/*
- * vim:ts=8:expandtab
+ * vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
- *
- * © 2009-2010 Michael Stapelberg and contributors
- * © 2009-2010 Jan-Erik Rediger
- *
- * See file LICENSE for license information.
- *
- * sighandler.c: contains all functions for signal handling
+ * © 2009 Michael Stapelberg and contributors (see also: LICENSE)
*
*/
+#include "all.h"
+
#include <ev.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
#include <iconv.h>
#include <signal.h>
+#include <sys/wait.h>
-#include <xcb/xcb.h>
-#include <xcb/xcb_aux.h>
#include <xcb/xcb_event.h>
-#include <xcb/xcb_keysyms.h>
#include <X11/keysym.h>
-#include "i3.h"
-#include "util.h"
-#include "xcb.h"
-#include "log.h"
-#include "config.h"
-#include "xinerama.h"
+typedef struct dialog_t {
+ xcb_window_t id;
+ xcb_colormap_t colormap;
+ Rect dims;
+ surface_t surface;
-static xcb_gcontext_t pixmap_gc;
-static xcb_pixmap_t pixmap;
-static int raised_signal;
+ TAILQ_ENTRY(dialog_t)
+ dialogs;
+} dialog_t;
-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.",
- "If you want to keep your session,",
- "press 'r' to restart i3 in-place."
-};
-static int crash_text_longest = 1;
+static TAILQ_HEAD(dialogs_head, dialog_t) dialogs = TAILQ_HEAD_INITIALIZER(dialogs);
+static int raised_signal;
+static int backtrace_done = 0;
+
+static int sighandler_backtrace(void);
+static void sighandler_setup(void);
+static void sighandler_create_dialogs(void);
+static void sighandler_destroy_dialogs(void);
+static void sighandler_handle_expose(void);
+static void sighandler_draw_dialog(dialog_t *dialog);
+static void sighandler_handle_key_press(xcb_key_press_event_t *event);
+
+static i3String *message_intro;
+static i3String *message_intro2;
+static i3String *message_option_backtrace;
+static i3String *message_option_restart;
+static i3String *message_option_forget;
+static int dialog_width;
+static int dialog_height;
+
+static int border_width = 2;
+static int margin = 4;
/*
- * Draw the window containing the info text
- *
+ * Attach gdb to pid_parent and dump a backtrace to i3-backtrace.$pid in the
+ * tmpdir
*/
-static int sig_draw_window(xcb_connection_t *conn, 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_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#FF0000"));
- xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &border);
- xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#000000"));
- xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &inner);
-
- /* restore font color */
- xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#FFFFFF"));
-
- char *full_text;
- int text_len;
- int i;
- int crash_text_num = sizeof(crash_text) / sizeof(char*);
- for (i = 0; i < crash_text_num; i++) {
- text_len = strlen(crash_text[i]);
- full_text = convert_utf8_to_ucs2(crash_text[i], &text_len);
- xcb_image_text_16(conn, text_len, pixmap, pixmap_gc, 8 /* X */,
- 3 + (i+1)*font_height /* Y = baseline of font */, (xcb_char2b_t*)full_text);
- free(full_text);
+static int sighandler_backtrace(void) {
+ char *tmpdir = getenv("TMPDIR");
+ if (tmpdir == NULL)
+ tmpdir = "/tmp";
+
+ pid_t pid_parent = getpid();
+
+ char *filename = NULL;
+ int suffix = 0;
+ struct stat bt;
+ /* Find a unique filename for the backtrace (since the PID of i3 stays the
+ * same), so that we don’t overwrite earlier backtraces. */
+ do {
+ FREE(filename);
+ sasprintf(&filename, "%s/i3-backtrace.%d.%d.txt", tmpdir, pid_parent, suffix);
