linux/oshide.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <pthread.h>
   4
   5 #include <dlfcn.h>
   6 #include <X11/Xlib.h>
   7 #include <X11/Xutil.h>
   8
   9 #include <sys/types.h>
  10 #include <sys/stat.h>
  11 #include <fcntl.h>
  12 #include <unistd.h>
  13 #include <sys/ioctl.h>
  14 #include <termios.h>
  15 #include <linux/kd.h>
  16
  17 #define PFX "oshide: "
  18
  19 #define FPTR(f) typeof(f) * p##f
  20 #define FPTR_LINK(xf, dl, f) { \
  21         xf.p##f = dlsym(dl, #f); \
  22         if (xf.p##f == NULL) { \
  23                 fprintf(stderr, "missing symbol: %s\n", #f); \
  24                 goto fail; \
  25         } \
  26 }
  27
  28 struct xfuncs {
  29 FPTR(XCreateBitmapFromData);
  30 FPTR(XCreatePixmapCursor);
  31 FPTR(XFreePixmap);
  32 FPTR(XOpenDisplay);
  33 FPTR(XDisplayName);
  34 FPTR(XCloseDisplay);
  35 FPTR(XCreateSimpleWindow);
  36 FPTR(XChangeWindowAttributes);
  37 FPTR(XSelectInput);
  38 FPTR(XMapWindow);
  39 FPTR(XNextEvent);
  40 FPTR(XCheckTypedEvent);
  41 FPTR(XUnmapWindow);
  42 FPTR(XGrabKeyboard);
  43 };
  44
  45
  46 static Cursor transparent_cursor(struct xfuncs *xf, Display *display, Window win)
  47 {
  48         Cursor cursor;
  49         Pixmap pix;
  50         XColor dummy;
  51         char d = 0;
  52
  53         memset(&dummy, 0, sizeof(dummy));
  54         pix = xf->pXCreateBitmapFromData(display, win, &d, 1, 1);
  55         cursor = xf->pXCreatePixmapCursor(display, pix, pix,
  56                         &dummy, &dummy, 0, 0);
  57         xf->pXFreePixmap(display, pix);
  58         return cursor;
  59 }
  60
  61 static void *x11h_handler(void *arg)
  62 {
  63         struct xfuncs xf;
  64         unsigned int display_width, display_height;
  65         XSetWindowAttributes attributes;
  66         Window win;
  67         XEvent report;
  68         Display *display;
  69         Visual *visual;
  70         void *x11lib;
  71         int screen;
  72
  73         memset(&xf, 0, sizeof(xf));
  74         x11lib = dlopen("libX11.so.6", RTLD_LAZY);
  75         if (x11lib == NULL) {
  76                 fprintf(stderr, "libX11.so load failed:\n%s\n", dlerror());
  77                 goto fail;
  78         }
  79         FPTR_LINK(xf, x11lib, XCreateBitmapFromData);
  80         FPTR_LINK(xf, x11lib, XCreatePixmapCursor);
  81         FPTR_LINK(xf, x11lib, XFreePixmap);
  82         FPTR_LINK(xf, x11lib, XOpenDisplay);
  83         FPTR_LINK(xf, x11lib, XDisplayName);
  84         FPTR_LINK(xf, x11lib, XCloseDisplay);
  85         FPTR_LINK(xf, x11lib, XCreateSimpleWindow);
  86         FPTR_LINK(xf, x11lib, XChangeWindowAttributes);
  87         FPTR_LINK(xf, x11lib, XSelectInput);
  88         FPTR_LINK(xf, x11lib, XMapWindow);
  89         FPTR_LINK(xf, x11lib, XNextEvent);
  90         FPTR_LINK(xf, x11lib, XCheckTypedEvent);
  91         FPTR_LINK(xf, x11lib, XUnmapWindow);
  92         FPTR_LINK(xf, x11lib, XGrabKeyboard);
  93
  94         //XInitThreads();
  95
  96         display = xf.pXOpenDisplay(NULL);
  97         if (display == NULL)
  98         {
  99                 fprintf(stderr, "cannot connect to X server %s, X handling disabled.\n",
 100                                 xf.pXDisplayName(NULL));
 101                 goto fail2;
 102         }
 103
 104         visual = DefaultVisual(display, 0);
 105         if (visual->class != TrueColor)
 106                 fprintf(stderr, PFX "warning: non true color visual\n");
 107
 108         printf(PFX "X vendor: %s, rel: %d, display: %s, protocol ver: %d.%d\n", ServerVendor(display),
 109                 VendorRelease(display), DisplayString(display), ProtocolVersion(display),
 110                 ProtocolRevision(display));
 111
 112         screen = DefaultScreen(display);
 113
 114         display_width = DisplayWidth(display, screen);
 115         display_height = DisplayHeight(display, screen);
 116         printf(PFX "display is %dx%d\n", display_width, display_height);
 117
 118         win = xf.pXCreateSimpleWindow(display,
 119                         RootWindow(display, screen),
 120                         0, 0, display_width, display_height, 0,
 121                         BlackPixel(display, screen),
