Close process query handles

src/Artemis.Core/Extensions/ProcessExtensions.cs

@@ -21,10 +21,20 @@ public static class ProcessExtensions
     {
         int capacity = 2000;
         StringBuilder builder = new(capacity);
-        nint ptr = OpenProcess(ProcessAccessFlags.QueryLimitedInformation, false, p.Id);
+        nint processHandle = OpenProcess(ProcessAccessFlags.QueryLimitedInformation, false, p.Id);
-        if (!QueryFullProcessImageName(ptr, 0, builder, ref capacity)) return string.Empty;
+        if (processHandle == nint.Zero)
+            return string.Empty;
 
-        return builder.ToString();
+        try
+        {
+            return QueryFullProcessImageName(processHandle, 0, builder, ref capacity)
+                ? builder.ToString()
+                : string.Empty;
+        }
+        finally
+        {
+            CloseHandle(processHandle);
+        }
     }
 
     [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
@@ -33,9 +43,13 @@ public static class ProcessExtensions
     [DllImport("kernel32.dll")]
     private static extern nint OpenProcess(ProcessAccessFlags processAccess, bool bInheritHandle, int processId);
 
+    [DllImport("kernel32.dll")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool CloseHandle(nint hObject);
+
     [Flags]
     private enum ProcessAccessFlags : uint
     {
         QueryLimitedInformation = 0x00001000
     }
-}
+}

src/Artemis.Core/Services/ProcessMonitoring/ProcessMonitor.Win32.cs

@@ -69,6 +69,10 @@ public static unsafe partial class ProcessMonitor
     [LibraryImport("kernel32.dll")]
     private static partial nint OpenProcess(ProcessAccessFlags processAccess, [MarshalAs(UnmanagedType.Bool)] bool bInheritHandle, int processId);
 
+    [LibraryImport("kernel32.dll")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static partial bool CloseHandle(nint hObject);
+
     [Flags]
     private enum ProcessAccessFlags : uint
     {
@@ -190,11 +194,20 @@ public static unsafe partial class ProcessMonitor
     {
         int capacity = byte.MaxValue;
         char[] buffer = new char[capacity];
-        nint ptr = OpenProcess(ProcessAccessFlags.QueryLimitedInformation, false, processId);
+        nint processHandle = OpenProcess(ProcessAccessFlags.QueryLimitedInformation, false, processId);
+        if (processHandle == nint.Zero)
+            return string.Empty;
 
-        return QueryFullProcessImageName(ptr, 0, buffer, ref capacity)
+        try
-                   ? new string(buffer, 0, capacity)
+        {
-                   : string.Empty;
+            return QueryFullProcessImageName(processHandle, 0, buffer, ref capacity)
+                ? new string(buffer, 0, capacity)
+                : string.Empty;
+        }
+        finally
+        {
+            CloseHandle(processHandle);
+        }
     }
 
     // This function generates the short form of process name.
@@ -228,4 +241,4 @@ public static unsafe partial class ProcessMonitor
     private static uint GetEstimatedBufferSize(uint actualSize) => actualSize + (1024 * 10);
 
     #endregion
-}
+}