ -339,7 +339,9 @@ internal struct v4l2_buffer
         public v4l2_field field;
 
         [StructLayout(LayoutKind.Sequential)]
+#pragma warning disable CS8981 // The type name only contains lower-cased ascii characters. Such names may become reserved for the language.
         public struct timeval
+#pragma warning restore CS8981 // The type name only contains lower-cased ascii characters. Such names may become reserved for the language.
         {
             public nint tv_sec;
             public nint tv_usec;

src/devices/Media/VideoDevice/Devices/Interop.videodev2.struct.cs

@@ -404,7 +404,7 @@ private unsafe void SetVideoConnectionSettings()
             InteropVideodev2.v4l2_format format = new InteropVideodev2.v4l2_format
             {
                 type = InteropVideodev2.v4l2_buf_type.V4L2_BUF_TYPE_VIDEO_CAPTURE,
-                fmt = new InteropVideodev2.fmt
+                fmt = new InteropVideodev2.V412_Fmt
                 {
                     pix = new InteropVideodev2.v4l2_pix_format
                     {

src/devices/Media/VideoDevice/Devices/UnixVideoDevice.cs

@@ -69,8 +69,8 @@ public void GetStream()
 
             HttpContext.Response.StatusCode = 200;
             HttpContext.Response.ContentType = "multipart/x-mixed-replace; boundary=--frame";
-            HttpContext.Response.Headers.Add("Connection", "Keep-Alive");
-            HttpContext.Response.Headers.Add("CacheControl", "no-cache");
+            HttpContext.Response.Headers["Connection"] = "Keep-Alive";
+            HttpContext.Response.Headers["CacheControl"] = "no-cache";
             _camera.NewImageReady += WriteBufferBody;
 
             try
@@ -122,8 +122,8 @@ public void GetModifiedStream()
 
             HttpContext.Response.StatusCode = 200;
             HttpContext.Response.ContentType = "multipart/x-mixed-replace; boundary=--frame";
-            HttpContext.Response.Headers.Add("Connection", "Keep-Alive");
-            HttpContext.Response.Headers.Add("CacheControl", "no-cache");
+            HttpContext.Response.Headers["Connection"] = "Keep-Alive";
+            HttpContext.Response.Headers["CacheControl"] = "no-cache";
             _camera.NewImageReady += WriteModifiedBufferBody;
 
             try

src/devices/Media/VideoDevice/samples/MjpegStream/Controllers/Image.cs

@@ -34,7 +34,7 @@ internal class Interop
         private static extern int CreateNativeSocket(int domain, int type, CanProtocol protocol);
 
         [DllImport("libc", EntryPoint = "ioctl", CallingConvention = CallingConvention.Cdecl)]
-        private static extern int Ioctl3(int fd, uint request, ref ifreq ifr);
+        private static extern int Ioctl3(int fd, uint request, ref InterfaceIndexQuery ifr);
 
         [DllImport("libc", EntryPoint = "bind", CallingConvention = CallingConvention.Cdecl)]
         private static extern int BindSocket(int fd, ref CanSocketAddress addr, uint addrlen);
@@ -126,17 +126,17 @@ private static unsafe void BindToInterface(int fd, string interfaceName)
         private static unsafe int GetInterfaceIndex(int fd, string name)
         {
             const uint SIOCGIFINDEX = 0x8933;
-            const int MaxLen = ifreq.IFNAMSIZ - 1;
+            const int maxLen = InterfaceIndexQuery.IFNAMSIZ - 1;
 
-            if (name.Length >= MaxLen)
+            if (name.Length >= maxLen)
             {
-                throw new ArgumentException($"Value exceeds maximum allowed length of {MaxLen} size.", nameof(name));
+                throw new ArgumentException($"Value exceeds maximum allowed length of {maxLen} size.", nameof(name));
             }
 
-            ifreq ifr = new ifreq();
-            fixed (char* inIntefaceName = name)
+            InterfaceIndexQuery ifr = new InterfaceIndexQuery();
+            fixed (char* inInterfaceName = name)
             {
-                int written = Encoding.ASCII.GetBytes(inIntefaceName, name.Length, ifr.ifr_name, MaxLen);
+                int written = Encoding.ASCII.GetBytes(inInterfaceName, name.Length, ifr.ifr_name, maxLen);
                 ifr.ifr_name[written] = 0;
             }
 
@@ -149,7 +149,7 @@ private static unsafe int GetInterfaceIndex(int fd, string name)
             return ifr.ifr_ifindex;
         }
 
-        internal unsafe struct ifreq
+        internal unsafe struct InterfaceIndexQuery
         {
             internal const int IFNAMSIZ = 16;
             public fixed byte ifr_name[IFNAMSIZ];

src/devices/SocketCan/Interop.cs

@@ -56,7 +56,7 @@ public static unsafe void ZeroMemory(ref byte b, uint byteLength)
         {
             fixed (byte* bytePointer = &b)
             {
-                ZeroMemory(bytePointer, byteLength);
+                ZeroMemory((void*)bytePointer, byteLength);
             }
         }