Enum PatchError 

pub enum PatchError {
    Dlopen(String),
    AndroidMemfd(String),
    AnchorUnresolved,
    ReleaseBuild,
    ImageRangeUnresolved,
    LayoutMismatchPending(Vec<LayoutMismatch>),
    AnchorMismatch {
        image: &'static str,
        expected: u64,
        got: u64,
    },
}

Why a patch could not be applied. On every error nothing is installed and no handler runs.

Variants

Dlopen(String)

The patch library failed to load, or lacks the __frust_hotpatch_anchor symbol. A String rather than the loader’s error type keeps libloading out of the public API.

AndroidMemfd(String)

The Android memfd loader failed, most likely on a permissions issue.

AnchorUnresolved

No anchor is set (set_anchor was never called with a non-zero address), so the table’s keys cannot be rebased onto this process. Checked before the library is loaded.

ReleaseBuild

This is a release-profile build: patches are applied only under debug_assertions.

ImageRangeUnresolved

The platform could not say which loaded image holds an anchor, so missed keys could not be attributed to an image. Nothing is installed.

LayoutMismatchPending(Vec<LayoutMismatch>)

Layout-mismatch records are unreported (see report_layout_mismatch): no patch is applied over a known mismatch. Carries the unreported records; checked under the apply lock before anything is loaded, and cleared by mark_layout_mismatches_reported.

AnchorMismatch

The table’s anchor address for image ("base" or "patch") is not that image’s __frust_hotpatch_anchor link-time address: the offset it implies (got) differs from the image’s real slide (expected). A table anchored on another symbol (dx 0.7.10 anchors on main) is refused rather than rebased by a wrong constant. The "base" check runs before the library is loaded; for "patch" the library is already mapped and leaked (never unloaded), as with PatchError::ImageRangeUnresolved after the load. Nothing is registered or installed.

Fields

image: &'static str

Which image’s anchor disagrees: "base" or "patch".

expected: u64

The image’s real slide, from the platform loader.

got: u64

The offset the table’s anchor address implies.

Trait Implementations

impl Debug for PatchError

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

Formats the value using the given formatter.

impl Display for PatchError

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

Formats the value using the given formatter.

impl Error for PatchError

fn source(&self) -> Option<&(dyn Error + '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.

impl PartialEq for PatchError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PatchError