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sys_util: Add conversion from errno io::Error.

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Change-Id: Ia49aa8eac1dedbc4e3f6277120bf332404e8b818
Reviewed-on: https://chromium-review.googlesource.com/509918
Commit-Ready: Dylan Reid <dgreid@chromium.org>
Tested-by: Dylan Reid <dgreid@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
This commit is contained in:
Zach Reizner 2017-05-19 15:42:36 -07:00 committed by chrome-bot
parent d6c579fcef
commit 37285dc09d
1 changed files with 9 additions and 2 deletions
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11
sys_util/src/errno.rs
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@ -3,11 +3,12 @@
// found in the LICENSE file. // found in the LICENSE file.
use std::result; use std::result;
use std::io;
use libc::__errno_location; use libc::__errno_location;
/// An error number, retrieved from [errno](http://man7.org/linux/man-pages/man3/errno.3.html), set /// An error number, retrieved from errno (man 3 errno), set by a libc
/// by a libc function that returned an error. /// function that returned an error.
#[derive(Clone, Copy, Debug, PartialEq)] #[derive(Clone, Copy, Debug, PartialEq)]
pub struct Error(i32); pub struct Error(i32);
pub type Result<T> = result::Result<T, Error>; pub type Result<T> = result::Result<T, Error>;
@ -32,6 +33,12 @@ impl Error {
} }
} }
impl From<io::Error> for Error {
fn from(e: io::Error) -> Self {
Error::new(e.raw_os_error().unwrap_or_default())
}
}
/// Returns the last errno as a Result that is always an error. /// Returns the last errno as a Result that is always an error.
pub fn errno_result<T>() -> Result<T> { pub fn errno_result<T>() -> Result<T> {
Err(Error::last()) Err(Error::last())