Struct Fd 

pub struct Fd(/* private fields */);

Available on crate feature sys only.

File descriptor.

This type provides type-safe file descriptors. It uses the newtype pattern with #[repr(transparent)] for zero-cost abstraction.

Standard File Descriptors

• 0: Standard input (stdin)
• 1: Standard output (stdout)
• 2: Standard error (stderr)

Platform Differences

• Linux/Unix: FDs are typically 32-bit signed integers
• Windows: Handles are used instead of FDs (this type is for Unix-like systems)

Implementations

impl Fd

pub const MAX: i32 = 1_048_576

Available on Linux only.

Maximum valid FD value (platform-dependent)

pub const STDIN: Self

Standard input file descriptor

pub const STDOUT: Self

Standard output file descriptor

pub const STDERR: Self

Standard error file descriptor

pub const fn new(value: i32) -> Result<Self, FdError>

Creates a new FD from a value.

Errors

Returns an error if value is negative or exceeds maximum.

pub const fn new_unchecked(value: i32) -> Self

Creates a new FD without validation.

This constructor bypasses validation and should only be used when the caller can guarantee the value is a valid file descriptor. For validated construction, use Fd::new.

Examples

use bare_types::sys::Fd;

// Standard file descriptors can be created directly
let stdin = Fd::new_unchecked(0);
assert!(stdin.is_stdin());

pub const fn as_i32(&self) -> i32

Returns the FD value.

pub const fn is_standard(&self) -> bool

Returns true if this is a standard file descriptor (stdin, stdout, or stderr).

pub const fn is_stdin(&self) -> bool

Returns true if this is stdin.

pub const fn is_stdout(&self) -> bool

Returns true if this is stdout.

pub const fn is_stderr(&self) -> bool

Returns true if this is stderr.

Trait Implementations

impl<'a> Arbitrary<'a> for Fd

Available on crate feature arbitrary only.

fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self>

Generate an arbitrary value of Self from the given unstructured data.

fn arbitrary_take_rest(u: Unstructured<'a>) -> Result<Self, Error>

Generate an arbitrary value of Self from the entirety of the given unstructured data.

fn size_hint(depth: usize) -> (usize, Option<usize>)

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

fn try_size_hint( depth: usize, ) -> Result<(usize, Option<usize>), MaxRecursionReached>

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

impl Clone for Fd

fn clone(&self) -> Fd

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Fd

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Fd

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Fd

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

Formats the value using the given formatter.

impl FromStr for Fd

type Err = FdError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for Fd

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

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Fd

fn cmp(&self, other: &Fd) -> 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 Fd

fn eq(&self, other: &Fd) -> 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 Fd

fn partial_cmp(&self, other: &Fd) -> 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 Serialize for Fd

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<i32> for Fd

type Error = FdError

The type returned in the event of a conversion error.

fn try_from(value: i32) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<u32> for Fd

type Error = FdError

The type returned in the event of a conversion error.

fn try_from(value: u32) -> Result<Self, Self::Error>

Performs the conversion.

impl Copy for Fd

impl Eq for Fd

impl StructuralPartialEq for Fd