pub struct OpenFlags(/* private fields */);
Expand description

指定文件打开时的权限

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impl OpenFlags

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pub const RDONLY: OpenFlags = _

只读

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pub const WRONLY: OpenFlags = _

只能写入

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pub const RDWR: OpenFlags = _

读写

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pub const CREATE: OpenFlags = _

如文件不存在,可创建它

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pub const EXCLUSIVE: OpenFlags = _

确认一定是创建文件。如文件已存在,返回 EEXIST。

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pub const NOCTTY: OpenFlags = _

使打开的文件不会成为该进程的控制终端。目前没有终端设置,不处理

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pub const EXCL: OpenFlags = _

同上,在不同的库中可能会用到这个或者上一个

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pub const NON_BLOCK: OpenFlags = _

非阻塞读写?(虽然不知道为什么但 date.lua 也要) 在 socket 中使用得较多

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pub const TEXT: OpenFlags = _

要求把 CR-LF 都换成 LF

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pub const BINARY: OpenFlags = _

和上面不同,要求输入输出都不进行这个翻译

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pub const DSYNC: OpenFlags = _

对这个文件的输出需符合 IO 同步一致性。可以理解为随时 fsync

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pub const NOFOLLOW: OpenFlags = _

如果是符号链接,不跟随符号链接去寻找文件,而是针对连接本身

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pub const CLOEXEC: OpenFlags = _

在 exec 时需关闭

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pub const DIR: OpenFlags = _

是否是目录

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impl OpenFlags

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pub const fn empty() -> OpenFlags

Get a flags value with all bits unset.

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pub const fn all() -> OpenFlags

Get a flags value with all known bits set.

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pub const fn bits(&self) -> u32

Get the underlying bits value.

The returned value is exactly the bits set in this flags value.

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pub const fn from_bits(bits: u32) -> Option<OpenFlags>

Convert from a bits value.

This method will return None if any unknown bits are set.

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pub const fn from_bits_truncate(bits: u32) -> OpenFlags

Convert from a bits value, unsetting any unknown bits.

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pub const fn from_bits_retain(bits: u32) -> OpenFlags

Convert from a bits value exactly.

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pub fn from_name(name: &str) -> Option<OpenFlags>

Get a flags value with the bits of a flag with the given name set.

This method will return None if name is empty or doesn’t correspond to any named flag.

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pub const fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

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pub const fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

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pub const fn intersects(&self, other: OpenFlags) -> bool

Whether any set bits in a source flags value are also set in a target flags value.

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pub const fn contains(&self, other: OpenFlags) -> bool

Whether all set bits in a source flags value are also set in a target flags value.

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pub fn insert(&mut self, other: OpenFlags)

The bitwise or (|) of the bits in two flags values.

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pub fn remove(&mut self, other: OpenFlags)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. remove won’t truncate other, but the ! operator will.

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pub fn toggle(&mut self, other: OpenFlags)

The bitwise exclusive-or (^) of the bits in two flags values.

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pub fn set(&mut self, other: OpenFlags, value: bool)

Call insert when value is true or remove when value is false.

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pub const fn intersection(self, other: OpenFlags) -> OpenFlags

The bitwise and (&) of the bits in two flags values.

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pub const fn union(self, other: OpenFlags) -> OpenFlags

The bitwise or (|) of the bits in two flags values.

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pub const fn difference(self, other: OpenFlags) -> OpenFlags

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

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pub const fn symmetric_difference(self, other: OpenFlags) -> OpenFlags

The bitwise exclusive-or (^) of the bits in two flags values.

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pub const fn complement(self) -> OpenFlags

The bitwise negation (!) of the bits in a flags value, truncating the result.

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impl OpenFlags

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pub const fn iter(&self) -> Iter<OpenFlags>

Yield a set of contained flags values.

Each yielded flags value will correspond to a defined named flag. Any unknown bits will be yielded together as a final flags value.

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pub const fn iter_names(&self) -> IterNames<OpenFlags>

Yield a set of contained named flags values.

This method is like iter, except only yields bits in contained named flags. Any unknown bits, or bits not corresponding to a contained flag will not be yielded.

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impl OpenFlags

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pub fn read_write(&self) -> (bool, bool)

获得文件的读/写权限

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pub fn readable(&self) -> bool

获取读权限

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pub fn writable(&self) -> bool

获取写权限

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pub fn creatable(&self) -> bool

获取创建权限

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pub fn new_creatable(&self) -> bool

获取创建新文件权限 与上面的区别是,如果文件已存在,返回 EEXIST

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pub fn is_dir(&self) -> bool

获取是否是目录

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pub fn is_close_on_exec(&self) -> bool

获取是否需要在 exec() 时关闭

Trait Implementations§

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impl Binary for OpenFlags

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.
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impl BitAnd for OpenFlags

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fn bitand(self, other: OpenFlags) -> OpenFlags

The bitwise and (&) of the bits in two flags values.

