Enum SyncError 

#[non_exhaustive]
pub enum SyncError {
    Empty,
    TimedOut,
    MergeReturnedNothing,
    Io(Errno),
}

Errors from fence operations.

The variants mirror the C++ failure cases one for one, and converting to io::Error gives the errno the C++ std::error_code carries for each – EBADF, ETIMEDOUT, EBADF, or the syscall’s own – so a consumer bridging both implementations sees the same classification. In particular EAGAIN-style flow control never hides inside a generic I/O error.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Empty

The fence holds no descriptor.

The C++ reports errc::bad_file_descriptor for this, and for a negative fd handed to import_fd. The latter case cannot arise here: SyncFence::import takes a BorrowedFd, so an invalid descriptor is a type error rather than a runtime one.

TimedOut

The wait expired before the fence signaled. errc::timed_out.

MergeReturnedNothing

The merge ioctl succeeded but returned no descriptor. errc::bad_file_descriptor, as in the C++.

Io(Errno)

An underlying syscall failed.

Trait Implementations

impl Debug for SyncError

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

Formats the value using the given formatter.

impl Display for SyncError

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

Formats the value using the given formatter.

impl Error for SyncError

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 From<Errno> for SyncError

fn from(source: Errno) -> Self

Converts to this type from the input type.

impl From<SyncError> for Error

fn from(e: SyncError) -> Self

Converts to this type from the input type.