all: refactor to cargo workspace, remove config shared library, remove protocol perms, add dpms cli (#7)

crates/sighand/src/lib.rs

@@ -0,0 +1,63 @@
+use {
+    jay_async_engine::{AsyncEngine, SpawnedFuture},
+    jay_io_uring::IoUring,
+    jay_utils::{
+        buf::TypedBuf,
+        errorfmt::ErrorFmt,
+        oserror::{OsError, OsErrorExt2},
+    },
+    std::rc::Rc,
+    thiserror::Error,
+    uapi::{OwnedFd, c},
+};
+
+#[derive(Debug, Error)]
+pub enum SighandError {
+    #[error("Could not block the signalfd signals")]
+    BlockFailed(#[source] OsError),
+    #[error("Could not create a signalfd")]
+    CreateFailed(#[source] OsError),
+}
+
+pub fn install(
+    eng: &Rc<AsyncEngine>,
+    ring: &Rc<IoUring>,
+) -> Result<SpawnedFuture<()>, SighandError> {
+    let mut set: c::sigset_t = uapi::pod_zeroed();
+    uapi::sigaddset(&mut set, c::SIGINT).unwrap();
+    uapi::sigaddset(&mut set, c::SIGTERM).unwrap();
+    uapi::sigaddset(&mut set, c::SIGPIPE).unwrap();
+    uapi::pthread_sigmask(c::SIG_BLOCK, Some(&set), None).map_os_err(SighandError::BlockFailed)?;
+    let fd = uapi::signalfd_new(&set, c::SFD_CLOEXEC)
+        .map(Rc::new)
+        .map_os_err(SighandError::CreateFailed)?;
+    Ok(eng.spawn("signal handler", handle_signals(fd, ring.clone())))
+}
+
+async fn handle_signals(fd: Rc<OwnedFd>, ring: Rc<IoUring>) {
+    let mut buf = TypedBuf::<c::signalfd_siginfo>::new();
+    loop {
+        if let Err(e) = ring.read(&fd, buf.buf()).await {
+            log::error!("Could not read from signal fd: {}", ErrorFmt(e));
+            return;
+        }
+        let sig = buf.t().ssi_signo as i32;
+        log::info!("Received signal {}", sig);
+        if matches!(sig, c::SIGINT | c::SIGTERM) {
+            log::info!("Exiting");
+            ring.stop();
+        }
+    }
+}
+
+pub fn reset_all() {
+    const NSIG: c::c_int = 64;
+    unsafe {
+        for sig in 1..=NSIG {
+            c::signal(sig, c::SIG_DFL);
+        }
+    }
+    let mut set: c::sigset_t = uapi::pod_zeroed();
+    uapi::sigfillset(&mut set).unwrap();
+    let _ = uapi::pthread_sigmask(c::SIG_UNBLOCK, Some(&set), None);
+}