Struct CompletionEntry 

pub struct CompletionEntry {
    pub user_data: u64,
    pub result: i32,
    pub flags: u32,
}

Completion queue entry 完成队列条目

Represents a completed I/O operation returned from the kernel. 表示从内核返回的已完成的I/O操作。

Fields

user_data: u64

User data from the corresponding submission / 来自相应提交的用户数据

result: i32

Result code: positive = bytes transferred, negative = error code 结果码：正数=传输的字节数，负数=错误码

flags: u32

Operation flags / 操作标志

Implementations

impl CompletionEntry

pub const fn new(user_data: u64, result: i32, flags: u32) -> Self

Create a new completion entry 创建新的完成条目

pub const fn is_success(self) -> bool

Check if the operation succeeded 检查操作是否成功

pub const fn is_error(self) -> bool

Check if the operation failed 检查操作是否失败

pub const fn bytes_transferred(self) -> Option<u32>

Get the number of bytes transferred 获取传输的字节数

Returns None if the operation failed. 如果操作失败则返回 None。

pub const fn error_code(self) -> Option<i32>

Get the error code if the operation failed 如果操作失败，获取错误码

pub fn into_result(self) -> Result<u32>

Convert the result to a std::io::Result 将结果转换为 std::io::Result

Returns Ok(bytes_transferred) on success, Err(error) on failure. 成功返回 Ok(bytes_transferred)，失败返回 Err(error)。

Trait Implementations

impl Clone for CompletionEntry

fn clone(&self) -> CompletionEntry

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CompletionEntry

impl Debug for CompletionEntry

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

Formats the value using the given formatter.