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use std::cmp;
use std::sync::Arc;
use std::sync::mpsc::{ Receiver, TryRecvError };
use std::collections::HashMap;
use std::os::fd::{AsFd, AsRawFd, FromRawFd, OwnedFd};
use ::{AtomEnum, EventMask};
use x11rb::connection::Connection;
use x11rb::protocol::Event;
use x11rb::protocol::xproto::{Atom, ChangeWindowAttributesAux, ConnectionExt, Property, PropMode, SELECTION_NOTIFY_EVENT, SelectionNotifyEvent, Window};
use ::{ INCR_CHUNK_SIZE, Context, SetMap };
use error::Error;
macro_rules! try_continue {
( $expr:expr ) => {
match $expr {
Some(val) => val,
None => continue
}
};
}
struct IncrState {
selection: Atom,
requestor: Window,
property: Atom,
pos: usize
}
pub(crate) struct PipeDropFds {
pub(crate) read_pipe: OwnedFd,
pub(crate) write_pipe: OwnedFd,
}
pub(crate) fn create_pipe_drop_fd() -> Result<PipeDropFds, Error>{
let pipe_drop_fds = unsafe {
// Docs Linux: https://man7.org/linux/man-pages/man2/pipe.2.html
// Posix: https://pubs.opengroup.org/onlinepubs/9699919799/
// Safety: See above docs, api expects a 2-long array of file descriptors, and flags
let mut pipes: [libc::c_int; 2] = [0, 0];
let pipe_create_res = libc::pipe2(pipes.as_mut_ptr(), libc::O_CLOEXEC);
if pipe_create_res < 0 {
// Don't want to have to read from errno_location, just skip propagating errno.
return Err(Error::EventFdCreate);
}
// Safety: Trusting the OS to give correct FDs
let read_pipe = OwnedFd::from_raw_fd(pipes[0]);
let write_pipe = OwnedFd::from_raw_fd(pipes[1]);
PipeDropFds {
read_pipe,
write_pipe,
}
};
Ok(pipe_drop_fds)
}
pub(crate) fn run(context: Arc<Context>, setmap: SetMap, max_length: usize, receiver: Receiver<Atom>, read_pipe: OwnedFd) {
let mut incr_map = HashMap::<Atom, Atom>::new();
let mut state_map = HashMap::<Atom, IncrState>::new();
let stream_fd = context.connection.stream().as_fd();
let borrowed_fd = read_pipe.as_fd();
// Poll stream for new Read-ready events, check if the other side of the pipe has been dropped
let mut pollfds: [libc::pollfd; 2] = [libc::pollfd {
fd: stream_fd.as_raw_fd(),
events: libc::POLLIN,
revents: 0,
}, libc::pollfd {
fd: borrowed_fd.as_raw_fd(),
// If the other end is dropped, this pipe will get a HUP on poll
events: libc::POLLHUP,
revents: 0,
}];
let len = pollfds.len();
loop {
unsafe {
// Docs Linux: https://man7.org/linux/man-pages/man2/poll.2.html
// Posix: https://pubs.opengroup.org/onlinepubs/9699919799/
// Safety: Passing in a mutable pointer that lives for the duration of the call, the length is
// set to the length of that pointer.
// Any negative value (-1 for example) means infinite timeout.
let poll_res = libc::poll(&mut pollfds as *mut libc::pollfd, len as libc::nfds_t, -1);
if poll_res < 0 {
// Error polling, can't continue
return;
}
}
if pollfds[1].revents & libc::POLLHUP != 0 {
// kill-signal on pollfd
return;
}
loop {
let evt = if let Ok(evt) = context.connection.poll_for_event() {
evt
} else {
// Connection died, exit
return;
};
let event = if let Some(evt) = evt {
evt
} else {
// No event on POLLIN happens, fd being readable doesn't mean there's a complete event ready to read.
// Poll again.
break;
};
loop {
match receiver.try_recv() {
Ok(selection) => if let Some(property) = incr_map.remove(&selection) {
state_map.remove(&property);
},
Err(TryRecvError::Empty) => break,
Err(TryRecvError::Disconnected) => if state_map.is_empty() {
return
}
}
}
match event {
Event::SelectionRequest(event) => {
let read_map = try_continue!(setmap.read().ok());
let &(target, ref value) = try_continue!(read_map.get(&event.selection));
if event.target == context.atoms.targets {
let _ = x11rb::wrapper::ConnectionExt::change_property32(
&context.connection,
PropMode::REPLACE,
event.requestor,
event.property,
Atom::from(AtomEnum::ATOM),
&[context.atoms.targets, target]
);
} else if value.len() < max_length - 24 {
let _ = x11rb::wrapper::ConnectionExt::change_property8(
&context.connection,
PropMode::REPLACE,
event.requestor,
event.property,
target,
value
);
} else {
let _ = context.connection.change_window_attributes(
event.requestor,
&ChangeWindowAttributesAux::new()
.event_mask(EventMask::PROPERTY_CHANGE)
);
let _ = x11rb::wrapper::ConnectionExt::change_property32(
&context.connection,
PropMode::REPLACE,
event.requestor,
event.property,
context.atoms.incr,
&[0u32; 0],
);
incr_map.insert(event.selection, event.property);
state_map.insert(
event.property,
IncrState {
selection: event.selection,
requestor: event.requestor,
property: event.property,
pos: 0
}
);
}
let _ = context.connection.send_event(
false,
event.requestor,
EventMask::default(),
SelectionNotifyEvent {
response_type: SELECTION_NOTIFY_EVENT,
sequence: 0,
time: event.time,
requestor: event.requestor,
selection: event.selection,
target: event.target,
property: event.property
}
);
let _ = context.connection.flush();
},
Event::PropertyNotify(event) => {
if event.state != Property::DELETE { continue };
let is_end = {
let state = try_continue!(state_map.get_mut(&event.atom));
let read_setmap = try_continue!(setmap.read().ok());
let &(target, ref value) = try_continue!(read_setmap.get(&state.selection));
let len = cmp::min(INCR_CHUNK_SIZE, value.len() - state.pos);
let _ = x11rb::wrapper::ConnectionExt::change_property8(
&context.connection,
PropMode::REPLACE,
state.requestor,
state.property,
target,
&value[state.pos..][..len]
);
state.pos += len;
len == 0
};
if is_end {
state_map.remove(&event.atom);
}
let _ = context.connection.flush();
},
Event::SelectionClear(event) => {
if let Some(property) = incr_map.remove(&event.selection) {
state_map.remove(&property);
}
if let Ok(mut write_setmap) = setmap.write() {
write_setmap.remove(&event.selection);
}
}
_ => ()
}
}
}
}