Enum FileMode 

pub enum FileMode {
    Read = 0,
    Write = 1,
    ReadWrite = 2,
}

The FileMode enum represents the access modes available when opening a file.

This enum is used by user program to specify how a file is opened, determining which operations can be performed on the file. It defines three basic modes:

• FileMode::Read: The file is opened for reading only.
• FileMode::Write: The file is opened for writing only.
• FileMode::ReadWrite: The file is opened for both reading and writing.

These modes are used to control how the file descriptor behaves when interacting with the file (e.g., reading, writing, or both).

Variants

Read = 0

Read-only access to the file.

In this mode, the file can only be read from, and no changes can be made to the file’s contents.

Write = 1

Write-only access to the file.

In this mode, the file can only be written to, and any existing content in the file is overwritten with new data.

ReadWrite = 2

Both Read and Write access to the file.

In this mode, the file can both be read and written, and does NOT removes existing content, but can be overwritten with new data.

Trait Implementations

impl Clone for FileMode

fn clone(&self) -> FileMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FileMode

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

Formats the value using the given formatter.

impl Ord for FileMode

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

This method returns an [Ordering] between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for FileMode

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for FileMode

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

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

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for FileMode

impl Eq for FileMode

impl StructuralPartialEq for FileMode