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_keysyms.h>
26 #include <X11/keysym.h>
35 static xcb_gcontext_t pixmap_gc;
36 static xcb_pixmap_t pixmap;
37 static int raised_signal;
39 static char *crash_text[] = {
41 "To debug this problem, either attach gdb now",
42 "or press 'e' to exit and get a core-dump.",
43 "If you want to keep your session,",
44 "press 'r' to restart i3 in-place."
46 static int crash_text_longest = 1;
49 * Draw the window containing the info text
52 static int sig_draw_window(xcb_connection_t *conn, xcb_window_t win, int width, int height, int font_height) {
53 /* re-draw the background */
54 xcb_rectangle_t border = { 0, 0, width, height},
55 inner = { 2, 2, width - 4, height - 4};
56 xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#FF0000"));
57 xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &border);
58 xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#000000"));
59 xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &inner);
61 /* restore font color */
62 xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#FFFFFF"));
64 for (int i = 0; i < sizeof(crash_text) / sizeof(char*); i++) {
65 int text_len = strlen(crash_text[i]);
66 char *full_text = convert_utf8_to_ucs2(crash_text[i], &text_len);
67 xcb_image_text_16(conn, text_len, pixmap, pixmap_gc, 8 /* X */,
68 3 + (i + 1) * font_height /* Y = baseline of font */,
69 (xcb_char2b_t*)full_text);
73 /* Copy the contents of the pixmap to the real window */
74 xcb_copy_area(conn, pixmap, win, pixmap_gc, 0, 0, 0, 0, width, height);
81 * Handles keypresses of 'e' or 'r' to exit or restart i3
84 static int sig_handle_key_press(void *ignored, xcb_connection_t *conn, xcb_key_press_event_t *event) {
85 uint16_t state = event->state;
87 /* Apparantly, after activating numlock once, the numlock modifier
88 * stays turned on (use xev(1) to verify). So, to resolve useful
89 * keysyms, we remove the numlock flag from the event state */
90 state &= ~xcb_numlock_mask;
92 xcb_keysym_t sym = xcb_key_press_lookup_keysym(keysyms, event, state);
95 DLOG("User issued exit-command, raising error again.\n");
107 * Opens the window we use for input/output and maps it
110 static xcb_window_t open_input_window(xcb_connection_t *conn, Rect screen_rect, uint32_t width, uint32_t height) {
111 xcb_window_t win = xcb_generate_id(conn);
116 mask |= XCB_CW_BACK_PIXEL;
119 mask |= XCB_CW_OVERRIDE_REDIRECT;
122 /* center each popup on the specified screen */
123 uint32_t x = screen_rect.x + ((screen_rect.width / 2) - (width / 2)),
124 y = screen_rect.y + ((screen_rect.height / 2) - (height / 2));
126 xcb_create_window(conn,
127 XCB_COPY_FROM_PARENT,
128 win, /* the window id */
129 root, /* parent == root */
130 x, y, width, height, /* dimensions */
131 0, /* border = 0, we draw our own */
132 XCB_WINDOW_CLASS_INPUT_OUTPUT,
133 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
137 /* Map the window (= make it visible) */
138 xcb_map_window(conn, win);
145 * It creates a window asking the user to restart in-place
146 * or exit to generate a core dump
149 void handle_signal(int sig, siginfo_t *info, void *data) {
150 DLOG("i3 crashed. SIG: %d\n", sig);
152 struct sigaction action;
153 action.sa_handler = SIG_DFL;
154 sigaction(sig, &action, NULL);
157 xcb_connection_t *conn = global_conn;
159 i3Font *font = load_font(conn, config.font);
161 /* width and height of the popup window, so that the text fits in */
162 int crash_text_num = sizeof(crash_text) / sizeof(char*);
163 int height = 13 + (crash_text_num * font->height);
165 /* calculate width for longest text */
166 int text_len = strlen(crash_text[crash_text_longest]);
167 char *longest_text = convert_utf8_to_ucs2(crash_text[crash_text_longest], &text_len);
168 int font_width = predict_text_width(conn, config.font, longest_text, text_len);
169 int width = font_width + 20;
171 /* Open a popup window on each virtual screen */
174 TAILQ_FOREACH(screen, &outputs, outputs) {
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 /* Grab the cursor inside the popup */
192 xcb_grab_pointer(conn, false, win, XCB_NONE, XCB_GRAB_MODE_ASYNC,
193 XCB_GRAB_MODE_ASYNC, win, XCB_NONE, XCB_CURRENT_TIME);
195 sig_draw_window(conn, win, width, height, font->height);
199 xcb_generic_event_t *event;
200 /* Yay, more own eventhandlers… */
201 while ((event = xcb_wait_for_event(conn))) {
202 /* Strip off the highest bit (set if the event is generated) */
203 int type = (event->response_type & 0x7F);
204 if (type == XCB_KEY_PRESS) {
205 sig_handle_key_press(NULL, conn, (xcb_key_press_event_t*)event);
212 * Setup signal handlers to safely handle SIGSEGV and SIGFPE
215 void setup_signal_handler() {
216 struct sigaction action;
218 action.sa_sigaction = handle_signal;
219 action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
220 sigemptyset(&action.sa_mask);
222 if (sigaction(SIGSEGV, &action, NULL) == -1 ||
223 sigaction(SIGFPE, &action, NULL) == -1)
224 ELOG("Could not setup signal handler");