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#[cfg(unix)] extern crate libc;
#[cfg(windows)] extern crate winapi;
#[cfg(windows)] extern crate kernel32;
#[cfg(unix)] mod unix;
#[cfg(unix)] mod sys { pub use unix::*; }
#[cfg(windows)] mod windows;
#[cfg(windows)] mod sys { pub use windows::*; }
use std::fmt;
#[derive(Copy, Clone, Eq, Ord, PartialEq, PartialOrd, Hash)]
pub struct Errno(pub i32);
impl fmt::Debug for Errno {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
sys::with_description(*self, |desc| {
fmt.debug_struct("Errno")
.field("code", &self.0)
.field("description", &desc.ok())
.finish()
})
}
}
impl fmt::Display for Errno {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
sys::with_description(*self, |desc| match desc {
Ok(desc) => fmt.write_str(&desc),
Err(fm_err) => write!(
fmt, "OS error {} ({} returned error {})",
self.0, sys::STRERROR_NAME, fm_err.0),
})
}
}
pub fn errno() -> Errno {
sys::errno()
}
pub fn set_errno(err: Errno) {
sys::set_errno(err)
}
#[test]
fn it_works() {
let x = errno();
set_errno(x);
let _ = x.to_string();
}
#[test]
fn check_description() {
let expect = if cfg!(windows) {
"Incorrect function."
} else {
"Operation not permitted"
};
set_errno(Errno(1));
assert_eq!(errno().to_string(), expect);
assert_eq!(
format!("{:?}", errno()),
format!("Errno {{ code: 1, description: Some({:?}) }}", expect));
}