109 lines
2.8 KiB
Rust
109 lines
2.8 KiB
Rust
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/*
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* This file is part of espanso.
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*
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* Copyright (C) 2019-2021 Federico Terzi
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*
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* espanso is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* espanso is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with espanso. If not, see <https://www.gnu.org/licenses/>.
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*/
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use std::ffi::CString;
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use libc::{c_uint, close, ioctl, open, O_NONBLOCK, O_WRONLY};
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use scopeguard::ScopeGuard;
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use anyhow::Result;
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use thiserror::Error;
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use super::ffi::{
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setup_uinput_device, ui_dev_create, ui_dev_destroy, ui_set_evbit, ui_set_keybit, uinput_emit,
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EV_KEY,
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};
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pub struct UInputDevice {
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fd: i32,
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}
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impl UInputDevice {
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pub fn new() -> Result<UInputDevice> {
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let uinput_path = CString::new("/dev/uinput").expect("unable to generate /dev/uinput path");
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let raw_fd = unsafe { open(uinput_path.as_ptr(), O_WRONLY | O_NONBLOCK) };
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if raw_fd < 0 {
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return Err(UInputDeviceError::OpenFailed().into());
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}
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let fd = scopeguard::guard(raw_fd, |raw_fd| unsafe {
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close(raw_fd);
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});
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// Enable keyboard events
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if unsafe { ioctl(*fd, ui_set_evbit(), EV_KEY as c_uint) } != 0 {
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return Err(UInputDeviceError::KeyEVBitFailed().into());
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}
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// Register all keycodes
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for key_code in 0..256 {
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if unsafe { ioctl(*fd, ui_set_keybit(), key_code) } != 0 {
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return Err(UInputDeviceError::KeyBitFailed().into());
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}
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}
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// Register the virtual device
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if unsafe { setup_uinput_device(*fd) } != 0 {
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return Err(UInputDeviceError::DeviceSetupFailed().into());
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}
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// Create the device
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if unsafe { ioctl(*fd, ui_dev_create()) } != 0 {
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return Err(UInputDeviceError::DeviceCreateFailed().into());
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}
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Ok(Self {
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fd: ScopeGuard::into_inner(fd),
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})
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}
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pub fn emit(&self, key_code: u32, pressed: bool) {
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let pressed = if pressed { 1 } else { 0 };
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unsafe {
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uinput_emit(self.fd, key_code, pressed);
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}
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}
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}
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impl Drop for UInputDevice {
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fn drop(&mut self) {
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unsafe {
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ioctl(self.fd, ui_dev_destroy());
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close(self.fd);
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}
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}
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}
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#[derive(Error, Debug)]
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pub enum UInputDeviceError {
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#[error("could not open uinput device")]
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OpenFailed(),
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#[error("could not set keyboard evbit")]
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KeyEVBitFailed(),
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#[error("could not set keyboard keybit")]
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KeyBitFailed(),
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#[error("could not register virtual device")]
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DeviceSetupFailed(),
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#[error("could not create uinput device")]
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DeviceCreateFailed(),
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}
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