Struct ReadError 

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

An error returned while reading memory from a target process.

ReadError is intentionally a small public wrapper around private strategy errors. Its Display implementation describes the high-level failure. Its core::error::Error::source implementation returns a lower-level source when there is exactly one failed strategy, including failures from forced strategies and failures from a strategy selected by an automatic reader.

Short successful reads are not represented by ReadError; they are returned from crate::ProcessReader::read_at as Ok(n) where n is smaller than the requested buffer length.

When crate::ProcessReader::new tries every strategy and all of them fail, there is no single source error. In that case core::error::Error::source returns None, and callers can inspect each branch with ReadError::virtual_mem_error, ReadError::file_error, and ReadError::ptrace_error.

If the serde feature is enabled, this type implements Serialize and Deserialize.

Implementations

impl ReadError

pub fn virtual_mem_error(&self) -> Option<&(dyn StdError + 'static)>

Returns the error from the process_vm_readv(2) strategy, if present.

This returns Some when a reader forced to or cached on crate::ProcessReader::for_virtual_mem fails, and when automatic strategy selection fails after attempting process_vm_readv.

It returns None when the error does not contain a process_vm_readv failure.

pub fn file_error(&self) -> Option<&(dyn StdError + 'static)>

Returns the error from the /proc/<pid>/mem strategy, if present.

This returns Some when a reader forced to or cached on crate::ProcessReader::for_file fails, and when automatic strategy selection fails after attempting to use /proc/<pid>/mem.

It returns None when the error does not contain a /proc/<pid>/mem failure.

pub fn ptrace_error(&self) -> Option<&(dyn StdError + 'static)>

Returns the error from the ptrace(PTRACE_PEEKDATA) strategy, if present.

This returns Some when a reader forced to or cached on crate::ProcessReader::for_ptrace fails, and when automatic strategy selection fails after attempting ptrace(PTRACE_PEEKDATA).

It returns None when the error does not contain a ptrace failure.

Trait Implementations

impl Debug for ReadError

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

Formats the value using the given formatter.

impl Display for ReadError

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

Formats the value using the given formatter.

impl Error for ReadError

fn source(&self) -> Option<&(dyn StdError + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.