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pub mod data;
pub mod parser;
pub mod result;
use io::{BufRead, BufReader};
use libc::{c_int, connect, nfds_t, poll, pollfd, sockaddr_un, socket, AF_UNIX, POLLIN, SOCK_SEQPACKET};
use std::cmp::Ordering;
use std::os::unix::io::{FromRawFd, RawFd};
use std::os::unix::net::UnixStream;
use std::{io, mem, ptr};
pub use data::*;
pub use result::*;
const SOCKET_PATH: &str = "/var/run/devd.seqpacket.pipe";
pub fn parse_devd_event(event: &str) -> Result<Event> {
match parser::event(event) {
Ok((_, x)) => Ok(x),
_ => Err(Error::Parse),
}
}
#[derive(Debug)]
pub struct Context {
sock: BufReader<UnixStream>,
sockfd: RawFd,
buffer: String,
}
impl Context {
pub fn new() -> Result<Context> {
unsafe {
let sockfd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if sockfd < 0 {
return Err(io::Error::last_os_error().into());
}
let mut sockaddr = sockaddr_un { sun_family: AF_UNIX as _, ..mem::zeroed() };
ptr::copy_nonoverlapping(SOCKET_PATH.as_ptr(), sockaddr.sun_path.as_mut_ptr() as *mut u8, SOCKET_PATH.len());
if connect(
sockfd,
&sockaddr as *const sockaddr_un as *const _,
(mem::size_of_val(&AF_UNIX) + SOCKET_PATH.len()) as _,
) < 0
{
return Err(io::Error::last_os_error().into());
}
Ok(Context {
sock: BufReader::new(UnixStream::from_raw_fd(sockfd)),
sockfd,
buffer: String::new(),
})
}
}
pub fn wait_for_event_raw_internal(&mut self, timeout_ms: usize) -> Result<&str> {
let mut fds = [pollfd { fd: self.sockfd, events: POLLIN, revents: 0 }];
let x = unsafe { poll((&mut fds).as_mut_ptr(), fds.len() as nfds_t, timeout_ms as c_int) };
match x.cmp(&0) {
Ordering::Less => Err(io::Error::last_os_error().into()),
Ordering::Equal => Err(Error::Timeout),
Ordering::Greater => {
self.buffer.clear();
self.sock.read_line(&mut self.buffer)?;
Ok(&self.buffer)
}
}
}
/// Waits for an event using poll(), reads it but does not parse
pub fn wait_for_event_raw(&mut self, timeout_ms: usize) -> Result<String> {
self.wait_for_event_raw_internal(timeout_ms).map(ToOwned::to_owned)
}
/// Waits for an event using poll(), reads and parses it
pub fn wait_for_event(&mut self, timeout_ms: usize) -> Result<Event> {
self.wait_for_event_raw_internal(timeout_ms).and_then(parse_devd_event)
}
/// Returns the devd socket file descriptor in case you want to select/poll on it together with
/// other file descriptors
pub fn fd(&self) -> RawFd {
self.sockfd
}
/// Reads an event and parses it. Use when polling on the raw fd by yourself
pub fn read_event(&mut self) -> Result<Event> {
self.buffer.clear();
self.sock.read_line(&mut self.buffer)?;
parse_devd_event(&self.buffer)
}
}
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