kernel_explainer/
signals.rs

1// Signal number → name and description for kill panel.
2pub fn signal_description(num: i32) -> String {
3    match num {
4        15 => {
5            "SIGTERM (15): ask the process to exit cleanly; can be caught or handled.".to_string()
6        }
7        9 => "SIGKILL (9): forcefully kill the process; cannot be caught, blocked, or ignored."
8            .to_string(),
9        2 => "SIGINT (2): interrupt from keyboard (Ctrl-C); default is to terminate.".to_string(),
10        3 => "SIGQUIT (3): quit from keyboard; usually terminates and produces a core dump."
11            .to_string(),
12        1 => "SIGHUP (1): hangup; often used by daemons to reload configuration.".to_string(),
13        19 => "SIGSTOP (19): stop (pause) the process; cannot be caught or ignored.".to_string(),
14        18 => "SIGCONT (18): resume a process previously stopped with SIGSTOP/SIGTSTP.".to_string(),
15        10 => {
16            "SIGUSR1 (10): user-defined signal 1; semantics are application-specific.".to_string()
17        }
18        12 => {
19            "SIGUSR2 (12): user-defined signal 2; semantics are application-specific.".to_string()
20        }
21        other => format!("Signal {}: see `kill -l` for details.", other),
22    }
23}
24
25#[cfg(test)]
26mod tests {
27    use super::signal_description;
28
29    #[test]
30    fn describes_common_signals() {
31        let term = signal_description(15);
32        assert!(term.contains("SIGTERM"));
33
34        let kill = signal_description(9);
35        assert!(kill.contains("SIGKILL"));
36    }
37
38    #[test]
39    fn describes_unknown_signal_generically() {
40        let s = signal_description(99);
41        assert!(s.contains("Signal 99"));
42    }
43}
kernel_explainer/signals.rs

kernel_explainer/
signals.rs
