96 lines
2.4 KiB
Rust
96 lines
2.4 KiB
Rust
use std::sync::Mutex;
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lazy_static! {
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static ref CLEANUP: Mutex<Option<Box<Fn(self::Signal) + Send>>> = Mutex::new(None);
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}
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pub enum Signal {
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Terminate,
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Stop,
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Continue
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}
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#[cfg(unix)]
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pub fn install_handler<F>(handler: F)
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where F: Fn(self::Signal) + 'static + Send + Sync
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{
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use std::thread;
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use nix::sys::signal::*;
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// Mask all signals interesting to us. The mask propagates
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// to all threads started after this point.
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let mut mask = SigSet::empty();
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mask.add(SIGTERM);
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mask.add(SIGINT);
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mask.add(SIGTSTP);
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mask.add(SIGCONT);
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mask.thread_set_mask().expect("unable to set signal mask");
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set_handler(handler);
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// Spawn a thread to catch these signals
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thread::spawn(move || {
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loop {
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let raw_signal = mask.wait().expect("unable to sigwait");
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let sig = match raw_signal {
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SIGTERM => self::Signal::Terminate,
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SIGINT => self::Signal::Terminate,
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SIGTSTP => self::Signal::Stop,
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SIGCONT => self::Signal::Continue,
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_ => unreachable!()
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};
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// Invoke closure
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invoke(sig);
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// Restore default behavior for received signal and unmask it
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let default_action = SigAction::new(SigHandler::SigDfl, SaFlags::empty(), SigSet::empty());
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unsafe {
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let _ = sigaction(raw_signal, &default_action);
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}
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let mut new_mask = SigSet::empty();
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new_mask.add(raw_signal);
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// Re-raise with signal unmasked
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let _ = new_mask.thread_unblock();
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let _ = raise(raw_signal);
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let _ = new_mask.thread_block();
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}
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});
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}
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#[cfg(windows)]
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pub fn install_handler<F>(handler: F)
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where F: Fn(self::Signal) + 'static + Send + Sync
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{
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use kernel32::SetConsoleCtrlHandler;
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use winapi::{BOOL, DWORD, FALSE, TRUE};
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pub unsafe extern "system" fn ctrl_handler(_: DWORD) -> BOOL {
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invoke(self::Signal::Terminate);
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FALSE
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}
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set_handler(handler);
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unsafe {
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SetConsoleCtrlHandler(Some(ctrl_handler), TRUE);
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}
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}
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fn invoke(sig: self::Signal) {
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if let Some(ref handler) = *CLEANUP.lock().unwrap() {
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handler(sig)
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}
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}
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fn set_handler<F>(handler: F)
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where F: Fn(self::Signal) + 'static + Send + Sync
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{
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*CLEANUP.lock().unwrap() = Some(Box::new(handler));
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}
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