Merge pull request #2624 from Airblader/bug-2422
Rewrite the signal handler dialogs.
This commit is contained in:
Michael Stapelberg
GitHub
commit
4137849ea2
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@ -3,10 +3,6 @@
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*
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* i3 - an improved dynamic tiling window manager
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* © 2009 Michael Stapelberg and contributors (see also: LICENSE)
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* © 2009 Jan-Erik Rediger
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*
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* sighandler.c: Interactive crash dialog upon SIGSEGV/SIGABRT/SIGFPE (offers
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* to restart inplace).
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*
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*/
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#pragma once
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@ -14,7 +10,8 @@
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#include <config.h>
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/**
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* Setup signal handlers to safely handle SIGSEGV and SIGFPE
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* Configured a signal handler to gracefully handle crashes and allow the user
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* to generate a backtrace and rescue their session.
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*
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*/
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void setup_signal_handler(void);
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343
src/sighandler.c
343
src/sighandler.c
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@ -3,10 +3,6 @@
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*
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* i3 - an improved dynamic tiling window manager
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* © 2009 Michael Stapelberg and contributors (see also: LICENSE)
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* © 2009 Jan-Erik Rediger
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*
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* sighandler.c: Interactive crash dialog upon SIGSEGV/SIGABRT/SIGFPE (offers
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* to restart inplace).
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*
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*/
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#include "all.h"
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@ -20,28 +16,44 @@
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#include <X11/keysym.h>
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static void open_popups(void);
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typedef struct dialog_t {
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xcb_window_t id;
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xcb_colormap_t colormap;
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Rect dims;
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surface_t surface;
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static xcb_gcontext_t pixmap_gc;
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static xcb_pixmap_t pixmap;
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TAILQ_ENTRY(dialog_t)
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dialogs;
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} dialog_t;
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static TAILQ_HEAD(dialogs_head, dialog_t) dialogs = TAILQ_HEAD_INITIALIZER(dialogs);
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static int raised_signal;
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static char *crash_text[] = {
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"i3 just crashed.",
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"To debug this problem, either attach gdb now",
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"or press",
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"- 'b' to save a backtrace (needs GDB),",
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"- 'r' to restart i3 in-place or",
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"- 'f' to forget the current layout and restart"};
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static int crash_text_longest = 5;
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static int backtrace_string_index = 3;
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static int backtrace_done = 0;
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static int sighandler_backtrace(void);
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static void sighandler_setup(void);
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static void sighandler_create_dialogs(void);
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static void sighandler_destroy_dialogs(void);
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static void sighandler_handle_expose(void);
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static void sighandler_draw_dialog(dialog_t *dialog);
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static void sighandler_handle_key_press(xcb_key_press_event_t *event);
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static i3String *message_intro;
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static i3String *message_intro2;
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static i3String *message_option_backtrace;
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static i3String *message_option_restart;
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static i3String *message_option_forget;
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static int dialog_width;
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static int dialog_height;
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static int border_width = 2;
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static int margin = 4;
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/*
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* Attach gdb to pid_parent and dump a backtrace to i3-backtrace.$pid in the
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* tmpdir
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*/
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static int backtrace(void) {
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static int sighandler_backtrace(void) {
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char *tmpdir = getenv("TMPDIR");
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if (tmpdir == NULL)
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tmpdir = "/tmp";
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@ -125,53 +137,144 @@ static int backtrace(void) {
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return 1;
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}
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/*
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* Draw the window containing the info text
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*
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*/
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static int sig_draw_window(xcb_window_t win, int width, int height, int font_height, i3String **crash_text_i3strings) {
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/* re-draw the background */
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xcb_rectangle_t border = {0, 0, width, height},
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inner = {2, 2, width - 4, height - 4};