+ suffix++;
+ } while (stat(filename, &bt) == 0);
+
+ pid_t pid_gdb = fork();
+ if (pid_gdb < 0) {
+ DLOG("Failed to fork for GDB\n");
+ return -1;
+ } else if (pid_gdb == 0) {
+ /* child */
+ int stdin_pipe[2],
+ stdout_pipe[2];
+
+ if (pipe(stdin_pipe) == -1) {
+ ELOG("Failed to init stdin_pipe\n");
+ return -1;
+ }
+ if (pipe(stdout_pipe) == -1) {
+ ELOG("Failed to init stdout_pipe\n");
+ return -1;
}
- /* 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;
+ /* close standard streams in case i3 is started from a terminal; gdb
+ * needs to run without controlling terminal for it to work properly in
+ * this situation */
+ close(STDIN_FILENO);
+ close(STDOUT_FILENO);
+ close(STDERR_FILENO);
+
+ /* We provide pipe file descriptors for stdin/stdout because gdb < 7.5
+ * crashes otherwise, see
+ * https://sourceware.org/bugzilla/show_bug.cgi?id=14114 */
+ dup2(stdin_pipe[0], STDIN_FILENO);
+ dup2(stdout_pipe[1], STDOUT_FILENO);
+
+ char *pid_s, *gdb_log_cmd;
+ sasprintf(&pid_s, "%d", pid_parent);
+ sasprintf(&gdb_log_cmd, "set logging file %s", filename);
+
+ char *args[] = {
+ "gdb",
+ start_argv[0],
+ "-p",
+ pid_s,
+ "-batch",
+ "-nx",
+ "-ex", gdb_log_cmd,
+ "-ex", "set logging on",
+ "-ex", "bt full",
+ "-ex", "quit",
+ NULL};
+ execvp(args[0], args);
+ DLOG("Failed to exec GDB\n");
+ exit(1);
+ }
+ int status = 0;
+
+ waitpid(pid_gdb, &status, 0);
+
+ /* see if the backtrace was successful or not */
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ DLOG("GDB did not run properly\n");
+ return -1;
+ } else if (stat(filename, &bt) == -1) {
+ DLOG("GDB executed successfully, but no backtrace was generated\n");
+ return -1;
+ }
+ return 1;
}
+static void sighandler_setup(void) {
+ border_width = logical_px(border_width);
+ margin = logical_px(margin);
-/*
- * 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) {
- xcb_keysym_t sym = xcb_key_press_lookup_keysym(keysyms, event, event->state);
+ int num_lines = 5;
+ message_intro = i3string_from_utf8("i3 has just crashed. Please report a bug for this.");
+ message_intro2 = i3string_from_utf8("To debug this problem, you can either attach gdb or choose from the following options:");
+ message_option_backtrace = i3string_from_utf8("- 'b' to save a backtrace (requires gdb)");
+ message_option_restart = i3string_from_utf8("- 'r' to restart i3 in-place");
+ message_option_forget = i3string_from_utf8("- 'f' to forget the previous layout and restart i3");
- if (sym == 'e') {
- LOG("User issued exit-command, raising error again.\n");
- raise(raised_signal);
- exit(1);
- }
- if (sym == 'r')
- i3_restart();
+ int width_longest_message = predict_text_width(message_intro2);
- return 1;
+ dialog_width = width_longest_message + 2 * border_width + 2 * margin;
+ dialog_height = num_lines * config.font.height + 2 * border_width + 2 * margin;
}
-/*
- * 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 root = xcb_setup_roots_iterator(xcb_get_setup(conn)).data->root;
- xcb_window_t win = xcb_generate_id(conn);
+static void sighandler_create_dialogs(void) {
+ Output *output;
+ TAILQ_FOREACH(output, &outputs, outputs) {
+ if (!output->active) {
+ continue;
+ }
+
+ dialog_t *dialog = scalloc(1, sizeof(struct dialog_t));
+ TAILQ_INSERT_TAIL(&dialogs, dialog, dialogs);
+
+ xcb_visualid_t visual = get_visualid_by_depth(root_depth);
+ dialog->colormap = xcb_generate_id(conn);
