+#undef I3__FILE__
+#define I3__FILE__ "sighandler.c"
/*
- * vim:ts=8:expandtab
+ * vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
- *
- * © 2009-2010 Michael Stapelberg and contributors
+ * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
* © 2009-2010 Jan-Erik Rediger
*
- * See file LICENSE for license information.
- *
- * sighandler.c: contains all functions for signal handling
+ * sighandler.c: Interactive crash dialog upon SIGSEGV/SIGABRT/SIGFPE (offers
+ * to restart inplace).
*
*/
+#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_keysyms.h>
+#include <xcb/xcb_event.h>
#include <X11/keysym.h>
-#include "i3.h"
-#include "util.h"
-#include "xcb.h"
-#include "log.h"
-#include "config.h"
-#include "randr.h"
+static void open_popups(void);
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.",
- "If you want to keep your session,",
- "press 'r' to restart i3 in-place."
+ "i3 just crashed.",
+ "To debug this problem, either attach gdb now",
+ "or press",
+ "- 'b' to save a backtrace (needs GDB),",
+ "- 'r' to restart i3 in-place or",
+ "- 'f' to forget the current layout and restart"
};
-static int crash_text_longest = 1;
+static int crash_text_longest = 5;
+static int backtrace_string_index = 3;
+static int backtrace_done = 0;
+
+/*
+ * Attach gdb to pid_parent and dump a backtrace to i3-backtrace.$pid in the
+ * tmpdir
+ */
+static int 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];
+
+ pipe(stdin_pipe);
+ pipe(stdout_pipe);
+
+ /* 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
+ * http://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 succesful 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;
+}
/*
* Draw the window containing the info text
*
*/
-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"));
-
- for (int i = 0; i < sizeof(crash_text) / sizeof(char*); i++) {
- int text_len = strlen(crash_text[i]);
- char *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);
- }
-
- /* 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;
+static int sig_draw_window(xcb_window_t win, int width, int height, int font_height, i3String **crash_text_i3strings) {
+ /* 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"));
+
+ char *bt_colour = "#FFFFFF";
+ if (backtrace_done < 0)
+ bt_colour = "#AA0000";
+ else if (backtrace_done > 0)
+ bt_colour = "#00AA00";
+
+ for (int i = 0; crash_text_i3strings[i] != NULL; ++i) {
+ /* fix the colour for the backtrace line when it finished */
+ if (i == backtrace_string_index)
+ set_font_colors(pixmap_gc, get_colorpixel(bt_colour), get_colorpixel("#000000"));
+
+ draw_text(crash_text_i3strings[i], pixmap, pixmap_gc,
+ 8, 5 + i * font_height, width - 16);
+
+ /* and reset the colour again for other lines */
+ if (i == backtrace_string_index)
+ set_font_colors(pixmap_gc, get_colorpixel("#FFFFFF"), get_colorpixel("#000000"));
+ }
+
+ /* 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
+ * Handles keypresses of 'b', 'r' and 'f' to get a backtrace 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;
+ 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;
+ /* 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);
+ 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 == '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 = backtrace();
+
+ /* re-open the windows to indicate that it's finished */
+ open_popups();
+ }
- if (sym == 'r')
- i3_restart();
+ if (sym == 'r')
+ i3_restart(false);
- return 1;
+ if (sym == 'f')
+ i3_restart(true);
+
+ return 1;
}
/*
*
*/
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);
+ xcb_window_t win = xcb_generate_id(conn);
+
+ uint32_t mask = 0;
+ uint32_t values[2];
- uint32_t mask = 0;
- uint32_t values[2];
+ mask |= XCB_CW_BACK_PIXEL;
+ values[0] = 0;
- mask |= XCB_CW_BACK_PIXEL;
- values[0] = 0;
+ mask |= XCB_CW_OVERRIDE_REDIRECT;
+ values[1] = 1;
- 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));
- /* 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);
- 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);
- /* Map the window (= make it visible) */
- xcb_map_window(conn, win);
+ return win;
+}
- return win;
+static void open_popups() {
+ /* 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);
+
+ int crash_text_length = sizeof(crash_text) / sizeof(char*);
+ i3String **crash_text_i3strings = smalloc(sizeof(i3String *) * (crash_text_length + 1));
+ /* Pre-compute i3Strings for our text */
+ for (int i = 0; i < crash_text_length; ++i) {
+ crash_text_i3strings[i] = i3string_from_utf8(crash_text[i]);
+ }
+ crash_text_i3strings[crash_text_length] = NULL;
+ /* calculate width for longest text */
+ int font_width = predict_text_width(crash_text_i3strings[crash_text_longest]);
+ 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, crash_text_i3strings);
+ 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;
- sigaction(sig, &action, NULL);
- raised_signal = sig;
-
- xcb_connection_t *conn = global_conn;
-
- /* setup event handler for key presses */
- 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);
-
- i3Font *font = load_font(conn, config.font);
-
- /* 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);
-
- /* 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;
-
- /* 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);
-
- /* Create graphics context */
- xcb_change_gc_single(conn, pixmap_gc, XCB_GC_FONT, font->id);
-
- /* 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(conn, win, width, height, font->height);
- xcb_flush(conn);
+ DLOG("i3 crashed. SIG: %d\n", sig);
+
+ struct sigaction action;
+ action.sa_handler = SIG_DFL;
+ sigaction(sig, &action, NULL);
+ raised_signal = sig;
+
+ open_popups();
+
+ 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);
}
-
- xcb_event_wait_for_event_loop(&sig_evenths);
+ 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);
-
- if (sigaction(SIGSEGV, &action, NULL) == -1 ||
- sigaction(SIGFPE, &action, NULL) == -1)
- ELOG("Could not setup signal handler");
+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");
}
projects / i3 / i3 / blobdiff