frontend/linux/xenv.c

   1 /*
   2  * (C) Gražvydas "notaz" Ignotas, 2009-2011
   3  *
   4  * This work is licensed under the terms of any of these licenses
   5  * (at your option):
   6  *  - GNU GPL, version 2 or later.
   7  *  - GNU LGPL, version 2.1 or later.
   8  * See the COPYING file in the top-level directory.
   9  */
  10
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <pthread.h>
  14
  15 #include <dlfcn.h>
  16 #include <X11/Xlib.h>
  17 #include <X11/Xutil.h>
  18 #include <X11/XKBlib.h>
  19
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24 #include <sys/ioctl.h>
  25 #include <termios.h>
  26 #include <linux/kd.h>
  27
  28 #define PFX "xenv: "
  29
  30 #define FPTR(f) typeof(f) * p##f
  31 #define FPTR_LINK(xf, dl, f) { \
  32         xf.p##f = dlsym(dl, #f); \
  33         if (xf.p##f == NULL) { \
  34                 fprintf(stderr, "missing symbol: %s\n", #f); \
  35                 goto fail; \
  36         } \
  37 }
  38
  39 struct xstuff {
  40         Display *display;
  41         FPTR(XCreateBitmapFromData);
  42         FPTR(XCreatePixmapCursor);
  43         FPTR(XFreePixmap);
  44         FPTR(XOpenDisplay);
  45         FPTR(XDisplayName);
  46         FPTR(XCloseDisplay);
  47         FPTR(XCreateSimpleWindow);
  48         FPTR(XChangeWindowAttributes);
  49         FPTR(XSelectInput);
  50         FPTR(XMapWindow);
  51         FPTR(XNextEvent);
  52         FPTR(XCheckTypedEvent);
  53         FPTR(XUnmapWindow);
  54         FPTR(XGrabKeyboard);
  55         FPTR(XPending);
  56         FPTR(XLookupKeysym);
  57         FPTR(XkbSetDetectableAutoRepeat);
  58 };
  59
  60 static struct xstuff g_xstuff;
  61
  62 static Cursor transparent_cursor(struct xstuff *xf, Display *display, Window win)
  63 {
  64         Cursor cursor;
  65         Pixmap pix;
  66         XColor dummy;
  67         char d = 0;
  68
  69         memset(&dummy, 0, sizeof(dummy));
  70         pix = xf->pXCreateBitmapFromData(display, win, &d, 1, 1);
  71         cursor = xf->pXCreatePixmapCursor(display, pix, pix,
  72                         &dummy, &dummy, 0, 0);
  73         xf->pXFreePixmap(display, pix);
  74         return cursor;
  75 }
  76
  77 static int x11h_init(void)
  78 {
  79         unsigned int display_width, display_height;
  80         Display *display;
  81         XSetWindowAttributes attributes;
  82         Window win;
  83         Visual *visual;
  84         void *x11lib;
  85         int screen;
  86
  87         memset(&g_xstuff, 0, sizeof(g_xstuff));
  88         x11lib = dlopen("libX11.so.6", RTLD_LAZY);
  89         if (x11lib == NULL) {
  90                 fprintf(stderr, "libX11.so load failed:\n%s\n", dlerror());
  91                 goto fail;
  92         }
  93         FPTR_LINK(g_xstuff, x11lib, XCreateBitmapFromData);
  94         FPTR_LINK(g_xstuff, x11lib, XCreatePixmapCursor);
  95         FPTR_LINK(g_xstuff, x11lib, XFreePixmap);
  96         FPTR_LINK(g_xstuff, x11lib, XOpenDisplay);
  97         FPTR_LINK(g_xstuff, x11lib, XDisplayName);
  98         FPTR_LINK(g_xstuff, x11lib, XCloseDisplay);
  99         FPTR_LINK(g_xstuff, x11lib, XCreateSimpleWindow);
 100         FPTR_LINK(g_xstuff, x11lib, XChangeWindowAttributes);
 101         FPTR_LINK(g_xstuff, x11lib, XSelectInput);
 102         FPTR_LINK(g_xstuff, x11lib, XMapWindow);
 103         FPTR_LINK(g_xstuff, x11lib, XNextEvent);
 104         FPTR_LINK(g_xstuff, x11lib, XCheckTypedEvent);
 105         FPTR_LINK(g_xstuff, x11lib, XUnmapWindow);
 106         FPTR_LINK(g_xstuff, x11lib, XGrabKeyboard);
