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mainloop.c

/*
 * mainloop.c - main loop
 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "aconfig.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <poll.h>
#include <panel.h>
#include <alsa/asoundlib.h>
#include "mem.h"
#include "die.h"
#include "colors.h"
#include "widget.h"
#include "mixer_widget.h"
#include "mixer_display.h"
#include "mainloop.h"

static WINDOW *curses_initialized;

static void black_hole_error_handler(const char *file, int line,
                             const char *function, int err,
                             const char *fmt, ...)
{
}

void initialize_curses(bool use_color)
{
      curses_initialized = initscr();
      cbreak();
      noecho();
#ifdef HAVE_CURSES_ESCDELAY
      set_escdelay(100);
#endif
      window_size_changed(); /* update screen_lines/cols */
      init_colors(use_color);
      snd_lib_error_set_handler(black_hole_error_handler);
}

void shutdown(void)
{
      if (curses_initialized) {
            clear();
            refresh();
            curs_set(1);
            endwin();
      }
      mixer_shutdown();
}

void mainloop(void)
{
      struct pollfd *pollfds = NULL;
      int nfds = 0, n;
      struct widget *active_widget;
      unsigned short revents;
      int key;
      int err;

      for (;;) {
            update_panels();
            doupdate();

            active_widget = get_active_widget();
            if (!active_widget)
                  break;

            n = 1 + snd_mixer_poll_descriptors_count(mixer);
            if (n != nfds) {
                  free(pollfds);
                  nfds = n;
                  pollfds = ccalloc(nfds, sizeof *pollfds);
                  pollfds[0].fd = fileno(stdin);
                  pollfds[0].events = POLLIN;
            }
            err = snd_mixer_poll_descriptors(mixer, &pollfds[1], nfds - 1);
            if (err < 0)
                  fatal_alsa_error("cannot get poll descriptors", err);
            n = poll(pollfds, nfds, -1);
            if (n < 0) {
                  if (errno == EINTR) {
                        pollfds[0].revents = 0;
                        doupdate(); /* handle SIGWINCH */
                  } else {
                        fatal_error("poll error");
                  }
            }
            if (pollfds[0].revents & (POLLERR | POLLHUP | POLLNVAL))
                  break;
            if (pollfds[0].revents & POLLIN)
                  --n;
            if (n > 0) {
                  err = snd_mixer_poll_descriptors_revents(mixer, &pollfds[1], nfds - 1, &revents);
                  if (err < 0)
                        fatal_alsa_error("cannot get poll events", err);
                  if (revents & (POLLERR | POLLNVAL))
                        close_mixer_device();
                  else if (revents & POLLIN)
                        snd_mixer_handle_events(mixer);
            }
            key = wgetch(active_widget->window);
            while (key != ERR) {
#ifdef KEY_RESIZE
                  if (key == KEY_RESIZE)
                        window_size_changed();
                  else
#endif
                        active_widget->handle_key(key);
                  active_widget = get_active_widget();
                  if (!active_widget)
                        break;
                  key = wgetch(active_widget->window);
            }
            if (!active_widget)
                  break;
            if (controls_changed)
                  display_controls();
      }
      free(pollfds);
}

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