1 files changed, 57 insertions, 0 deletions
diff --git a/ARMeilleure/Signal/UnixSignalHandlerRegistration.cs b/ARMeilleure/Signal/UnixSignalHandlerRegistration.cs
new file mode 100644
index 00000000..9e87749e
--- /dev/null
+++ b/ARMeilleure/Signal/UnixSignalHandlerRegistration.cs
@@ -0,0 +1,57 @@
+using Mono.Unix.Native;
+using System;
+using System.Runtime.InteropServices;
+
+namespace ARMeilleure.Signal
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    unsafe struct SigSet
+    {
+        fixed long sa_mask[16];
+    }
+
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    struct SigAction
+    {
+        public IntPtr sa_handler;
+        public SigSet sa_mask;
+        public int sa_flags;
+        public IntPtr sa_restorer;
+    }
+
+    static class UnixSignalHandlerRegistration
+    {
+        private const int SA_SIGINFO = 0x00000004;
+
+        [DllImport("libc", SetLastError = true)]
+        private static extern int sigaction(int signum, ref SigAction sigAction, out SigAction oldAction);
+
+        [DllImport("libc", SetLastError = true)]
+        private static extern int sigemptyset(ref SigSet set);
+
+        public static SigAction RegisterExceptionHandler(IntPtr action)
+        {
+            SigAction sig = new SigAction
+            {
+                sa_handler = action,
+                sa_flags = SA_SIGINFO
+            };
+
+            sigemptyset(ref sig.sa_mask);
+
+            int result = sigaction((int)Signum.SIGSEGV, ref sig, out SigAction old);
+
+            if (result != 0)
+            {
+                throw new InvalidOperationException($"Could not register sigaction. Error: {result}");
+            }
+
+            return old;
+        }
+
+        public static bool RestoreExceptionHandler(SigAction oldAction)
+        {
+            return sigaction((int)Signum.SIGSEGV, ref oldAction, out SigAction _) == 0;
+        }
+    }
+}