mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-11-08 22:45:43 +01:00
f282607273
When we get a notification that an element has been removed, we have to recreate our internal control representation to avoid accessing freed memory. (And the checking for SND_CTL_EVENT_MASK_REMOVE should actually be done correctly while we're at it.) Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*
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* mainloop.c - main loop
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* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "aconfig.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <poll.h>
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#include <panel.h>
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#include <alsa/asoundlib.h>
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#include "mem.h"
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#include "die.h"
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#include "colors.h"
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#include "widget.h"
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#include "mixer_widget.h"
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#include "mixer_display.h"
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#include "mainloop.h"
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static WINDOW *curses_initialized;
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static void black_hole_error_handler(const char *file, int line,
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const char *function, int err,
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const char *fmt, ...)
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{
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}
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void initialize_curses(bool use_color)
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{
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curses_initialized = initscr();
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cbreak();
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noecho();
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#ifdef HAVE_CURSES_ESCDELAY
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set_escdelay(100);
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#endif
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window_size_changed(); /* update screen_lines/cols */
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init_colors(use_color);
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snd_lib_error_set_handler(black_hole_error_handler);
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}
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void app_shutdown(void)
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{
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if (curses_initialized) {
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clear();
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refresh();
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curs_set(1);
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endwin();
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}
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mixer_shutdown();
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}
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void mainloop(void)
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{
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struct pollfd *pollfds = NULL;
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int nfds = 0, n;
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struct widget *active_widget;
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unsigned short revents;
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int key;
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int err;
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for (;;) {
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update_panels();
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doupdate();
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active_widget = get_active_widget();
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if (!active_widget)
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break;
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n = 1 + snd_mixer_poll_descriptors_count(mixer);
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if (n != nfds) {
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free(pollfds);
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nfds = n;
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pollfds = ccalloc(nfds, sizeof *pollfds);
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pollfds[0].fd = fileno(stdin);
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pollfds[0].events = POLLIN;
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}
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err = snd_mixer_poll_descriptors(mixer, &pollfds[1], nfds - 1);
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if (err < 0)
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fatal_alsa_error("cannot get poll descriptors", err);
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n = poll(pollfds, nfds, -1);
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if (n < 0) {
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if (errno == EINTR) {
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pollfds[0].revents = 0;
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doupdate(); /* handle SIGWINCH */
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} else {
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fatal_error("poll error");
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}
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}
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if (pollfds[0].revents & (POLLERR | POLLHUP | POLLNVAL))
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break;
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if (pollfds[0].revents & POLLIN)
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--n;
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if (n > 0) {
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err = snd_mixer_poll_descriptors_revents(mixer, &pollfds[1], nfds - 1, &revents);
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if (err < 0)
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fatal_alsa_error("cannot get poll events", err);
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if (revents & (POLLERR | POLLNVAL))
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close_mixer_device();
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else if (revents & POLLIN)
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snd_mixer_handle_events(mixer);
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}
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key = wgetch(active_widget->window);
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while (key != ERR) {
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#ifdef KEY_RESIZE
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if (key == KEY_RESIZE)
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window_size_changed();
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else
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#endif
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active_widget->handle_key(key);
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active_widget = get_active_widget();
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if (!active_widget)
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break;
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key = wgetch(active_widget->window);
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}
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if (!active_widget)
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break;
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if (controls_changed) {
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controls_changed = FALSE;
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create_controls();
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control_values_changed = FALSE;
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display_controls();
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} else if (control_values_changed) {
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control_values_changed = FALSE;
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display_controls();
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}
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}
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free(pollfds);
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}
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