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xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND, (uint32_t[]){get_colorpixel("#FF0000")});
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xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &border);
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xcb_change_gc(conn, pixmap_gc, XCB_GC_FOREGROUND, (uint32_t[]){get_colorpixel("#000000")});
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xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &inner);
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static void sighandler_setup(void) {
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border_width = logical_px(border_width);
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margin = logical_px(margin);
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/* restore font color */
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set_font_colors(pixmap_gc, draw_util_hex_to_color("#FFFFFF"), draw_util_hex_to_color("#000000"));
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int num_lines = 5;
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message_intro = i3string_from_utf8("i3 has just crashed. Please report a bug for this.");
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message_intro2 = i3string_from_utf8("To debug this problem, you can either attach gdb or choose from the following options:");
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message_option_backtrace = i3string_from_utf8("- 'b' to save a backtrace (requires gdb)");
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message_option_restart = i3string_from_utf8("- 'r' to restart i3 in-place");
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message_option_forget = i3string_from_utf8("- 'f' to forget the previous layout and restart i3");
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char *bt_colour = "#FFFFFF";
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if (backtrace_done < 0)
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bt_colour = "#AA0000";
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else if (backtrace_done > 0)
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bt_colour = "#00AA00";
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int width_longest_message = predict_text_width(message_intro2);
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for (int i = 0; crash_text_i3strings[i] != NULL; ++i) {
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/* fix the colour for the backtrace line when it finished */
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if (i == backtrace_string_index)
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set_font_colors(pixmap_gc, draw_util_hex_to_color(bt_colour), draw_util_hex_to_color("#000000"));
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draw_text(crash_text_i3strings[i], pixmap, pixmap_gc, NULL,
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8, 5 + i * font_height, width - 16);
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/* and reset the colour again for other lines */
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if (i == backtrace_string_index)
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set_font_colors(pixmap_gc, draw_util_hex_to_color("#FFFFFF"), draw_util_hex_to_color("#000000"));
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}
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/* Copy the contents of the pixmap to the real window */
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xcb_copy_area(conn, pixmap, win, pixmap_gc, 0, 0, 0, 0, width, height);
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xcb_flush(conn);
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return 1;
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dialog_width = width_longest_message + 2 * border_width + 2 * margin;
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dialog_height = num_lines * config.font.height + 2 * border_width + 2 * margin;
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}
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/*
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* Handles keypresses of 'b', 'r' and 'f' to get a backtrace or restart i3
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*
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*/
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static int sig_handle_key_press(void *ignored, xcb_connection_t *conn, xcb_key_press_event_t *event) {
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static void sighandler_create_dialogs(void) {
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Output *output;
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TAILQ_FOREACH(output, &outputs, outputs) {
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if (!output->active) {
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continue;
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}
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dialog_t *dialog = scalloc(1, sizeof(struct dialog_t));
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TAILQ_INSERT_TAIL(&dialogs, dialog, dialogs);
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xcb_visualid_t visual = get_visualid_by_depth(root_depth);
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dialog->colormap = xcb_generate_id(conn);
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xcb_create_colormap(conn, XCB_COLORMAP_ALLOC_NONE, dialog->colormap, root, visual);
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uint32_t mask = 0;
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uint32_t values[4];
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int i = 0;
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/* Needs to be set in the case of a 32-bit root depth. */
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mask |= XCB_CW_BACK_PIXEL;
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values[i++] = root_screen->black_pixel;
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/* Needs to be set in the case of a 32-bit root depth. */
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mask |= XCB_CW_BORDER_PIXEL;
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values[i++] = root_screen->black_pixel;
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mask |= XCB_CW_OVERRIDE_REDIRECT;
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values[i++] = 1;
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/* Needs to be set in the case of a 32-bit root depth. */
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mask |= XCB_CW_COLORMAP;
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values[i++] = dialog->colormap;
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dialog->dims.x = output->rect.x + (output->rect.width / 2);
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dialog->dims.y = output->rect.y + (output->rect.height / 2);
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dialog->dims.width = dialog_width;
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dialog->dims.height = dialog_height;
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/* Make sure the dialog is centered. */
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dialog->dims.x -= dialog->dims.width / 2;
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dialog->dims.y -= dialog->dims.height / 2;
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dialog->id = create_window(conn, dialog->dims, root_depth, visual,
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XCB_WINDOW_CLASS_INPUT_OUTPUT, XCURSOR_CURSOR_POINTER,
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true, mask, values);
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draw_util_surface_init(conn, &(dialog->surface), dialog->id, get_visualtype_by_id(visual),
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dialog->dims.width, dialog->dims.height);
