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use std::convert::TryFrom;
use std::io;
use std::sync::Once;
use crate::signal::registry::{globals, EventId, EventInfo, Init, Storage};
use crate::signal::RxFuture;
use winapi::shared::minwindef::{BOOL, DWORD, FALSE, TRUE};
use winapi::um::consoleapi::SetConsoleCtrlHandler;
use winapi::um::wincon::{CTRL_BREAK_EVENT, CTRL_C_EVENT};
pub(super) fn ctrl_c() -> io::Result<RxFuture> {
new(CTRL_C_EVENT)
}
pub(super) fn ctrl_break() -> io::Result<RxFuture> {
new(CTRL_BREAK_EVENT)
}
fn new(signum: DWORD) -> io::Result<RxFuture> {
global_init()?;
let rx = globals().register_listener(signum as EventId);
Ok(RxFuture::new(rx))
}
#[derive(Debug)]
pub(crate) struct OsStorage {
ctrl_c: EventInfo,
ctrl_break: EventInfo,
}
impl Init for OsStorage {
fn init() -> Self {
Self {
ctrl_c: EventInfo::default(),
ctrl_break: EventInfo::default(),
}
}
}
impl Storage for OsStorage {
fn event_info(&self, id: EventId) -> Option<&EventInfo> {
match DWORD::try_from(id) {
Ok(CTRL_C_EVENT) => Some(&self.ctrl_c),
Ok(CTRL_BREAK_EVENT) => Some(&self.ctrl_break),
_ => None,
}
}
fn for_each<'a, F>(&'a self, mut f: F)
where
F: FnMut(&'a EventInfo),
{
f(&self.ctrl_c);
f(&self.ctrl_break);
}
}
#[derive(Debug)]
pub(crate) struct OsExtraData {}
impl Init for OsExtraData {
fn init() -> Self {
Self {}
}
}
fn global_init() -> io::Result<()> {
static INIT: Once = Once::new();
let mut init = None;
INIT.call_once(|| unsafe {
let rc = SetConsoleCtrlHandler(Some(handler), TRUE);
let ret = if rc == 0 {
Err(io::Error::last_os_error())
} else {
Ok(())
};
init = Some(ret);
});
init.unwrap_or_else(|| Ok(()))
}
unsafe extern "system" fn handler(ty: DWORD) -> BOOL {
let globals = globals();
globals.record_event(ty as EventId);
// According to https://docs.microsoft.com/en-us/windows/console/handlerroutine
// the handler routine is always invoked in a new thread, thus we don't
// have the same restrictions as in Unix signal handlers, meaning we can
// go ahead and perform the broadcast here.
if globals.broadcast() {
TRUE
} else {
// No one is listening for this notification any more
// let the OS fire the next (possibly the default) handler.
FALSE
}
}
#[cfg(all(test, not(loom)))]
mod tests {
use super::*;
use crate::runtime::Runtime;
use tokio_test::{assert_ok, assert_pending, assert_ready_ok, task};
#[test]
fn ctrl_c() {
let rt = rt();
let _enter = rt.enter();
let mut ctrl_c = task::spawn(crate::signal::ctrl_c());
assert_pending!(ctrl_c.poll());
// Windows doesn't have a good programmatic way of sending events
// like sending signals on Unix, so we'll stub out the actual OS
// integration and test that our handling works.
unsafe {
super::handler(CTRL_C_EVENT);
}
assert_ready_ok!(ctrl_c.poll());
}
#[test]
fn ctrl_break() {
let rt = rt();
rt.block_on(async {
let mut ctrl_break = assert_ok!(crate::signal::windows::ctrl_break());
// Windows doesn't have a good programmatic way of sending events
// like sending signals on Unix, so we'll stub out the actual OS
// integration and test that our handling works.
unsafe {
super::handler(CTRL_BREAK_EVENT);
}
ctrl_break.recv().await.unwrap();
});
}
fn rt() -> Runtime {
crate::runtime::Builder::new_current_thread()
.build()
.unwrap()
}
}
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