How to detect `submit_with_args` timeout?

[pauldoo]

Hello,
When using submit_with_args and a timeout parameter, example like this:

let submitter: Submitter<'_> = ???;

let args = SubmitArgs::new().timespec(&(std::time::Duration::from_millis(100).into()));
let result = submitter.submit_with_args(1, &args);

What is the recommended approach for the application to determine that the timer expired?

What I observe is that the result comes back as Err(io::Error), with the "ErrorKind" set to "Uncategorized" (this variant is hidden from the docs). I can see the ETIME (62) result if I display the error as it shows Timer expired (os error 62). Clearly I don't want to be parsing the formatted error message, so I'm hoping you know a better way to check for expiry.

I could use io::Error::raw_os_error, but the type it returns is available only in nightly.

[pauldoo]

I could use io::Error::raw_os_error, but the type it returns is available only in nightly.

Okay, turns out this is absolutely fine even without nightly. Only the RawOsError type is marked nightly. There's nothing to stop me from doing:

if let Err(e) = &submit_result
    && e.raw_os_error() == Some(libc::ETIME)
{
    // handle timeout
}