Program Listing for File keyboard.cpp

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// ---------------------------------------------------------------------
// This file is part of falcon-core.
//
// Copyright (C) 2015, 2016, 2017 Neuro-Electronics Research Flanders
//
// Falcon-server is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Falcon-server is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with falcon-core. If not, see <http://www.gnu.org/licenses/>.
// ---------------------------------------------------------------------

#include <signal.h>
#include <sys/select.h>
#include <termios.h>
#include <unistd.h>

#include "keyboard.hpp"

int s_interrupted = 0;

int kbhit() {
  struct timeval tv;
  fd_set fds;
  tv.tv_sec = 0;
  tv.tv_usec = 0;
  FD_ZERO(&fds);
  FD_SET(STDIN_FILENO, &fds);  // STDIN_FILENO is 0
  select(STDIN_FILENO + 1, &fds, NULL, NULL, &tv);
  return FD_ISSET(STDIN_FILENO, &fds);
}

void nonblock(int state) {
  struct termios ttystate;

  // get the terminal state
  tcgetattr(STDIN_FILENO, &ttystate);

  if (state == 1) {
    // turn off canonical mode
    ttystate.c_lflag &= ~ICANON;
    // turn off echo
    ttystate.c_lflag &= ~ECHO;
    // minimum of number input read.
    ttystate.c_cc[VMIN] = 1;
  } else if (state == 0) {
    // turn on canonical mode
    ttystate.c_lflag |= ICANON;
    // turn on echo
    ttystate.c_lflag |= ECHO;
  }
  // set the terminal attributes.
  tcsetattr(STDIN_FILENO, TCSANOW, &ttystate);
}

void s_signal_handler(int signal_value) { s_interrupted = 1; }

void s_catch_sigint_signal(void) {
  struct sigaction action;
  action.sa_handler = s_signal_handler;
  action.sa_flags = 0;
  sigemptyset(&action.sa_mask);
  sigaction(SIGINT, &action, NULL);
}