I'm trying to listen to signals between libc::SIGRTMIN() and libc::SIGRTMAX() with tokio, but it fails with "signal too large".
However, I was able to listen to these signals with the signal-hook crate.
I tracked the error down with gdb, and the reason it fails, is because of this check in tokio/src/signal/unix.rs:
fn signal_enable(signal: SignalKind, handle: &Handle) -> io::Result<()> {
// ...
let globals = globals();
let siginfo = match globals.storage().get(signal as EventId) {
Some(slot) => slot,
None => return Err(io::Error::new(io::ErrorKind::Other, "signal too large")),
};
// ...
}
Why is this check there, and why don't the globals contain the signals between SIGRTMIN and SIGRTMAX?
Also, what do I do now that it doesn't work?
Here's the code to reproduce the error:
use tokio::signal::unix::{signal, SignalKind};
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let signal = signal(SignalKind::from_raw(libc::SIGRTMIN()))?;
Ok(())
}
