add set_signal_chaining flag

clr_loader/__init__.py

@@ -32,6 +32,7 @@ def get_mono(
     jit_options: Optional[Sequence[str]] = None,
     assembly_dir: Optional[str] = None,
     config_dir: Optional[str] = None,
+    set_signal_chaining: bool = False
 ) -> Runtime:
     """Get a Mono runtime instance
 
@@ -54,6 +55,16 @@ def get_mono(
         The base directory for assemblies, passed to ``mono_set_dirs``
     :param config_dir:
         The base directory for configuration files, passed to ``mono_set_dirs``
+    :param set_signal_chaining:
+        Whether to enable signal chaining, passed to ``mono_set_signal_chaining``.
+        If it is enabled, the runtime saves the original signal handlers before
+        installing its own, and calls the original ones in the following cases:
+            - SIGSEGV/SIGABRT while executing native code
+            - SIGPROF
+            - SIGFPE
+            - SIGQUIT
+            - SIGUSR2
+        This currently only works on POSIX platforms
     """
     from .mono import Mono
 
@@ -70,6 +81,7 @@ def get_mono(
         libmono=libmono,
         assembly_dir=assembly_dir,
         config_dir=config_dir,
+        set_signal_chaining=set_signal_chaining,
     )
     return impl
 

clr_loader/ffi/mono.py

@@ -41,5 +41,8 @@
 void* mono_object_unbox(MonoObject *object);
 
 void mono_set_dirs(const char *assembly_dir, const char* config_dir);
+
+void mono_set_signal_chaining(bool chain_signals);
+
 """
 )

clr_loader/mono.py

@@ -26,6 +26,7 @@ def __init__(
         global_config_file: Optional[Path] = None,
         assembly_dir: Optional[str] = None,
         config_dir: Optional[str] = None,
+        set_signal_chaining: bool = False,
     ):
         self._assemblies: Dict[Path, Any] = {}
 
@@ -37,6 +38,7 @@ def __init__(
             libmono=libmono,
             assembly_dir=assembly_dir,
             config_dir=config_dir,
+            set_signal_chaining=set_signal_chaining,
         )
 
         if domain is None:
@@ -126,7 +128,8 @@ def initialize(
     config_file: Optional[str] = None,
     global_config_file: Optional[str] = None,
     assembly_dir: Optional[str] = None,
-    config_dir: Optional[str] = None
+    config_dir: Optional[str] = None,
+    set_signal_chaining: bool = False,
 ) -> str:
     global _MONO, _ROOT_DOMAIN
     if _MONO is None:
@@ -152,6 +155,9 @@ def initialize(
         else:
             options = []
 
+        if set_signal_chaining:
+            _MONO.mono_set_signal_chaining(True)
+
         if debug:
             _MONO.mono_debug_init(_MONO.MONO_DEBUG_FORMAT_MONO)