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xcb_grab_keyboard(conn, false, dialog->id, XCB_CURRENT_TIME, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
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/* Confine the pointer to the crash dialog. */
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xcb_grab_pointer(conn, false, dialog->id, XCB_NONE, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC, dialog->id,
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XCB_NONE, XCB_CURRENT_TIME);
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}
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sighandler_handle_expose();
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xcb_flush(conn);
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}
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static void sighandler_destroy_dialogs(void) {
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while (!TAILQ_EMPTY(&dialogs)) {
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dialog_t *dialog = TAILQ_FIRST(&dialogs);
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xcb_free_colormap(conn, dialog->colormap);
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draw_util_surface_free(conn, &(dialog->surface));
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xcb_destroy_window(conn, dialog->id);
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TAILQ_REMOVE(&dialogs, dialog, dialogs);
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free(dialog);
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}
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xcb_flush(conn);
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}
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static void sighandler_handle_expose(void) {
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dialog_t *current;
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TAILQ_FOREACH(current, &dialogs, dialogs) {
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sighandler_draw_dialog(current);
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}
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xcb_flush(conn);
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}
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static void sighandler_draw_dialog(dialog_t *dialog) {
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const color_t black = draw_util_hex_to_color("#000000");
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const color_t white = draw_util_hex_to_color("#FFFFFF");
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const color_t red = draw_util_hex_to_color("#FF0000");
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/* Start with a clean slate and draw a red border. */
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draw_util_clear_surface(conn, &(dialog->surface), red);
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draw_util_rectangle(conn, &(dialog->surface), black, border_width, border_width,
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dialog->dims.width - 2 * border_width, dialog->dims.height - 2 * border_width);
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int y = border_width + margin;
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const int x = border_width + margin;
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const int max_width = dialog->dims.width - 2 * x;
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draw_util_text(message_intro, &(dialog->surface), white, black, x, y, max_width);
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y += config.font.height;
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draw_util_text(message_intro2, &(dialog->surface), white, black, x, y, max_width);
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y += config.font.height;
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char *bt_color = "#FFFFFF";
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if (backtrace_done < 0) {
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bt_color = "#AA0000";
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} else if (backtrace_done > 0) {
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bt_color = "#00AA00";
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}
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draw_util_text(message_option_backtrace, &(dialog->surface), draw_util_hex_to_color(bt_color), black, x, y, max_width);
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y += config.font.height;
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draw_util_text(message_option_restart, &(dialog->surface), white, black, x, y, max_width);
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y += config.font.height;
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draw_util_text(message_option_forget, &(dialog->surface), white, black, x, y, max_width);
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y += config.font.height;
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}
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static void sighandler_handle_key_press(xcb_key_press_event_t *event) {
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uint16_t state = event->state;
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/* Apparently, after activating numlock once, the numlock modifier
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@ -186,106 +289,17 @@ static int sig_handle_key_press(void *ignored, xcb_connection_t *conn, xcb_key_p
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/* fork and exec/attach GDB to the parent to get a backtrace in the
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* tmpdir */
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backtrace_done = backtrace();
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/* re-open the windows to indicate that it's finished */
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open_popups();
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}
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if (sym == 'r')
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backtrace_done = sighandler_backtrace();
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sighandler_handle_expose();
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} else if (sym == 'r') {
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sighandler_destroy_dialogs();
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i3_restart(false);
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if (sym == 'f')
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} else if (sym == 'f') {
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sighandler_destroy_dialogs();
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i3_restart(true);
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return 1;
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}
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/*
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* Opens the window we use for input/output and maps it
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*
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*/
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static xcb_window_t open_input_window(xcb_connection_t *conn, Rect screen_rect, uint32_t width, uint32_t height) {
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xcb_window_t win = xcb_generate_id(conn);
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uint32_t mask = 0;
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uint32_t values[2];
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mask |= XCB_CW_BACK_PIXEL;
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values[0] = 0;
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mask |= XCB_CW_OVERRIDE_REDIRECT;
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values[1] = 1;
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/* center each popup on the specified screen */
