/* * vim:ts=4:sw=4:expandtab * * i3 - an improved dynamic tiling window manager * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE) * © 2009-2010 Jan-Erik Rediger * * sighandler.c: Interactive crash dialog upon SIGSEGV/SIGABRT/SIGFPE (offers * to restart inplace). * */ #include "all.h" #include #include #include #include #include static xcb_gcontext_t pixmap_gc; static xcb_pixmap_t pixmap; static int raised_signal; static char *crash_text[] = { "i3 just crashed.", "To debug this problem, either attach gdb now", "or press", "- 'e' to exit and get a core-dump,", "- 'r' to restart i3 in-place or", "- 'f' to forget the current layout and restart" }; static int crash_text_longest = 5; /* * Draw the window containing the info text * */ static int sig_draw_window(xcb_window_t win, int width, int height, int font_height) { /* re-draw the background */ xcb_rectangle_t border = { 0, 0, width, height}, inner = { 2, 2, width - 4, height - 4}; xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND, (uint32_t[]){ get_colorpixel("#FF0000") }); xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &border); xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND, (uint32_t[]){ get_colorpixel("#000000") }); xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &inner); /* restore font color */ set_font_colors(pixmap_gc, get_colorpixel("#FFFFFF"), get_colorpixel("#000000")); for (int i = 0; i < sizeof(crash_text) / sizeof(char*); i++) { draw_text(crash_text[i], strlen(crash_text[i]), false, pixmap, pixmap_gc, 8, 3 + (i - 1) * font_height, width - 16); } /* Copy the contents of the pixmap to the real window */ xcb_copy_area(conn, pixmap, win, pixmap_gc, 0, 0, 0, 0, width, height); xcb_flush(conn); return 1; } /* * Handles keypresses of 'e' or 'r' to exit or restart i3 * */ static int sig_handle_key_press(void *ignored, xcb_connection_t *conn, xcb_key_press_event_t *event) { uint16_t state = event->state; /* Apparantly, after activating numlock once, the numlock modifier * stays turned on (use xev(1) to verify). So, to resolve useful * keysyms, we remove the numlock flag from the event state */ state &= ~xcb_numlock_mask; xcb_keysym_t sym = xcb_key_press_lookup_keysym(keysyms, event, state); if (sym == 'e') { DLOG("User issued exit-command, raising error again.\n"); raise(raised_signal); exit(1); } if (sym == 'r') i3_restart(false); if (sym == 'f') i3_restart(true); return 1; } /* * Opens the window we use for input/output and maps it * */ static xcb_window_t open_input_window(xcb_connection_t *conn, Rect screen_rect, uint32_t width, uint32_t height) { xcb_window_t win = xcb_generate_id(conn); uint32_t mask = 0; uint32_t values[2]; mask |= XCB_CW_BACK_PIXEL; values[0] = 0; mask |= XCB_CW_OVERRIDE_REDIRECT; values[1] = 1; /* center each popup on the specified screen */ uint32_t x = screen_rect.x + ((screen_rect.width / 2) - (width / 2)), y = screen_rect.y + ((screen_rect.height / 2) - (height / 2)); xcb_create_window(conn, XCB_COPY_FROM_PARENT, win, /* the window id */ root, /* parent == root */ x, y, width, height, /* dimensions */ 0, /* border = 0, we draw our own */ XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */ mask, values); /* Map the window (= make it visible) */ xcb_map_window(conn, win); return win; } /* * Handle signals * It creates a window asking the user to restart in-place * or exit to generate a core dump * */ void handle_signal(int sig, siginfo_t *info, void *data) { DLOG("i3 crashed. SIG: %d\n", sig); struct sigaction action; action.sa_handler = SIG_DFL; sigaction(sig, &action, NULL); raised_signal = sig; /* width and height of the popup window, so that the text fits in */ int crash_text_num = sizeof(crash_text) / sizeof(char*); int height = 13 + (crash_text_num * config.font.height); /* calculate width for longest text */ size_t text_len = strlen(crash_text[crash_text_longest]); xcb_char2b_t *longest_text = convert_utf8_to_ucs2(crash_text[crash_text_longest], &text_len); int font_width = predict_text_width((char *)longest_text, text_len, true); int width = font_width + 20; /* Open a popup window on each virtual screen */ Output *screen; xcb_window_t win; TAILQ_FOREACH(screen, &outputs, outputs) { if (!screen->active) continue; win = open_input_window(conn, screen->rect, width, height); /* Create pixmap */ pixmap = xcb_generate_id(conn); pixmap_gc = xcb_generate_id(conn); xcb_create_pixmap(conn, root_depth, pixmap, win, width, height); xcb_create_gc(conn, pixmap_gc, pixmap, 0, 0); /* Grab the keyboard to get all input */ xcb_grab_keyboard(conn, false, win, XCB_CURRENT_TIME, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC); /* Grab the cursor inside the popup */ xcb_grab_pointer(conn, false, win, XCB_NONE, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC, win, XCB_NONE, XCB_CURRENT_TIME); sig_draw_window(win, width, height, config.font.height); xcb_flush(conn); } xcb_generic_event_t *event; /* Yay, more own eventhandlers… */ while ((event = xcb_wait_for_event(conn))) { /* Strip off the highest bit (set if the event is generated) */ int type = (event->response_type & 0x7F); if (type == XCB_KEY_PRESS) { sig_handle_key_press(NULL, conn, (xcb_key_press_event_t*)event); } free(event); } } /* * Setup signal handlers to safely handle SIGSEGV and SIGFPE * */ void setup_signal_handler() { struct sigaction action; action.sa_sigaction = handle_signal; action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO; sigemptyset(&action.sa_mask); /* Catch all signals with default action "Core", see signal(7) */ if (sigaction(SIGQUIT, &action, NULL) == -1 || sigaction(SIGILL, &action, NULL) == -1 || sigaction(SIGABRT, &action, NULL) == -1 || sigaction(SIGFPE, &action, NULL) == -1 || sigaction(SIGSEGV, &action, NULL) == -1) ELOG("Could not setup signal handler"); }