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#![deny(missing_docs)]
#![cfg_attr(feature="nightly", feature(libc))]
#[macro_use]
extern crate log;
#[cfg(feature="nightly")]
extern crate libc;
use std::fs::{OpenOptions, File};
use std::io::Write;
use std::sync::Mutex;
use log::{Log, LogMetadata, LogRecord, LogLevel, MaxLogLevelFilter, LogLevelFilter, SetLoggerError};
pub struct KernelLog {
kmsg: Mutex<File>
}
impl KernelLog {
pub fn new() -> KernelLog {
KernelLog {
kmsg: Mutex::new(OpenOptions::new().write(true).open("/dev/kmsg").unwrap())
}
}
pub fn init(filter: MaxLogLevelFilter) -> Box<Log> {
filter.set(LogLevelFilter::Trace);
Box::new(KernelLog::new())
}
}
impl Log for KernelLog {
fn enabled(&self, _meta: &LogMetadata) -> bool {
true
}
#[cfg(feature="nightly")]
fn log(&self, record: &LogRecord) {
let level: u8 = match record.level() {
LogLevel::Error => 3,
LogLevel::Warn => 4,
LogLevel::Info => 5,
LogLevel::Debug => 6,
LogLevel::Trace => 7,
};
let mut buf = Vec::new();
writeln!(buf, "<{}>{}[{}]: {}", level, record.target(),
unsafe { ::libc::funcs::posix88::unistd::getpid() },
record.args()).unwrap();
if let Ok(mut kmsg) = self.kmsg.lock() {
let _ = kmsg.write(&buf);
let _ = kmsg.flush();
}
}
#[cfg(not(feature="nightly"))]
fn log(&self, record: &LogRecord) {
let level: u8 = match record.level() {
LogLevel::Error => 3,
LogLevel::Warn => 4,
LogLevel::Info => 5,
LogLevel::Debug => 6,
LogLevel::Trace => 7,
};
let mut buf = Vec::new();
writeln!(buf, "<{}>{}: {}", level, record.target(), record.args()).unwrap();
if let Ok(mut kmsg) = self.kmsg.lock() {
let _ = kmsg.write(&buf);
let _ = kmsg.flush();
}
}
}
pub fn init() -> Result<(), SetLoggerError> {
log::set_logger(KernelLog::init)
}
#[cfg(test)]
mod tests {
use super::{KernelLog, init};
#[test]
fn log_to_kernel() {
init().unwrap();
debug!("hello, world!");
}
}