Expose ChildProcessId from PTY backends and TerminalControl

Author: nickprotop

SharpConsoleUI/Controls/Terminal/IPtyBackend.cs

@@ -17,4 +17,7 @@ internal interface IPtyBackend : IDisposable
 
     /// <summary>Write keyboard/mouse bytes to the PTY.</summary>
     void Write(byte[] buf, int count);
+
+    /// <summary>The OS process ID of the child process running inside the PTY.</summary>
+    int ChildProcessId { get; }
 }

SharpConsoleUI/Controls/Terminal/LinuxPtyBackend.cs

@@ -33,6 +33,8 @@ public LinuxPtyBackend(string exe, string[]? args, int rows, int cols, string? w
         PtyNative.close(slave);  // parent closes its copy of the slave fd
     }
 
+    public int ChildProcessId => _shimProc.Id;
+
     public int Read(byte[] buf, int count) => PtyNative.read(_masterFd, buf, count);
 
     public void Write(byte[] buf, int count) => PtyNative.write(_masterFd, buf, count);

SharpConsoleUI/Controls/Terminal/TerminalControl.cs

@@ -39,6 +39,9 @@ public sealed class TerminalControl
     /// <summary>Window title derived from the launched executable name.</summary>
     public string Title { get; }
 
+    /// <summary>The OS process ID of the child process running inside the PTY.</summary>
+    public int ProcessId => _pty.ChildProcessId;
+
     /// <summary>Raised on the PTY read thread when the spawned process exits.</summary>
     public event EventHandler? ProcessExited;
 

SharpConsoleUI/Controls/Terminal/WindowsPtyBackend.cs

@@ -16,6 +16,7 @@ internal sealed class WindowsPtyBackend : IPtyBackend
 {
     private IntPtr  _hPcon    = IntPtr.Zero;
     private IntPtr  _hProcess = IntPtr.Zero;
+    private int     _processId;
     private Stream? _inputStream;   // parent writes keyboard input here
     private Stream? _outputStream;  // parent reads terminal output from here
     private int _disposed = 0;
@@ -91,6 +92,7 @@ public WindowsPtyBackend(string exe, string[]? args, int rows, int cols, string?
             }
 
             _hProcess = pi.hProcess;
+            _processId = pi.dwProcessId;
             WinPtyNative.CloseHandle(pi.hThread); // we don't need the thread handle
         }
         finally
@@ -102,6 +104,8 @@ public WindowsPtyBackend(string exe, string[]? args, int rows, int cols, string?
 
     // ── IPtyBackend ──────────────────────────────────────────────────────────
 
+    public int ChildProcessId => _processId;
+
     public int Read(byte[] buf, int count)
     {
         if (_outputStream == null) return 0;