+ xcb_create_colormap(conn, XCB_COLORMAP_ALLOC_NONE, dialog->colormap, root, visual);
uint32_t mask = 0;
- uint32_t values[3];
+ uint32_t values[4];
+ int i = 0;
+ /* Needs to be set in the case of a 32-bit root depth. */
mask |= XCB_CW_BACK_PIXEL;
- values[0] = 0;
+ values[i++] = root_screen->black_pixel;
+
+ /* Needs to be set in the case of a 32-bit root depth. */
+ mask |= XCB_CW_BORDER_PIXEL;
+ values[i++] = root_screen->black_pixel;
mask |= XCB_CW_OVERRIDE_REDIRECT;
- values[1] = 1;
-
- mask |= XCB_CW_EVENT_MASK;
- values[2] = XCB_EVENT_MASK_EXPOSURE;
-
- /* 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;
+ values[i++] = 1;
+
+ /* Needs to be set in the case of a 32-bit root depth. */
+ mask |= XCB_CW_COLORMAP;
+ values[i++] = dialog->colormap;
+
+ dialog->dims.x = output->rect.x + (output->rect.width / 2);
+ dialog->dims.y = output->rect.y + (output->rect.height / 2);
+ dialog->dims.width = dialog_width;
+ dialog->dims.height = dialog_height;
+
+ /* Make sure the dialog is centered. */
+ dialog->dims.x -= dialog->dims.width / 2;
+ dialog->dims.y -= dialog->dims.height / 2;
+
+ dialog->id = create_window(conn, dialog->dims, root_depth, visual,
+ XCB_WINDOW_CLASS_INPUT_OUTPUT, XCURSOR_CURSOR_POINTER,
+ true, mask, values);
+
+ draw_util_surface_init(conn, &(dialog->surface), dialog->id, get_visualtype_by_id(visual),
+ dialog->dims.width, dialog->dims.height);
+
+ xcb_grab_keyboard(conn, false, dialog->id, XCB_CURRENT_TIME, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
+
+ /* Confine the pointer to the crash dialog. */
+ xcb_grab_pointer(conn, false, dialog->id, XCB_NONE, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC, dialog->id,
+ XCB_NONE, XCB_CURRENT_TIME);
+ }
+
+ sighandler_handle_expose();
+ xcb_flush(conn);
}
-/*
- * 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) {
- LOG("i3 crashed. SIG: %d\n", sig);
+static void sighandler_destroy_dialogs(void) {
+ while (!TAILQ_EMPTY(&dialogs)) {
+ dialog_t *dialog = TAILQ_FIRST(&dialogs);
+
+ xcb_free_colormap(conn, dialog->colormap);
+ draw_util_surface_free(conn, &(dialog->surface));
+ xcb_destroy_window(conn, dialog->id);
+
+ TAILQ_REMOVE(&dialogs, dialog, dialogs);
+ free(dialog);
+ }
+
+ xcb_flush(conn);
+}
- struct sigaction action;
- action.sa_handler = SIG_DFL;
- sigaction(sig, &action, NULL);
- raised_signal = sig;
+static void sighandler_handle_expose(void) {
+ dialog_t *current;
+ TAILQ_FOREACH(current, &dialogs, dialogs) {
+ sighandler_draw_dialog(current);
+ }
- xcb_connection_t *conn = global_conn;
+ xcb_flush(conn);
+}
- /* Set up event handlers for key press and key release */
- xcb_event_handlers_t sig_evenths;
- memset(&sig_evenths, 0, sizeof(xcb_event_handlers_t));
- xcb_event_handlers_init(conn, &sig_evenths);
- xcb_event_set_key_press_handler(&sig_evenths, sig_handle_key_press, NULL);
+static void sighandler_draw_dialog(dialog_t *dialog) {
+ const color_t black = draw_util_hex_to_color("#000000");
+ const color_t white = draw_util_hex_to_color("#FFFFFF");
+ const color_t red = draw_util_hex_to_color("#FF0000");
- i3Font *font = load_font(conn, config.font);
+ /* Start with a clean slate and draw a red border. */
+ draw_util_clear_surface(&(dialog->surface), red);
+ draw_util_rectangle(&(dialog->surface), black, border_width, border_width,
+ dialog->dims.width - 2 * border_width, dialog->dims.height - 2 * border_width);
- /* 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 * font->height);
