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#![allow(missing_docs)]
use std::{fmt, io};
#[derive(Debug)]
pub struct Error {
kind: ErrorKind,
cause: Option<Box<dyn std::error::Error>>,
}
#[derive(Debug, PartialEq)]
pub enum ErrorKind {
Unknown,
UnexpectedSignal,
Init,
Unsupported,
VersionMismatch,
InvalidEventSpec,
AllocInit,
Unloaded,
AlreadyAttached,
BadScope,
LogFileRequired,
BusyTarget,
BadTarget,
Forbidden,
}
impl std::error::Error for Error {
fn description(&self) -> &str {
match self.kind {
ErrorKind::Init => "missing hwpmc in kernel",
ErrorKind::Unloaded => "hwpmc unloaded from kernel",
ErrorKind::Unsupported => "unsupported CPU",
ErrorKind::VersionMismatch => "unexpected hwpmc version",
ErrorKind::AllocInit => "failed to allocate counter",
ErrorKind::BusyTarget => "target is busy",
ErrorKind::BadTarget => "target PID does not exist",
ErrorKind::AlreadyAttached => "PMC already attached to target process",
ErrorKind::Forbidden => "forbidden",
_ => "unknown error",
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self)
}
}
#[doc(hidden)]
impl PartialEq for Error {
fn eq(&self, other: &Error) -> bool {
self.kind == other.kind
}
}
impl Error {
pub fn kind(&self) -> &ErrorKind {
&self.kind
}
}
pub(crate) fn new_os_error(kind: ErrorKind) -> Error {
Error {
kind,
cause: Some(Box::new(io::Error::last_os_error())),
}
}
pub(crate) fn new_error(kind: ErrorKind) -> Error {
Error { kind, cause: None }
}