Don't leak blocks if GetCheckedHandle throws.

src/Network/NWConnection.cs

@@ -109,8 +109,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_stateChangeHandler, stateHandler);
 
-				nw_connection_set_state_changed_handler (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_connection_set_state_changed_handler (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -141,8 +144,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_BooleanChangeHandler, callback);
 
-				nw_connection_set_viability_changed_handler (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_connection_set_viability_changed_handler (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -162,8 +168,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_BooleanChangeHandler, callback);
 
-				nw_connection_set_better_path_available_handler (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_connection_set_better_path_available_handler (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -191,8 +200,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_PathChanged, callback);
 
-				nw_connection_set_path_changed_handler (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_connection_set_path_changed_handler (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -302,8 +314,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_ReceiveCompletion, callback);
 
-				nw_connection_receive (GetCheckedHandle (), minimumIncompleteLength, maximumLength, (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_connection_receive (GetCheckedHandle (), minimumIncompleteLength, maximumLength, (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -318,8 +333,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_ReceiveCompletionDispatchData, callback);
 
-				nw_connection_receive (GetCheckedHandle (), minimumIncompleteLength, maximumLength, (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_connection_receive (GetCheckedHandle (), minimumIncompleteLength, maximumLength, (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -337,8 +355,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_ReceiveCompletion, callback);
 
-				nw_connection_receive_message (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_connection_receive_message (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -353,8 +374,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_ReceiveCompletionDispatchData, callback);
 
-				nw_connection_receive_message (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_connection_receive_message (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -424,8 +448,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_SendCompletion, callback);
 
-				LowLevelSend (GetCheckedHandle (), buffer, context.Handle, isComplete, block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					LowLevelSend (GetCheckedHandle (), buffer, context.Handle, isComplete, block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 

src/Network/NWContentContext.cs

@@ -182,8 +182,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_ProtocolIterator, callback);
 
-				nw_content_context_foreach_protocol_metadata (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_content_context_foreach_protocol_metadata (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 

src/Network/NWListener.cs

@@ -133,8 +133,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_ListenerStateChanged, callback);
 
-				nw_listener_set_state_changed_handler (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_listener_set_state_changed_handler (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -167,8 +170,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_NewConnection, callback);
 
-				nw_listener_set_new_connection_handler (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_listener_set_new_connection_handler (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -204,8 +210,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_AdvertisedEndpointChangedHandler, callback);
 
-				nw_listener_set_advertised_endpoint_changed_handler (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_listener_set_advertised_endpoint_changed_handler (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 

src/Network/NWParameters.cs

@@ -377,8 +377,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_iterateProhibitedHandler, iterationCallback);
 
-				nw_parameters_iterate_prohibited_interfaces (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_parameters_iterate_prohibited_interfaces (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 
@@ -408,8 +411,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_IterateProhibitedTypeHandler, callback);
 
-				nw_parameters_iterate_prohibited_interface_types (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_parameters_iterate_prohibited_interface_types (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 

src/Network/NWPath.cs

@@ -121,8 +121,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_Enumerator, callback);
 
-				nw_path_enumerate_interfaces (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_path_enumerate_interfaces (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}
 	}

src/Network/NWProtocolStack.cs

@@ -71,8 +71,11 @@ namespace Network {
 				BlockLiteral *block_ptr_handler = &block_handler;
 				block_handler.SetupBlockUnsafe (static_iterateHandler, callback);
 
-				nw_protocol_stack_iterate_application_protocols (GetCheckedHandle (), (void*) block_ptr_handler);
-				block_handler.CleanupBlock ();
+				try {
+					nw_protocol_stack_iterate_application_protocols (GetCheckedHandle (), (void*) block_ptr_handler);
+				} finally {
+					block_handler.CleanupBlock ();
+				}
 			}
 		}