From da9d3fc42036e6fb93b3eda8400f25e19831b8c7 Mon Sep 17 00:00:00 2001
From: Levi Gillis <gillislevi@gmail.com>
Date: Wed, 25 Mar 2026 14:28:37 +0100
Subject: [PATCH 1/2] Add ability to send posix/ansi signals

---
 src/Renci.SshNet/CommandSignal.cs | 74 +++++++++++++++++++++++++++++++
 src/Renci.SshNet/SshCommand.cs    | 67 ++++++++++++++++++++++++++++
 2 files changed, 141 insertions(+)
 create mode 100644 src/Renci.SshNet/CommandSignal.cs

diff --git a/src/Renci.SshNet/CommandSignal.cs b/src/Renci.SshNet/CommandSignal.cs
new file mode 100644
index 000000000..5d37c24c6
--- /dev/null
+++ b/src/Renci.SshNet/CommandSignal.cs
@@ -0,0 +1,74 @@
+namespace Renci.SshNet
+{
+    /// <summary>
+    /// The ssh compatible POSIX/ANSI signals with their libc compatible values.
+    /// </summary>
+#pragma warning disable CA1720 // Identifier contains type name
+    public enum CommandSignal
+    {
+        /// <summary>
+        /// Hangup (POSIX).
+        /// </summary>
+        HUP = 1,
+
+        /// <summary>
+        /// Interrupt (ANSI).
+        /// </summary>
+        INT = 2,
+
+        /// <summary>
+        /// Quit (POSIX).
+        /// </summary>
+        QUIT = 3,
+
+        /// <summary>
+        /// Illegal instruction (ANSI).
+        /// </summary>
+        ILL = 4,
+
+        /// <summary>
+        /// Abort (ANSI).
+        /// </summary>
+        ABRT = 6,
+
+        /// <summary>
+        /// Floating-point exception (ANSI).
+        /// </summary>
+        FPE = 8,
+
+        /// <summary>
+        /// Kill, unblockable (POSIX).
+        /// </summary>
+        KILL = 9,
+
+        /// <summary>
+        /// User-defined signal 1 (POSIX).
+        /// </summary>
+        USR1 = 10,
+
+        /// <summary>
+        /// Segmentation violation (ANSI).
+        /// </summary>
+        SEGV = 11,
+
+        /// <summary>
+        /// User-defined signal 2 (POSIX).
+        /// </summary>
+        USR2 = 12,
+
+        /// <summary>
+        /// Broken pipe (POSIX).
+        /// </summary>
+        PIPE = 13,
+
+        /// <summary>
+        /// Alarm clock (POSIX).
+        /// </summary>
+        ALRM = 14,
+
+        /// <summary>
+        /// Termination (ANSI).
+        /// </summary>
+        TERM = 15,
+    }
+}
diff --git a/src/Renci.SshNet/SshCommand.cs b/src/Renci.SshNet/SshCommand.cs
index ce1042244..460e6c30e 100644
--- a/src/Renci.SshNet/SshCommand.cs
+++ b/src/Renci.SshNet/SshCommand.cs
@@ -478,6 +478,73 @@ public void CancelAsync(bool forceKill = false, int millisecondsTimeout = 500)
             }
         }
 