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uint32_t x = screen_rect.x + ((screen_rect.width / 2) - (width / 2)),
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y = screen_rect.y + ((screen_rect.height / 2) - (height / 2));
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xcb_create_window(conn,
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XCB_COPY_FROM_PARENT,
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win, /* the window id */
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root, /* parent == root */
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x, y, width, height, /* dimensions */
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0, /* border = 0, we draw our own */
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XCB_WINDOW_CLASS_INPUT_OUTPUT,
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XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
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mask,
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values);
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/* Map the window (= make it visible) */
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xcb_map_window(conn, win);
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return win;
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}
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static void open_popups() {
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/* width and height of the popup window, so that the text fits in */
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int crash_text_num = sizeof(crash_text) / sizeof(char *);
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int height = 13 + (crash_text_num * config.font.height);
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int crash_text_length = sizeof(crash_text) / sizeof(char *);
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i3String **crash_text_i3strings = smalloc(sizeof(i3String *) * (crash_text_length + 1));
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/* Pre-compute i3Strings for our text */
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for (int i = 0; i < crash_text_length; ++i) {
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crash_text_i3strings[i] = i3string_from_utf8(crash_text[i]);
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}
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crash_text_i3strings[crash_text_length] = NULL;
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/* calculate width for longest text */
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int font_width = predict_text_width(crash_text_i3strings[crash_text_longest]);
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int width = font_width + 20;
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/* Open a popup window on each virtual screen */
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Output *screen;
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xcb_window_t win;
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TAILQ_FOREACH(screen, &outputs, outputs) {
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if (!screen->active)
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continue;
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win = open_input_window(conn, screen->rect, width, height);
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/* Create pixmap */
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pixmap = xcb_generate_id(conn);
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pixmap_gc = xcb_generate_id(conn);
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xcb_create_pixmap(conn, root_depth, pixmap, win, width, height);
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xcb_create_gc(conn, pixmap_gc, pixmap, 0, 0);
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/* Grab the keyboard to get all input */
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xcb_grab_keyboard(conn, false, win, XCB_CURRENT_TIME, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
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/* Grab the cursor inside the popup */
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xcb_grab_pointer(conn, false, win, XCB_NONE, XCB_GRAB_MODE_ASYNC,
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XCB_GRAB_MODE_ASYNC, win, XCB_NONE, XCB_CURRENT_TIME);
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sig_draw_window(win, width, height, config.font.height, crash_text_i3strings);
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xcb_flush(conn);
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}
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}
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/*
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* Handle signals
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* It creates a window asking the user to restart in-place
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* or exit to generate a core dump
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*
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*/
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void handle_signal(int sig, siginfo_t *info, void *data) {
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DLOG("i3 crashed. SIG: %d\n", sig);
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@ -294,22 +308,33 @@ void handle_signal(int sig, siginfo_t *info, void *data) {
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sigaction(sig, &action, NULL);
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raised_signal = sig;
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open_popups();
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sighandler_setup();
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sighandler_create_dialogs();
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xcb_generic_event_t *event;
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/* Yay, more own eventhandlers… */
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while ((event = xcb_wait_for_event(conn))) {
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/* Strip off the highest bit (set if the event is generated) */
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int type = (event->response_type & 0x7F);
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if (type == XCB_KEY_PRESS) {
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sig_handle_key_press(NULL, conn, (xcb_key_press_event_t *)event);
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switch (type) {
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case XCB_KEY_PRESS:
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sighandler_handle_key_press((xcb_key_press_event_t *)event);
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break;
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case XCB_EXPOSE:
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if (((xcb_expose_event_t *)event)->count == 0) {
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sighandler_handle_expose();
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}
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break;
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}
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free(event);
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}
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}
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|
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/*
|
||||
* Setup signal handlers to safely handle SIGSEGV and SIGFPE
|
||||
* Configured a signal handler to gracefully handle crashes and allow the user
|
||||
* to generate a backtrace and rescue their session.
|
||||
*
|
||||
*/
|
||||
void setup_signal_handler(void) {
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Reference in New Issue