libudev/
error.rs

1use std::ffi::CStr;
2use std::fmt;
3use std::io;
4use std::str;
5
6use std::error::Error as StdError;
7use std::result::Result as StdResult;
8
9use libc::c_int;
10
11/// A `Result` type for libudev operations.
12pub type Result<T> = StdResult<T,Error>;
13
14/// Types of errors that occur in libudev.
15#[derive(Debug,Clone,Copy,PartialEq,Eq)]
16pub enum ErrorKind {
17    NoMem,
18    InvalidInput,
19    Io(io::ErrorKind),
20}
21
22/// The error type for libudev operations.
23#[derive(Debug)]
24pub struct Error {
25    errno: c_int,
26}
27
28impl Error {
29    fn strerror(&self) -> &str {
30        unsafe {
31            str::from_utf8_unchecked(CStr::from_ptr(::libc::strerror(self.errno)).to_bytes())
32        }
33    }
34
35    /// Returns the corresponding `ErrorKind` for this error.
36    pub fn kind(&self) -> ErrorKind {
37        match self.errno {
38            ::libc::ENOMEM => ErrorKind::NoMem,
39            ::libc::EINVAL => ErrorKind::InvalidInput,
40            errno => ErrorKind::Io(io::Error::from_raw_os_error(errno).kind()),
41        }
42    }
43
44    /// Returns a description of the error.
45    pub fn description(&self) -> &str {
46        self.strerror()
47    }
48}
49
50impl fmt::Display for Error {
51    fn fmt(&self, fmt: &mut fmt::Formatter) -> StdResult<(),fmt::Error> {
52        fmt.write_str(self.strerror())
53    }
54}
55
56impl StdError for Error {
57    fn description(&self) -> &str {
58        self.strerror()
59    }
60}
61
62impl From<Error> for io::Error {
63    fn from(error: Error) -> io::Error {
64        let io_error_kind = match error.kind() {
65            ErrorKind::Io(kind) => kind,
66            ErrorKind::InvalidInput => io::ErrorKind::InvalidInput,
67            ErrorKind::NoMem => io::ErrorKind::Other,
68        };
69
70        io::Error::new(io_error_kind, error.strerror())
71    }
72}
73
74pub fn from_errno(errno: c_int) -> Error {
75    Error { errno: -errno }
76}
libudev/error.rs

libudev/
error.rs
