illumos header translation is wrong 02000000 should be 0x80000

[papertigers]

I am recently getting into rust and discovered that tokio wasn't working on illumos. I traced it back to mio but ultimately the issue ended up being this value in the libc crate. It looks like the octal value isn't properly translated to the rust crate as hex. Here's a test program I was using on linux and illumos:

extern crate libc;

#[allow(dead_code)]
const ILLUMOS_EPOLL_CLOEXEC: i32 = 0x80000;

fn find_func() -> usize {
    unsafe { libc::dlsym(libc::RTLD_DEFAULT, "epoll_create1\0".as_ptr() as *const _) as usize }
}

fn main() {
    let addr = find_func();

    #[allow(unused_variables)]
    let hex = format!("{:x}", addr);

    // I think the position changes per run on linux due to something like ASLR
    // so we only test on solaris for this use case
    #[cfg(target_os = "solaris")]
    assert_eq!(hex, "ffffbf7fff226fe0"); // confirmed with addrtosymstr

    unsafe {
        let f = std::mem::transmute::<usize, fn(i32) -> i32>(addr);

        #[cfg(target_os = "linux")]
        let epfd = f(libc::EPOLL_CLOEXEC);

        #[cfg(target_os = "solaris")]
        let epfd = f(ILLUMOS_EPOLL_CLOEXEC);

        println!("call to epoll_create1 returned: {}", epfd);
    }
}

Which outputs the following:

# cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.04s
     Running `target/debug/dlsym`
call to epoll_create1 returned: 3

Edit: typo

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (or someone else) soon.

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[alexcrichton]

@bors: r+

[bors]

📌 Commit 2341e6f has been approved by alexcrichton

[bors]

⌛ Testing commit 2341e6f with merge a9666f6...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: alexcrichton
Pushing a9666f6 to master...