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use std::{
cell::{Cell, RefCell},
ffi::{CString, OsString},
io,
os::unix::io::RawFd,
process::abort,
rc::Rc,
};
use failure::Fail;
use libc::{STDIN_FILENO, STDOUT_FILENO};
use nix::{
fcntl::{fcntl, FcntlArg, OFlag},
sys::wait::{waitpid, WaitStatus},
unistd::{close, dup2, execvp, fork, ForkResult},
};
use wayland_client::{
global_filter, protocol::wl_seat::WlSeat, ConnectError, Display, GlobalError, GlobalManager, Interface, Main,
};
use wayland_protocols::wlr::unstable::data_control::v1::client::zwlr_data_control_manager_v1::ZwlrDataControlManagerV1;
use crate::{
handlers::{data_device_handler, seat_handler, DataDeviceHandler},
seat_data::SeatData,
};
pub fn is_text(mime_type: &str) -> bool {
match mime_type {
"TEXT" | "STRING" | "UTF8_STRING" => true,
x if x.starts_with("text/") => true,
_ => false,
}
}
#[derive(Fail, Debug)]
pub enum CopyDataError {
#[fail(display = "Couldn't set the source file descriptor flags")]
SetSourceFdFlags(#[cause] nix::Error),
#[fail(display = "Couldn't set the target file descriptor flags")]
SetTargetFdFlags(#[cause] nix::Error),
#[fail(display = "Couldn't fork")]
Fork(#[cause] nix::Error),
#[fail(display = "Couldn't close the source file descriptor")]
CloseSourceFd(#[cause] nix::Error),
#[fail(display = "Couldn't close the target file descriptor")]
CloseTargetFd(#[cause] nix::Error),
#[fail(display = "Couldn't wait for the child process")]
Wait(#[cause] nix::Error),
#[fail(display = "Received an unexpected status when waiting for the child process: {:?}",
_0)]
WaitUnexpected(WaitStatus),
#[fail(display = "The child process exited with a non-zero error code: {}", _0)]
ChildError(i32),
}
pub fn copy_data(from_fd: Option<RawFd>, to_fd: RawFd, wait: bool) -> Result<(), CopyDataError> {
if let Some(from_fd) = from_fd {
fcntl(from_fd, FcntlArg::F_SETFL(OFlag::empty())).map_err(CopyDataError::SetSourceFdFlags)?;
}
fcntl(to_fd, FcntlArg::F_SETFL(OFlag::empty())).map_err(CopyDataError::SetTargetFdFlags)?;
let cat = CString::new("cat").unwrap();
let fork_result = fork().map_err(CopyDataError::Fork)?;
match fork_result {
ForkResult::Child => {
if let Some(fd) = from_fd {
if dup2(fd, STDIN_FILENO).is_err() {
abort();
}
}
if dup2(to_fd, STDOUT_FILENO).is_err() {
abort();
}
if let Some(fd) = from_fd {
if close(fd).is_err() {
abort();
}
}
if close(to_fd).is_err() {
abort();
}
if execvp(&cat, &[&cat]).is_err() {
abort();
}
}
ForkResult::Parent { child } => {
if let Some(fd) = from_fd {
close(fd).map_err(CopyDataError::CloseSourceFd)?;
}
close(to_fd).map_err(CopyDataError::CloseTargetFd)?;
if wait {
match waitpid(child, None).map_err(CopyDataError::Wait)? {
WaitStatus::Exited(_, status) => {
if status != 0 {
return Err(CopyDataError::ChildError(status));
}
}
x => return Err(CopyDataError::WaitUnexpected(x)),
}
}
}
}
Ok(())
}
#[derive(Fail, Debug)]
pub enum PrimarySelectionCheckError {
#[fail(display = "There are no seats")]
NoSeats,
#[fail(display = "Couldn't connect to the Wayland compositor")]
WaylandConnection(#[cause] ConnectError),
#[fail(display = "Wayland compositor communication error")]
WaylandCommunication(#[cause] io::Error),
#[fail(display = "A required Wayland protocol ({} version {}) is not supported by the compositor",
name, version)]
MissingProtocol { name: &'static str, version: u32 },
}
#[inline]
pub fn is_primary_selection_supported() -> Result<bool, PrimarySelectionCheckError> {
is_primary_selection_supported_internal(None)
}
pub(crate) fn is_primary_selection_supported_internal(socket_name: Option<OsString>)
-> Result<bool, PrimarySelectionCheckError> {
let display = match socket_name {
Some(name) => Display::connect_to_name(name),
None => Display::connect_to_env(),
}.map_err(PrimarySelectionCheckError::WaylandConnection)?;
let mut queue = display.create_event_queue();
let display = display.attach(queue.token());
let seats = Rc::new(RefCell::new(Vec::<Main<WlSeat>>::new()));
let seats_2 = seats.clone();
let global_manager =
GlobalManager::new_with_cb(&display,
global_filter!([WlSeat, 2, move |seat: Main<WlSeat>, _: DispatchData| {
let seat_data = RefCell::new(SeatData::default());
seat.as_ref().user_data().set(move || seat_data);
seat.quick_assign(seat_handler);
seats_2.borrow_mut().push(seat);
}]));
queue.sync_roundtrip(&mut (), |_, _, _| {})
.map_err(PrimarySelectionCheckError::WaylandCommunication)?;
let clipboard_manager = match global_manager.instantiate_exact::<ZwlrDataControlManagerV1>(2) {
Ok(manager) => manager,
Err(GlobalError::Missing) => {
return Err(PrimarySelectionCheckError::MissingProtocol { name: ZwlrDataControlManagerV1::NAME,
version: 1 })
}
Err(GlobalError::VersionTooLow(_)) => return Ok(false),
};
if seats.borrow_mut().is_empty() {
return Err(PrimarySelectionCheckError::NoSeats);
}
let supports_primary = Rc::new(Cell::new(false));
for seat in &*seats.borrow_mut() {
let mut handler = DataDeviceHandler::new(seat.detach(), true, supports_primary.clone());
let device = clipboard_manager.get_data_device(seat);
device.quick_assign(move |data_device, event, dispatch_data| {
data_device_handler(&mut handler, data_device, event, dispatch_data)
});
}
queue.sync_roundtrip(&mut (), |_, _, _| {})
.map_err(PrimarySelectionCheckError::WaylandCommunication)?;
Ok(supports_primary.get())
}