 122                         BlackPixel(display, screen));
 123
 124         attributes.override_redirect = True;
 125         attributes.cursor = transparent_cursor(&xf, display, win);
 126         xf.pXChangeWindowAttributes(display, win, CWOverrideRedirect | CWCursor, &attributes);
 127
 128         xf.pXSelectInput(display, win, ExposureMask | FocusChangeMask | KeyPressMask | KeyReleaseMask);
 129         xf.pXMapWindow(display, win);
 130         xf.pXGrabKeyboard(display, win, False, GrabModeAsync, GrabModeAsync, CurrentTime);
 131         // XSetIOErrorHandler
 132
 133         while (1)
 134         {
 135                 xf.pXNextEvent(display, &report);
 136                 switch (report.type)
 137                 {
 138                         case Expose:
 139                                 while (xf.pXCheckTypedEvent(display, Expose, &report))
 140                                         ;
 141                                 break;
 142
 143                         case FocusOut:
 144                                 // XFocusChangeEvent
 145                                 // printf("focus out\n");
 146                                 // xf.pXUnmapWindow(display, win);
 147                                 break;
 148
 149                         case KeyPress:
 150                                 // printf("press %d\n", report.xkey.keycode);
 151                                 break;
 152
 153                         default:
 154                                 break;
 155                 }
 156         }
 157
 158 fail2:
 159         dlclose(x11lib);
 160 fail:
 161         fprintf(stderr, "x11 handling disabled.\n");
 162         return NULL;
 163 }
 164
 165 static struct termios g_kbd_termios_saved;
 166 static int g_kbdfd;
 167
 168 static void hidecon_start(void)
 169 {
 170         struct termios kbd_termios;
 171         int mode;
 172
 173         g_kbdfd = open("/dev/tty", O_RDWR);
 174         if (g_kbdfd == -1) {
 175                 perror(PFX "open /dev/tty");
 176                 return;
 177         }
 178
 179         if (ioctl(g_kbdfd, KDGETMODE, &mode) == -1) {
 180                 perror(PFX "(not hiding FB): KDGETMODE");
 181                 goto fail;
 182         }
 183
 184         if (tcgetattr(g_kbdfd, &kbd_termios) == -1) {
 185                 perror(PFX "tcgetattr");
 186                 goto fail;
 187         }
 188
 189         g_kbd_termios_saved = kbd_termios;
 190         kbd_termios.c_lflag &= ~(ICANON | ECHO); // | ISIG);
 191         kbd_termios.c_iflag &= ~(ISTRIP | IGNCR | ICRNL | INLCR | IXOFF | IXON);
 192         kbd_termios.c_cc[VMIN] = 0;
 193         kbd_termios.c_cc[VTIME] = 0;
 194
 195         if (tcsetattr(g_kbdfd, TCSAFLUSH, &kbd_termios) == -1) {
 196                 perror(PFX "tcsetattr");
 197                 goto fail;
 198         }
 199
 200         if (ioctl(g_kbdfd, KDSETMODE, KD_GRAPHICS) == -1) {
 201                 perror(PFX "KDSETMODE KD_GRAPHICS");
 202                 tcsetattr(g_kbdfd, TCSAFLUSH, &g_kbd_termios_saved);
 203                 goto fail;
 204         }
 205
 206         return;
 207
 208 fail:
 209         close(g_kbdfd);
 210         g_kbdfd = -1;
 211 }
 212
 213 static void hidecon_end(void)
 214 {
 215         if (g_kbdfd < 0)
 216                 return;
 217
 218         if (ioctl(g_kbdfd, KDSETMODE, KD_TEXT) == -1)
 219                 perror(PFX "KDSETMODE KD_TEXT");
 220
 221         if (tcsetattr(g_kbdfd, TCSAFLUSH, &g_kbd_termios_saved) == -1)
 222                 perror(PFX "tcsetattr");
 223
 224         close(g_kbdfd);
 225         g_kbdfd = -1;
 226 }
 227
 228 int oshide_init(void)
 229 {
 230         pthread_t tid;
 231         int ret;
 232
 233         ret = pthread_create(&tid, NULL, x11h_handler, NULL);
 234         if (ret != 0) {
 235                 fprintf(stderr, PFX "failed to create thread: %d\n", ret);
 236                 return ret;
 237         }
 238         pthread_detach(tid);
 239
 240         hidecon_start();
 241
 242         return 0;
 243 }
 244
 245 void oshide_finish(void)
 246 {
 247         /* XXX: the X thread.. */
 248
 249         hidecon_end();
 250 }
 251
 252 #if 0
 253 int main()
 254 {
 255         x11h_init();
 256         sleep(5);
 257 }
 258 #endif