+        private static string? GetSignalName(CommandSignal signal)
+        {
+#if NETCOREAPP
+            return Enum.GetName(signal);
+#else
+
+            // Boxes signal, but Enum.GetName does not have a non-boxing overload prior to .NET Core.
+            return Enum.GetName(typeof(CommandSignal), signal);
+#endif
+        }
+
+        /// <summary>
+        /// Tries to send a POSIX/ANSI signal to the remote process executing the command, such as SIGINT or SIGTERM.
+        /// </summary>
+        /// <param name="signal">The signal to send</param>
+        /// <returns>If the signal was sent.</returns>
+        public bool TrySendSignal(CommandSignal signal)
+        {
+            var signalName = GetSignalName(signal);
+            if (signalName is null)
+            {
+                return false;
+            }
+
+            if (_tcs is null || _tcs.Task.IsCompleted || _channel?.IsOpen != true)
+            {
+                return false;
+            }
+
+            try
+            {
+                // Try to send the cancellation signal.
+                return _channel.SendSignalRequest(signalName);
+            }
+            catch (Exception)
+            {
+                // Exception can be ignored since we are in a Try method
+                // Possible exceptions here: InvalidOperationException, SshConnectionException, SshOperationTimeoutException
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// Tries to send a POSIX/ANSI signal to the remote process executing the command, such as SIGINT or SIGTERM.
+        /// </summary>
+        /// <param name="signal">The signal to send</param>
+        /// <exception cref="ArgumentException">Signal was not a valid CommandSignal.</exception>
+        /// <exception cref="SshConnectionException">The client is not connected.</exception>
+        /// <exception cref="SshOperationTimeoutException">The operation timed out.</exception>
+        /// <exception cref="InvalidOperationException">The size of the packet exceeds the maximum size defined by the protocol.</exception>
+        /// <exception cref="InvalidOperationException">Command has not been started.</exception>
+        public void SendSignal(CommandSignal signal)
+        {
+            var signalName = GetSignalName(signal);
+            if (signalName is null)
+            {
+                throw new ArgumentException("Signal was not a valid CommandSignal.");
+            }
+            if (_tcs is null || _tcs.Task.IsCompleted || _channel?.IsOpen != true)
+            {
+                throw new InvalidOperationException("Command has not been started.");
+            }
+
+            _ = _channel.SendSignalRequest(signalName);
+        }
+
         /// <summary>
         /// Executes the command specified by <see cref="CommandText"/>.
         /// </summary>

From 45794dc53d297a2cd3b405ecda8d43856311dff5 Mon Sep 17 00:00:00 2001
From: Levi Gillis <gillislevi@gmail.com>
Date: Fri, 3 Apr 2026 15:33:27 +0200
Subject: [PATCH 2/2] Fix formatting and warnigns

---
 src/Renci.SshNet/SshCommand.cs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Renci.SshNet/SshCommand.cs b/src/Renci.SshNet/SshCommand.cs
index 460e6c30e..48864c5b6 100644
--- a/src/Renci.SshNet/SshCommand.cs
+++ b/src/Renci.SshNet/SshCommand.cs
@@ -492,7 +492,7 @@ public void CancelAsync(bool forceKill = false, int millisecondsTimeout = 500)
         /// <summary>
         /// Tries to send a POSIX/ANSI signal to the remote process executing the command, such as SIGINT or SIGTERM.
         /// </summary>
-        /// <param name="signal">The signal to send</param>
+        /// <param name="signal">The signal to send.</param>
         /// <returns>If the signal was sent.</returns>
         public bool TrySendSignal(CommandSignal signal)
         {
@@ -524,7 +524,7 @@ public bool TrySendSignal(CommandSignal signal)
         /// <summary>
         /// Tries to send a POSIX/ANSI signal to the remote process executing the command, such as SIGINT or SIGTERM.
         /// </summary>
-        /// <param name="signal">The signal to send</param>
+        /// <param name="signal">The signal to send.</param>
         /// <exception cref="ArgumentException">Signal was not a valid CommandSignal.</exception>
         /// <exception cref="SshConnectionException">The client is not connected.</exception>
         /// <exception cref="SshOperationTimeoutException">The operation timed out.</exception>
@@ -537,6 +537,7 @@ public void SendSignal(CommandSignal signal)
             {
                 throw new ArgumentException("Signal was not a valid CommandSignal.");
             }
+
             if (_tcs is null || _tcs.Task.IsCompleted || _channel?.IsOpen != true)
             {
                 throw new InvalidOperationException("Command has not been started.");