Raise SIGINT when dying by ^C

Fixes sharkdp#854.

Cargo.toml

@@ -57,6 +57,7 @@ features = ["suggestions", "color", "wrap_help"]
 
 [target.'cfg(unix)'.dependencies]
 users = "0.11.0"
+nix = "0.23.0"
 
 [target.'cfg(all(unix, not(target_os = "redox")))'.dependencies]
 libc = "0.2"

src/exit_codes.rs

@@ -1,5 +1,8 @@
 use std::process;
 
+#[cfg(unix)]
+use nix::sys::signal::{SigHandler, Signal, raise, signal};
+
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum ExitCode {
     Success,
@@ -26,6 +29,19 @@ impl ExitCode {
 
     /// Exit the process with the appropriate code.
     pub fn exit(self) -> ! {
+        #[cfg(unix)]
+        match self {
+            ExitCode::KilledBySigint => {
+                // Get rid of the SIGINT handler, if present, and raise SIGINT
+                unsafe {
+                    if let Ok(_) = signal(Signal::SIGINT, SigHandler::SigDfl) {
+                        let _ = raise(Signal::SIGINT);
+                    }
+                }
+            }
+            _ => {},
+        }
+
         process::exit(self.into())
     }
 }