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extern crate libc;
#[macro_use]
extern crate nom;
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::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: &'static str = "/var/run/devd.seqpacket.pipe";
pub fn parse_devd_event(e: String) -> Result<Event> {
match parser::event(e.as_str()) {
Ok((_, x)) => Ok(x),
_ => Err(Error::Parse),
}
}
#[derive(Debug)]
pub struct Context {
sock: BufReader<UnixStream>,
sockfd: RawFd,
}
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: sockfd,
})
}
}
/// 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> {
let mut fds = vec![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) };
if x < 0 {
Err(io::Error::last_os_error().into())
} else if x == 0 {
Err(Error::Timeout)
} else {
let mut s = String::new();
let _ = self.sock.read_line(&mut s);
Ok(s)
}
}
/// Waits for an event using poll(), reads and parses it
pub fn wait_for_event<'a>(&mut self, timeout_ms: usize) -> Result<Event> {
self.wait_for_event_raw(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> {
let mut s = String::new();
let _ = self.sock.read_line(&mut s);
parse_devd_event(s)
}
}
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