std::io::ErrorKind - Rust
Description: API documentation for the Rust `ErrorKind` enum in crate `std`.
Keywords: rust, rustlang, rust-lang, ErrorKind

# 1.0.0[−][src]Enum std::io::ErrorKind

    #[non_exhaustive]
    pub enum ErrorKind {
        NotFound,
        PermissionDenied,
        ConnectionRefused,
        ConnectionReset,
        ConnectionAborted,
        NotConnected,
        AddrInUse,
        AddrNotAvailable,
        BrokenPipe,
        AlreadyExists,
        WouldBlock,
        InvalidInput,
        InvalidData,
        TimedOut,
        WriteZero,
        Interrupted,
        Other,
        UnexpectedEof,
    }

A list specifying general categories of I/O error.

This list is intended to grow over time and it is not recommended to exhaustively match against it.

It is used with the `io::Error` type.

## Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
`NotFound`

An entity was not found, often a file.

`PermissionDenied`

The operation lacked the necessary privileges to complete.

`ConnectionRefused`

The connection was refused by the remote server.

`ConnectionReset`

The connection was reset by the remote server.

`ConnectionAborted`

The connection was aborted (terminated) by the remote server.

`NotConnected`

The network operation failed because it was not connected yet.

`AddrInUse`

A socket address could not be bound because the address is already in use elsewhere.

`AddrNotAvailable`

A nonexistent interface was requested or the requested address was not local.

`BrokenPipe`

The operation failed because a pipe was closed.

`AlreadyExists`

An entity already exists, often a file.

`WouldBlock`

The operation needs to block to complete, but the blocking operation was requested to not occur.

`InvalidInput`

A parameter was incorrect.

`InvalidData`

Data not valid for the operation were encountered.

Unlike `InvalidInput`, this typically means that the operation parameters were valid, however the error was caused by malformed input data.

For example, a function that reads a file into a string will error with `InvalidData` if the file's contents are not valid UTF-8.

1.2.0
`TimedOut`

The I/O operation's timeout expired, causing it to be canceled.

`WriteZero`

An error returned when an operation could not be completed because a call to `write` returned `Ok(0)`.

This typically means that an operation could only succeed if it wrote a particular number of bytes but only a smaller number of bytes could be written.

`Interrupted`

This operation was interrupted.

Interrupted operations can typically be retried.

`Other`

Any I/O error not part of this list.

`UnexpectedEof`

An error returned when an operation could not be completed because an "end of file" was reached prematurely.

This typically means that an operation could only succeed if it read a particular number of bytes but only a smaller number of bytes could be read.

1.6.0

## Trait Implementations

###

`impl PartialEq<ErrorKind> for ErrorKind`

[src]

####

`fn eq(&self, other: &ErrorKind) -> bool`

[src]

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

####

`#[must_use] fn ne(&self, other: &Rhs) -> bool`

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This method tests for `!=`.

###

`impl Eq for ErrorKind`

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###

`impl Ord for ErrorKind`

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####

`fn cmp(&self, other: &ErrorKind) -> Ordering`

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This method returns an `Ordering` between `self` and `other`. Read more

####

`fn max(self, other: Self) -> Self`

1.21.0
[src]

Compares and returns the maximum of two values. Read more

####

`fn min(self, other: Self) -> Self`

1.21.0
[src]

Compares and returns the minimum of two values. Read more

###

`impl PartialOrd<ErrorKind> for ErrorKind`

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####

`fn partial_cmp(&self, other: &ErrorKind) -> Option<Ordering>`

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This method returns an ordering between `self` and `other` values if one exists. Read more

####

`#[must_use] fn lt(&self, other: &Rhs) -> bool`

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This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

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`#[must_use] fn le(&self, other: &Rhs) -> bool`

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This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

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`#[must_use] fn gt(&self, other: &Rhs) -> bool`

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This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

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`#[must_use] fn ge(&self, other: &Rhs) -> bool`

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This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

###

`impl Debug for ErrorKind`

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####

`fn fmt(&self, f: &mut Formatter) -> Result`

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Formats the value using the given formatter. Read more

###

`impl Hash for ErrorKind`

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####

`fn hash<__H: Hasher>(&self, state: &mut __H)`

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Feeds this value into the given [`Hasher`]. Read more

####

`fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher,`

1.3.0
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Feeds a slice of this type into the given [`Hasher`]. Read more

###

`impl Copy for ErrorKind`

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###

`impl From<ErrorKind> for Error`

1.14.0
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Intended for use for errors not exposed to the user, where allocating onto the heap (for normal construction via Error::new) is too costly.

####

`fn from(kind: ErrorKind) -> Error`

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Performs the conversion.

###

`impl Clone for ErrorKind`

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####

`fn clone(&self) -> ErrorKind`

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Returns a copy of the value. Read more

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`fn clone_from(&mut self, source: &Self)`

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Performs copy-assignment from `source`. Read more

## Auto Trait Implementations

###

`impl Send for ErrorKind`

###

`impl Sync for ErrorKind`

## Blanket Implementations

###

`impl<T, U> TryFrom for T where T: From<U>,`

[src]

#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

####

`fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`

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🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

###

`impl<T> From for T`

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####

`fn from(t: T) -> T`

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Performs the conversion.

###

`impl<T, U> TryInto for T where U: TryFrom<T>,`

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#### `type Error = <U as TryFrom<T>>::Error`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

####

`fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`

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🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

###

`impl<T, U> Into for T where U: From<T>,`

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####

`fn into(self) -> U`

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Performs the conversion.

###

`impl<T> Borrow for T where T: ?Sized,`

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####
ⓘImportant traits for &'a mut I

### Important traits for &'a mut I

`impl<'a, I> Iterator for &'a mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`

`fn borrow(&self) -> &T`

[src]

Immutably borrows from an owned value. Read more

###

`impl<T> BorrowMut for T where T: ?Sized,`

[src]

####
ⓘImportant traits for &'a mut I

### Important traits for &'a mut I

`impl<'a, I> Iterator for &'a mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`

`fn borrow_mut(&mut self) -> &mut T`

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Mutably borrows from an owned value. Read more

###

`impl<T> Any for T where T: 'static + ?Sized,`

[src]

####

`fn get_type_id(&self) -> TypeId`

[src]

🔬 This is a nightly-only experimental API. (`get_type_id` #27745)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

###

`impl<T> ToOwned for T where T: Clone,`

[src]

#### `type Owned = T`

####

`fn to_owned(&self) -> T`

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Creates owned data from borrowed data, usually by cloning. Read more

####

`fn clone_into(&self, target: &mut T)`

[src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

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