gri3-wm/src/sighandler.c

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/*
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* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
* © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
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* © 2009-2010 Jan-Erik Rediger
*
* sighandler.c: Interactive crash dialog upon SIGSEGV/SIGABRT/SIGFPE (offers
* to restart inplace).
*
*/
#include "all.h"
#include <ev.h>
#include <iconv.h>
#include <signal.h>
#include <xcb/xcb_event.h>
#include <X11/keysym.h>
static xcb_gcontext_t pixmap_gc;
static xcb_pixmap_t pixmap;
static int raised_signal;
static char *crash_text[] = {
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"i3 just crashed.",
"To debug this problem, either attach gdb now",
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"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"
};
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static int crash_text_longest = 5;
/*
* Draw the window containing the info text
*
*/
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static int sig_draw_window(xcb_window_t win, int width, int height, int font_height) {
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/* 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") });
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xcb_poly_fill_rectangle(conn, pixmap, pixmap_gc, 1, &border);
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);
/* restore font color */
set_font_colors(pixmap_gc, get_colorpixel("#FFFFFF"), get_colorpixel("#000000"));
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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, 5 + i * font_height, width - 16);
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}
/* 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) {
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uint16_t state = event->state;
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/* 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;
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xcb_keysym_t sym = xcb_key_press_lookup_keysym(keysyms, event, state);
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if (sym == 'e') {
DLOG("User issued exit-command, raising error again.\n");
raise(raised_signal);
exit(1);
}
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if (sym == 'r')
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i3_restart(false);
if (sym == 'f')
i3_restart(true);
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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) {
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xcb_window_t win = xcb_generate_id(conn);
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uint32_t mask = 0;
uint32_t values[2];
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mask |= XCB_CW_BACK_PIXEL;
values[0] = 0;
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mask |= XCB_CW_OVERRIDE_REDIRECT;
values[1] = 1;
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/* 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));
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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);
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/* Map the window (= make it visible) */
xcb_map_window(conn, win);
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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) {
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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);
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/* calculate width for longest text */
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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);
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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);
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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() {
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struct sigaction action;
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action.sa_sigaction = handle_signal;
action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
sigemptyset(&action.sa_mask);
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/* Catch all signals with default action "Core", see signal(7) */
if (sigaction(SIGQUIT, &action, NULL) == -1 ||
sigaction(SIGILL, &action, NULL) == -1 ||
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sigaction(SIGABRT, &action, NULL) == -1 ||
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sigaction(SIGFPE, &action, NULL) == -1 ||
sigaction(SIGSEGV, &action, NULL) == -1)
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ELOG("Could not setup signal handler");
}