4 * i3 - an improved dynamic tiling window manager
6 * © 2009-2010 Michael Stapelberg and contributors
7 * © 2009-2010 Jan-Erik Rediger
9 * See file LICENSE for license information.
11 * sighandler.c: contains all functions for signal handling
23 #include <xcb/xcb_aux.h>
24 #include <xcb/xcb_event.h>
25 #include <xcb/xcb_keysyms.h>
27 #include <X11/keysym.h>
36 static xcb_gcontext_t pixmap_gc;
37 static xcb_pixmap_t pixmap;
38 static int raised_signal;
40 static char *crash_text[] = {
42 "To debug this problem, either attach gdb now",
43 "or press 'e' to exit and get a core-dump.",
44 "If you want to keep your session,",
45 "press 'r' to restart i3 in-place."
47 static int crash_text_longest = 1;
50 * Draw the window containing the info text
53 static int sig_draw_window(xcb_connection_t *conn, xcb_window_t win, int width, int height, int font_height) {
54 /* re-draw the background */
55 xcb_rectangle_t border = { 0, 0, width, height},
56 inner = { 2, 2, width - 4, height - 4};
57 xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#FF0000"));
58 xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &border);
59 xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#000000"));
60 xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &inner);
62 /* restore font color */
63 xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#FFFFFF"));
65 for (int i = 0; i < sizeof(crash_text) / sizeof(char*); i++) {
66 int text_len = strlen(crash_text[i]);
67 char *full_text = convert_utf8_to_ucs2(crash_text[i], &text_len);
68 xcb_image_text_16(conn, text_len, pixmap, pixmap_gc, 8 /* X */,
69 3 + (i + 1) * font_height /* Y = baseline of font */,
70 (xcb_char2b_t*)full_text);
74 /* Copy the contents of the pixmap to the real window */
75 xcb_copy_area(conn, pixmap, win, pixmap_gc, 0, 0, 0, 0, width, height);
83 * Handles keypresses of 'e' or 'r' to exit or restart i3
86 static int sig_handle_key_press(void *ignored, xcb_connection_t *conn, xcb_key_press_event_t *event) {
87 xcb_keysym_t sym = xcb_key_press_lookup_keysym(keysyms, event, event->state);
90 DLOG("User issued exit-command, raising error again.\n");
102 * Opens the window we use for input/output and maps it
105 static xcb_window_t open_input_window(xcb_connection_t *conn, Rect screen_rect, uint32_t width, uint32_t height) {
106 xcb_window_t root = xcb_setup_roots_iterator(xcb_get_setup(conn)).data->root;
107 xcb_window_t win = xcb_generate_id(conn);
112 mask |= XCB_CW_BACK_PIXEL;
115 mask |= XCB_CW_OVERRIDE_REDIRECT;
118 /* center each popup on the specified screen */
119 uint32_t x = screen_rect.x + ((screen_rect.width / 2) - (width/2)),
120 y = screen_rect.y + ((screen_rect.height / 2) - (height/2));
122 xcb_create_window(conn,
123 XCB_COPY_FROM_PARENT,
124 win, /* the window id */
125 root, /* parent == root */
126 x, y, width, height, /* dimensions */
127 0, /* border = 0, we draw our own */
128 XCB_WINDOW_CLASS_INPUT_OUTPUT,
129 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
133 /* Map the window (= make it visible) */
134 xcb_map_window(conn, win);
141 * It creates a window asking the user to restart in-place
142 * or exit to generate a core dump
145 void handle_signal(int sig, siginfo_t *info, void *data) {
146 DLOG("i3 crashed. SIG: %d\n", sig);
148 struct sigaction action;
149 action.sa_handler = SIG_DFL;
150 sigaction(sig, &action, NULL);
153 xcb_connection_t *conn = global_conn;
155 /* setup event handler for key presses */
156 xcb_event_handlers_t sig_evenths;
157 memset(&sig_evenths, 0, sizeof(xcb_event_handlers_t));
158 xcb_event_handlers_init(conn, &sig_evenths);
159 xcb_event_set_key_press_handler(&sig_evenths, sig_handle_key_press, NULL);
161 i3Font *font = load_font(conn, config.font);
163 /* width and height of the popup window, so that the text fits in */
164 int crash_text_num = sizeof(crash_text) / sizeof(char*);
165 int height = 13 + (crash_text_num * font->height);
167 /* calculate width for longest text */
168 int text_len = strlen(crash_text[crash_text_longest]);
169 char *longest_text = convert_utf8_to_ucs2(crash_text[crash_text_longest], &text_len);
170 int font_width = predict_text_width(conn, config.font, longest_text, text_len);
171 int width = font_width + 20;
173 /* Open a popup window on each virtual screen */
176 TAILQ_FOREACH(screen, virtual_screens, screens) {
177 win = open_input_window(conn, screen->rect, width, height);
180 pixmap = xcb_generate_id(conn);
181 pixmap_gc = xcb_generate_id(conn);
182 xcb_create_pixmap(conn, root_depth, pixmap, win, width, height);
183 xcb_create_gc(conn, pixmap_gc, pixmap, 0, 0);
185 /* Create graphics context */
186 xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FONT, font->id);
188 /* Grab the keyboard to get all input */
189 xcb_grab_keyboard(conn, false, win, XCB_CURRENT_TIME, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
191 sig_draw_window(conn, win, width, height, font->height);
195 xcb_event_wait_for_event_loop(&sig_evenths);
199 * Setup signal handlers to safely handle SIGSEGV and SIGFPE
202 void setup_signal_handler() {
203 struct sigaction action;
205 action.sa_sigaction = handle_signal;
206 action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
207 sigemptyset(&action.sa_mask);
209 if (sigaction(SIGSEGV, &action, NULL) == -1 ||
210 sigaction(SIGFPE, &action, NULL) == -1)
211 ELOG("Could not setup signal handler");