// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2025 Google LLC. use kernel::fmt;use kernel::prelude::*; use crate::defs::*; pub(crate) type BinderResult<T = ()> = core::result::Result<T, BinderError>; /// An error that will be returned to userspace via the `BINDER_WRITE_READ` ioctl rather than via/// errno.pub(crate) struct BinderError {    pub(crate) reply: u32,    pub(crate) source: Option<Error>,} impl BinderError {    pub(crate) fn new_dead() -> Self {        Self {            reply: BR_DEAD_REPLY,            source: None,        }    }     pub(crate) fn new_frozen() -> Self {        Self {            reply: BR_FROZEN_REPLY,            source: None,        }    }     pub(crate) fn new_frozen_oneway() -> Self {        Self {            reply: BR_TRANSACTION_PENDING_FROZEN,            source: None,        }    }     pub(crate) fn is_dead(&self) -> bool {        self.reply == BR_DEAD_REPLY    }} /// Convert an errno into a `BinderError` and store the errno used to construct it. The errno/// should be stored as the thread's extended error when given to userspace.impl From<Error> for BinderError {    fn from(source: Error) -> Self {        Self {            reply: BR_FAILED_REPLY,            source: Some(source),        }    }} impl From<kernel::fs::file::BadFdError> for BinderError {    fn from(source: kernel::fs::file::BadFdError) -> Self {        BinderError::from(Error::from(source))    }} impl From<kernel::alloc::AllocError> for BinderError {    fn from(_: kernel::alloc::AllocError) -> Self {        Self {            reply: BR_FAILED_REPLY,            source: Some(ENOMEM),        }    }} impl fmt::Debug for BinderError {    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {        match self.reply {            BR_FAILED_REPLY => match self.source.as_ref() {                Some(source) => source.fmt(f),                None => f.pad("BR_FAILED_REPLY"),            },            BR_DEAD_REPLY => f.pad("BR_DEAD_REPLY"),            BR_FROZEN_REPLY => f.pad("BR_FROZEN_REPLY"),            BR_TRANSACTION_PENDING_FROZEN => f.pad("BR_TRANSACTION_PENDING_FROZEN"),            BR_TRANSACTION_COMPLETE => f.pad("BR_TRANSACTION_COMPLETE"),            _ => match self.source.as_ref() {                Some(source) => source.fmt(f),                None => self.reply.fmt(f),            },        }    }}