mainloop.c (3469B)
1 /* 2 * mainloop.c - main loop 3 * Copyright (c) Clemens Ladisch <clemens@ladisch.de> 4 * 5 * This program is free software: you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation, either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "aconfig.h" 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <errno.h> 23 #include <poll.h> 24 #include <panel.h> 25 #include <alsa/asoundlib.h> 26 #include "mem.h" 27 #include "die.h" 28 #include "colors.h" 29 #include "widget.h" 30 #include "mixer_widget.h" 31 #include "mixer_display.h" 32 #include "mixer_controls.h" 33 #include "mainloop.h" 34 35 static WINDOW *curses_initialized; 36 37 static void black_hole_error_handler(const char *file, int line, 38 const char *function, int err, 39 const char *fmt, ...) 40 { 41 } 42 43 void initialize_curses(bool use_color) 44 { 45 curses_initialized = initscr(); 46 cbreak(); 47 noecho(); 48 #ifdef HAVE_CURSES_ESCDELAY 49 set_escdelay(100); 50 #endif 51 window_size_changed(); /* update screen_lines/cols */ 52 init_colors(use_color); 53 snd_lib_error_set_handler(black_hole_error_handler); 54 } 55 56 void app_shutdown(void) 57 { 58 if (curses_initialized) { 59 clear(); 60 refresh(); 61 curs_set(1); 62 endwin(); 63 } 64 mixer_shutdown(); 65 } 66 67 void mainloop(void) 68 { 69 struct pollfd *pollfds = NULL; 70 int nfds = 0, n; 71 struct widget *active_widget; 72 unsigned short revents; 73 int key; 74 int err; 75 76 for (;;) { 77 update_panels(); 78 doupdate(); 79 80 active_widget = get_active_widget(); 81 if (!active_widget) 82 break; 83 84 n = 1 + snd_mixer_poll_descriptors_count(mixer); 85 if (n != nfds) { 86 free(pollfds); 87 nfds = n; 88 pollfds = ccalloc(nfds, sizeof *pollfds); 89 pollfds[0].fd = fileno(stdin); 90 pollfds[0].events = POLLIN; 91 } 92 err = snd_mixer_poll_descriptors(mixer, &pollfds[1], nfds - 1); 93 if (err < 0) 94 fatal_alsa_error("cannot get poll descriptors", err); 95 n = poll(pollfds, nfds, -1); 96 if (n < 0) { 97 if (errno == EINTR) { 98 pollfds[0].revents = 0; 99 doupdate(); /* handle SIGWINCH */ 100 } else { 101 fatal_error("poll error"); 102 } 103 } 104 if (pollfds[0].revents & (POLLERR | POLLHUP | POLLNVAL)) 105 break; 106 if (pollfds[0].revents & POLLIN) 107 --n; 108 if (n > 0) { 109 err = snd_mixer_poll_descriptors_revents(mixer, &pollfds[1], nfds - 1, &revents); 110 if (err < 0) 111 fatal_alsa_error("cannot get poll events", err); 112 if (revents & (POLLERR | POLLNVAL)) 113 close_mixer_device(); 114 else if (revents & POLLIN) 115 snd_mixer_handle_events(mixer); 116 } 117 key = wgetch(active_widget->window); 118 while (key != ERR) { 119 #ifdef KEY_RESIZE 120 if (key == KEY_RESIZE) 121 window_size_changed(); 122 else 123 #endif 124 active_widget->handle_key(key); 125 active_widget = get_active_widget(); 126 if (!active_widget) 127 break; 128 key = wgetch(active_widget->window); 129 } 130 if (!active_widget) 131 break; 132 if (controls_changed) { 133 controls_changed = FALSE; 134 create_controls(); 135 control_values_changed = FALSE; 136 display_controls(); 137 } else if (control_values_changed) { 138 control_values_changed = FALSE; 139 display_controls(); 140 } 141 } 142 free(pollfds); 143 }