351 lines
11 KiB
C
351 lines
11 KiB
C
/*
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* vim:ts=4:sw=4:expandtab
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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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*
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*/
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#include "all.h"
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#include <signal.h>
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#include <sys/wait.h>
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#include <unistd.h>
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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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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 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 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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pid_t pid_parent = getpid();
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char *filename = NULL;
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int suffix = 0;
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/* Find a unique filename for the backtrace (since the PID of i3 stays the
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* same), so that we don’t overwrite earlier backtraces. */
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do {
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FREE(filename);
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sasprintf(&filename, "%s/i3-backtrace.%d.%d.txt", tmpdir, pid_parent, suffix);
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suffix++;
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} while (path_exists(filename));
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pid_t pid_gdb = fork();
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if (pid_gdb < 0) {
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DLOG("Failed to fork for GDB\n");
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return -1;
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} else if (pid_gdb == 0) {
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/* child */
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int stdin_pipe[2],
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stdout_pipe[2];
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if (pipe(stdin_pipe) == -1) {
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ELOG("Failed to init stdin_pipe\n");
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return -1;
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}
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if (pipe(stdout_pipe) == -1) {
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ELOG("Failed to init stdout_pipe\n");
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return -1;
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}
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/* close standard streams in case i3 is started from a terminal; gdb
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* needs to run without controlling terminal for it to work properly in
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* this situation */
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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/* We provide pipe file descriptors for stdin/stdout because gdb < 7.5
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* crashes otherwise, see
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* https://sourceware.org/bugzilla/show_bug.cgi?id=14114 */
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dup2(stdin_pipe[0], STDIN_FILENO);
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dup2(stdout_pipe[1], STDOUT_FILENO);
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char *pid_s, *gdb_log_cmd;
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sasprintf(&pid_s, "%d", pid_parent);
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sasprintf(&gdb_log_cmd, "set logging file %s", filename);
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char *args[] = {
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"gdb",
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start_argv[0],
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"-p",
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pid_s,
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"-batch",
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"-nx",
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"-ex", gdb_log_cmd,
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"-ex", "set logging on",
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"-ex", "bt full",
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"-ex", "quit",
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NULL};
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execvp(args[0], args);
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DLOG("Failed to exec GDB\n");
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exit(EXIT_FAILURE);
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}
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int status = 0;
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waitpid(pid_gdb, &status, 0);
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/* see if the backtrace was successful or not */
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
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DLOG("GDB did not run properly\n");
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return -1;
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} else if (!path_exists(filename)) {
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DLOG("GDB executed successfully, but no backtrace was generated\n");
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return -1;
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}
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return 1;
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}
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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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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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int width_longest_message = predict_text_width(message_intro2);
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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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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(&(dialog->surface), red);
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draw_util_rectangle(&(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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* stays turned on (use xev(1) to verify). So, to resolve useful
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* keysyms, we remove the numlock flag from the event state */
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state &= ~xcb_numlock_mask;
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xcb_keysym_t sym = xcb_key_press_lookup_keysym(keysyms, event, state);
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if (sym == 'b') {
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DLOG("User issued core-dump command.\n");
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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 = 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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} else if (sym == 'f') {
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sighandler_destroy_dialogs();
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i3_restart(true);
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}
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}
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static 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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struct sigaction action;
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action.sa_handler = SIG_DFL;
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action.sa_flags = 0;
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sigemptyset(&action.sa_mask);
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sigaction(sig, &action, NULL);
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raised_signal = sig;
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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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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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* 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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struct sigaction action;
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action.sa_sigaction = handle_signal;
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action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
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sigemptyset(&action.sa_mask);
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/* Catch all signals with default action "Core", see signal(7) */
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if (sigaction(SIGQUIT, &action, NULL) == -1 ||
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sigaction(SIGILL, &action, NULL) == -1 ||
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sigaction(SIGABRT, &action, NULL) == -1 ||
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sigaction(SIGFPE, &action, NULL) == -1 ||
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sigaction(SIGSEGV, &action, NULL) == -1)
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ELOG("Could not setup signal handler.\n");
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}
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