From e9d2908765c3970f5d2d9e70eeb6459e47b372da Mon Sep 17 00:00:00 2001
From: Elias Rohrer <ero@tnull.de>
Date: Sun, 16 Oct 2022 08:23:29 +0200
Subject: [PATCH] Ignore Ctrl-C and enable Ctrl-D

We ignore Ctrl-C/SIGINT via a dummy signal handler and enable the use of
Ctrl-D. For convenience, we introduce "exit" and "quit" cli commands.
---
 Cargo.lock  |  1 +
 Cargo.toml  |  1 +
 src/cli.rs  | 11 ++++++++++-
 src/main.rs | 23 +++++++++++++++++++++++
 4 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index f85bf81..be79831 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -216,6 +216,7 @@ dependencies = [
  "chrono",
  "futures",
  "hex",
+ "libc",
  "lightning",
  "lightning-background-processor",
  "lightning-block-sync",
diff --git a/Cargo.toml b/Cargo.toml
index 0f20050..ea92890 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,6 +21,7 @@ bitcoin = "0.29.0"
 bitcoin-bech32 = "0.12"
 bech32 = "0.8"
 hex = "0.3"
+libc = "0.2"
 
 futures = "0.3"
 chrono = "0.4"
diff --git a/src/cli.rs b/src/cli.rs
index 7d86515..8dbba3d 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -147,7 +147,9 @@ pub(crate) async fn poll_for_user_input<E: EventHandler>(
 	inbound_payments: PaymentInfoStorage, outbound_payments: PaymentInfoStorage,
 	ldk_data_dir: String, network: Network,
 ) {
-	println!("LDK startup successful. To view available commands: \"help\".");
+	println!(
+		"LDK startup successful. Enter \"help\" to view available commands. Press Ctrl-D to quit."
+	);
 	println!("LDK logs are available at <your-supplied-ldk-data-dir-path>/.ldk/logs");
 	println!("Local Node ID is {}.", channel_manager.get_our_node_id());
 	loop {
@@ -158,6 +160,11 @@ pub(crate) async fn poll_for_user_input<E: EventHandler>(
 			break println!("ERROR: {e:#}");
 		}
 
+		if line.len() == 0 {
+			// We hit EOF / Ctrl-D
+			break;
+		}
+
 		let mut words = line.split_whitespace();
 		if let Some(word) = words.next() {
 			match word {
@@ -459,6 +466,7 @@ pub(crate) async fn poll_for_user_input<E: EventHandler>(
 						Err(e) => println!("ERROR: failed to send onion message: {:?}", e),
 					}
 				}
+				"quit" | "exit" => break,
 				_ => println!("Unknown command. See `\"help\" for available commands."),
 			}
 		}
@@ -479,6 +487,7 @@ fn help() {
 	println!("listpeers");
 	println!("signmessage <message>");
 	println!("sendonionmessage <node_id_1,node_id_2,..,destination_node_id>");
+	println!("quit")
 }
 
 fn node_info(channel_manager: &Arc<ChannelManager>, peer_manager: &Arc<PeerManager>) {
diff --git a/src/main.rs b/src/main.rs
index 6cff9f1..f3d888b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -775,5 +775,28 @@ async fn start_ldk() {
 
 #[tokio::main]
 pub async fn main() {
+	#[cfg(not(target_os = "windows"))]
+	{
+		// Catch Ctrl-C with a dummy signal handler.
+		unsafe {
+			let mut new_action: libc::sigaction = core::mem::zeroed();
+			let mut old_action: libc::sigaction = core::mem::zeroed();
+
+			extern "C" fn dummy_handler(
+				_: libc::c_int, _: *const libc::siginfo_t, _: *const libc::c_void,
+			) {
+			}
+
+			new_action.sa_sigaction = dummy_handler as libc::sighandler_t;
+			new_action.sa_flags = libc::SA_SIGINFO;
+
+			libc::sigaction(
+				libc::SIGINT,
+				&new_action as *const libc::sigaction,
+				&mut old_action as *mut libc::sigaction,
+			);
+		}
+	}
+
 	start_ldk().await;
 }
-- 
2.30.2