+ int y = border_width + margin;
+ const int x = border_width + margin;
+ const int max_width = dialog->dims.width - 2 * x;
- /* calculate width for longest text */
- int text_len = strlen(crash_text[crash_text_longest]);
- char *longest_text = convert_utf8_to_ucs2(crash_text[crash_text_longest], &text_len);
- int font_width = predict_text_width(conn, config.font, longest_text, text_len);
- int width = font_width + 20;
+ draw_util_text(message_intro, &(dialog->surface), white, black, x, y, max_width);
+ y += config.font.height;
- /* Open an popup window on each virtual screen */
- i3Screen *screen;
- xcb_window_t win;
- TAILQ_FOREACH(screen, virtual_screens, screens) {
- LOG("%d, %d, %d, %d\n", screen->rect.width, screen->rect.height, screen->rect.x, screen->rect.y);
+ draw_util_text(message_intro2, &(dialog->surface), white, black, x, y, max_width);
+ y += config.font.height;
- win = open_input_window(conn, screen->rect, width, height);
+ char *bt_color = "#FFFFFF";
+ if (backtrace_done < 0) {
+ bt_color = "#AA0000";
+ } else if (backtrace_done > 0) {
+ bt_color = "#00AA00";
+ }
+ draw_util_text(message_option_backtrace, &(dialog->surface), draw_util_hex_to_color(bt_color), black, x, y, max_width);
+ y += config.font.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);
+ draw_util_text(message_option_restart, &(dialog->surface), white, black, x, y, max_width);
+ y += config.font.height;
- /* Create graphics context */
- xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FONT, font->id);
+ draw_util_text(message_option_forget, &(dialog->surface), white, black, x, y, max_width);
+ y += config.font.height;
+}
- /* Grab the keyboard to get all input */
- xcb_grab_keyboard(conn, false, win, XCB_CURRENT_TIME, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
+static void sighandler_handle_key_press(xcb_key_press_event_t *event) {
+ uint16_t state = event->state;
+
+ /* Apparently, 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 == 'b') {
+ DLOG("User issued core-dump command.\n");
+
+ /* fork and exec/attach GDB to the parent to get a backtrace in the
+ * tmpdir */
+ backtrace_done = sighandler_backtrace();
+ sighandler_handle_expose();
+ } else if (sym == 'r') {
+ sighandler_destroy_dialogs();
+ i3_restart(false);
+ } else if (sym == 'f') {
+ sighandler_destroy_dialogs();
+ i3_restart(true);
+ }
+}
- sig_draw_window(conn, win, width, height, font->height);
- xcb_flush(conn);
+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;
+ action.sa_flags = 0;
+ sigemptyset(&action.sa_mask);
+ sigaction(sig, &action, NULL);
+ raised_signal = sig;
+
+ sighandler_setup();
+ sighandler_create_dialogs();
+
+ 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);
+ switch (type) {
+ case XCB_KEY_PRESS:
+ sighandler_handle_key_press((xcb_key_press_event_t *)event);
+ break;
+ case XCB_EXPOSE:
+ if (((xcb_expose_event_t *)event)->count == 0) {
+ sighandler_handle_expose();
+ }
+
+ break;
}
- xcb_event_wait_for_event_loop(&sig_evenths);
+ free(event);
+ }
}
/*
- * 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() {
- struct sigaction action;
- action.sa_sigaction = handle_signal;
- action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
- sigemptyset(&action.sa_mask);
- sigaction(SIGSEGV, &action, NULL);
- sigaction(SIGFPE, &action, NULL);
+void setup_signal_handler(void) {
+ 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.\n");
}
projects / i3 / i3 / blobdiff