Enum signal_hook::low_level::siginfo::Cause

#[non_exhaustive]
pub enum Cause {
    Unknown,
    Kernel,
    Sent(Sent),
    Chld(Chld),
}

Available on crate feature extended-siginfo-raw only.

What caused a signal.

This is a best-effort (and possibly incomplete) representation of the C siginfo_t::si_code. It may differ between OSes and may be extended in future versions.

Note that this doesn’t contain all the „fault“ signals (SIGILL, SIGSEGV and similar). There’s no reasonable way to use the exfiltrators with them, since the handler either needs to terminate the process or somehow recover from the situation. Things based on exfiltrators do neither, which would cause an UB and therefore these values just don’t make sense.

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.

Unknown

The cause is unknown.

Some systems don’t fill this in. Some systems have values we don’t understand. Some signals don’t have specific reasons to come to being.

Kernel

Sent by the kernel.

This probably exists only on Linux.

Sent(Sent)

The signal was sent by other process.

Chld(Chld)

A SIGCHLD, caused by a child process changing state.

Trait Implementations

impl Clone for Cause

fn clone(&self) -> Cause

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Cause

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

Formats the value using the given formatter.

impl PartialEq<Cause> for Cause

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Cause

impl Eq for Cause

impl StructuralEq for Cause

impl StructuralPartialEq for Cause