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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2025 Google LLC.
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,
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
}
pub(crate) fn as_errno(&self) -> kernel::ffi::c_int {
self.source.unwrap_or(EINVAL).to_errno()
}
pub(crate) fn should_pr_warn(&self) -> bool {
self.source.is_some()
}
}
/// 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 core::fmt::Debug for BinderError {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
match self.reply {
BR_FAILED_REPLY => match self.source.as_ref() {
Some(source) => f
.debug_struct("BR_FAILED_REPLY")
.field("source", source)
.finish(),
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"),
_ => f
.debug_struct("BinderError")
.field("reply", &self.reply)
.finish(),
}
}
}
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