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type Output = OpenFlags

The resulting type after applying the & operator.
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impl BitAndAssign for OpenFlags

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fn bitand_assign(&mut self, other: OpenFlags)

The bitwise and (&) of the bits in two flags values.

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impl BitOr for OpenFlags

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fn bitor(self, other: OpenFlags) -> OpenFlags

The bitwise or (|) of the bits in two flags values.

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type Output = OpenFlags

The resulting type after applying the | operator.
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impl BitOrAssign for OpenFlags

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fn bitor_assign(&mut self, other: OpenFlags)

The bitwise or (|) of the bits in two flags values.

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impl BitXor for OpenFlags

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fn bitxor(self, other: OpenFlags) -> OpenFlags

The bitwise exclusive-or (^) of the bits in two flags values.

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type Output = OpenFlags

The resulting type after applying the ^ operator.
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impl BitXorAssign for OpenFlags

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fn bitxor_assign(&mut self, other: OpenFlags)

The bitwise exclusive-or (^) of the bits in two flags values.

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impl Clone for OpenFlags

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fn clone(&self) -> OpenFlags

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for OpenFlags

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Default for OpenFlags

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fn default() -> OpenFlags

Returns the “default value” for a type. Read more
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impl Extend<OpenFlags> for OpenFlags

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fn extend<T>(&mut self, iterator: T)
where T: IntoIterator<Item = OpenFlags>,

The bitwise or (|) of the bits in each flags value.

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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more
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impl Flags for OpenFlags

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const FLAGS: &'static [Flag<OpenFlags>] = _

The set of defined flags.
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type Bits = u32

The underlying bits type.
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fn bits(&self) -> u32

Get the underlying bits value. Read more
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fn from_bits_retain(bits: u32) -> OpenFlags

Convert from a bits value exactly.
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fn empty() -> Self

Get a flags value with all bits unset.
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fn all() -> Self

Get a flags value with all known bits set.
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fn from_bits(bits: Self::Bits) -> Option<Self>

Convert from a bits value. Read more
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fn from_bits_truncate(bits: Self::Bits) -> Self

Convert from a bits value, unsetting any unknown bits.
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fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set. Read more
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fn iter(&self) -> Iter<Self>

Yield a set of contained flags values. Read more
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fn iter_names(&self) -> IterNames<Self>

Yield a set of contained named flags values. Read more
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fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.
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fn is_all(&self) -> bool

Whether all known bits in this flags value are set.
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fn intersects(&self, other: Self) -> bool
where Self: Sized,

Whether any set bits in a source flags value are also set in a target flags value.
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fn contains(&self, other: Self) -> bool
where Self: Sized,

Whether all set bits in a source flags value are also set in a target flags value.
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fn insert(&mut self, other: Self)
where Self: Sized,

The bitwise or (|) of the bits in two flags values.
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fn remove(&mut self, other: Self)
where Self: Sized,

The intersection of a source flags value with the complement of a target flags value (&!). Read more
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fn toggle(&mut self, other: Self)
where Self: Sized,

The bitwise exclusive-or (^) of the bits in two flags values.
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fn set(&mut self, other: Self, value: bool)
where Self: Sized,

Call [Flags::insert] when value is true or [Flags::remove] when value is false.
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fn intersection(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.
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fn union(self, other: Self) -> Self

The bitwise or (|) of the bits in two flags values.
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fn difference(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!). Read more
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fn symmetric_difference(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.
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fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.
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impl From<usize> for OpenFlags

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fn from(val: usize) -> OpenFlags

Converts to this type from the input type.
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impl FromIterator<OpenFlags> for OpenFlags

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fn from_iter<T>(iterator: T) -> OpenFlags
where T: IntoIterator<Item = OpenFlags>,

The bitwise or (|) of the bits in each flags value.

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impl IntoIterator for OpenFlags

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type Item = OpenFlags

The type of the elements being iterated over.
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type IntoIter = Iter<OpenFlags>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> <OpenFlags as IntoIterator>::IntoIter

Creates an iterator from a value. Read more
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impl LowerHex for OpenFlags

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.
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impl Not for OpenFlags

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fn not(self) -> OpenFlags

The bitwise negation (!) of the bits in a flags value, truncating the result.

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type Output = OpenFlags

The resulting type after applying the ! operator.
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impl Octal for OpenFlags

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.
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impl Sub for OpenFlags

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fn sub(self, other: OpenFlags) -> OpenFlags

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

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type Output = OpenFlags

The resulting type after applying the - operator.
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impl SubAssign for OpenFlags

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fn sub_assign(&mut self, other: OpenFlags)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

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impl UpperHex for OpenFlags

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.
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impl Copy for OpenFlags

Auto Trait Implementations§

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> AsAny for T
where T: Any,

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fn as_any(&self) -> &(dyn Any + 'static)

把当前对象转化为 Any 类型,供后续 downcast 使用
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

供 downcast_mut 使用
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.