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Add ExitStatusExt::task_retcode for Fuchsia platform
The method task_retcode() method improves the ergonomics of determining if a Fuchsia process was killed by the kernel and for what reason.
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//! Fuchsia-specific extensions to primitives in the [`std::process`] module. | ||
//! | ||
//! [`std::process`]: crate::process | ||
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use crate::process; | ||
use crate::sealed::Sealed; | ||
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#[unstable(feature = "fuchsia_exit_status", issue = "none")] | ||
pub type zx_status_t = i32; | ||
#[unstable(feature = "fuchsia_exit_status", issue = "none")] | ||
pub const ZX_TASK_RETCODE_SYSCALL_KILL: zx_status_t = -1024; | ||
#[unstable(feature = "fuchsia_exit_status", issue = "none")] | ||
pub const ZX_TASK_RETCODE_OOM_KILL: zx_status_t = -1025; | ||
#[unstable(feature = "fuchsia_exit_status", issue = "none")] | ||
pub const ZX_TASK_RETCODE_POLICY_KILL: zx_status_t = -1026; | ||
#[unstable(feature = "fuchsia_exit_status", issue = "none")] | ||
pub const ZX_TASK_RETCODE_VDSO_KILL: zx_status_t = -1027; | ||
/// On Zircon (the Fuchsia kernel), an abort from userspace calls the | ||
/// LLVM implementation of __builtin_trap(), e.g., ud2 on x86, which | ||
/// raises a kernel exception. If a userspace process does not | ||
/// otherwise arrange exception handling, the kernel kills the process | ||
/// with this return code. | ||
#[unstable(feature = "fuchsia_exit_status", issue = "none")] | ||
pub const ZX_TASK_RETCODE_EXCEPTION_KILL: zx_status_t = -1028; | ||
#[unstable(feature = "fuchsia_exit_status", issue = "none")] | ||
pub const ZX_TASK_RETCODE_CRITICAL_PROCESS_KILL: zx_status_t = -1029; | ||
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#[unstable(feature = "fuchsia_exit_status", issue = "none")] | ||
pub trait ExitStatusExt: Sealed { | ||
/// If the task was killed, returns the `ZX_TASK_RETCODE_*`. | ||
#[must_use] | ||
fn task_retcode(&self) -> Option<i32>; | ||
} | ||
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#[unstable(feature = "fuchsia_exit_status", issue = "none")] | ||
impl ExitStatusExt for process::ExitStatus { | ||
fn task_retcode(&self) -> Option<i32> { | ||
self.code().and_then(|code| { | ||
if code == ZX_TASK_RETCODE_SYSCALL_KILL | ||
|| code == ZX_TASK_RETCODE_OOM_KILL | ||
|| code == ZX_TASK_RETCODE_POLICY_KILL | ||
|| code == ZX_TASK_RETCODE_VDSO_KILL | ||
|| code == ZX_TASK_RETCODE_EXCEPTION_KILL | ||
|| code == ZX_TASK_RETCODE_CRITICAL_PROCESS_KILL | ||
{ | ||
Some(code) | ||
} else { | ||
None | ||
} | ||
}) | ||
} | ||
} |
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