 107         FPTR_LINK(g_xstuff, x11lib, XPending);
 108         FPTR_LINK(g_xstuff, x11lib, XLookupKeysym);
 109         FPTR_LINK(g_xstuff, x11lib, XkbSetDetectableAutoRepeat);
 110
 111         //XInitThreads();
 112
 113         g_xstuff.display = display = g_xstuff.pXOpenDisplay(NULL);
 114         if (display == NULL)
 115         {
 116                 fprintf(stderr, "cannot connect to X server %s, X handling disabled.\n",
 117                                 g_xstuff.pXDisplayName(NULL));
 118                 goto fail2;
 119         }
 120
 121         visual = DefaultVisual(display, 0);
 122         if (visual->class != TrueColor)
 123                 fprintf(stderr, PFX "warning: non true color visual\n");
 124
 125         printf(PFX "X vendor: %s, rel: %d, display: %s, protocol ver: %d.%d\n", ServerVendor(display),
 126                 VendorRelease(display), DisplayString(display), ProtocolVersion(display),
 127                 ProtocolRevision(display));
 128
 129         screen = DefaultScreen(display);
 130
 131         display_width = DisplayWidth(display, screen);
 132         display_height = DisplayHeight(display, screen);
 133         printf(PFX "display is %dx%d\n", display_width, display_height);
 134
 135         win = g_xstuff.pXCreateSimpleWindow(display,
 136                         RootWindow(display, screen),
 137                         0, 0, display_width, display_height, 0,
 138                         BlackPixel(display, screen),
 139                         BlackPixel(display, screen));
 140
 141         attributes.override_redirect = True;
 142         attributes.cursor = transparent_cursor(&g_xstuff, display, win);
 143         g_xstuff.pXChangeWindowAttributes(display, win, CWOverrideRedirect | CWCursor, &attributes);
 144
 145         g_xstuff.pXSelectInput(display, win, ExposureMask | FocusChangeMask | KeyPressMask | KeyReleaseMask);
 146         g_xstuff.pXMapWindow(display, win);
 147         g_xstuff.pXGrabKeyboard(display, win, False, GrabModeAsync, GrabModeAsync, CurrentTime);
 148         g_xstuff.pXkbSetDetectableAutoRepeat(display, 1, NULL);
 149         // XSetIOErrorHandler
 150
 151         return 0;
 152 fail2:
 153         dlclose(x11lib);
 154 fail:
 155         g_xstuff.display = NULL;
 156         fprintf(stderr, "x11 handling disabled.\n");
 157         return -1;
 158 }
 159
 160 static int x11h_update(int *is_down)
 161 {
 162         XEvent evt;
 163
 164         while (g_xstuff.pXPending(g_xstuff.display))
 165         {
 166                 g_xstuff.pXNextEvent(g_xstuff.display, &evt);
 167                 switch (evt.type)
 168                 {
 169                         case Expose:
 170                                 while (g_xstuff.pXCheckTypedEvent(g_xstuff.display, Expose, &evt))
 171                                         ;
 172                                 break;
 173
 174                         case KeyPress:
 175                                 *is_down = 1;
 176                                 return g_xstuff.pXLookupKeysym(&evt.xkey, 0);
 177
 178                         case KeyRelease:
 179                                 *is_down = 0;
 180                                 return g_xstuff.pXLookupKeysym(&evt.xkey, 0);
 181                                 // printf("press %d\n", evt.xkey.keycode);
 182                 }
 183         }
 184
 185         return NoSymbol;
 186 }
 187
 188 static struct termios g_kbd_termios_saved;
 189 static int g_kbdfd = -1;
 190
 191 static int tty_init(void)
 192 {
 193         struct termios kbd_termios;
 194         int mode;
 195
 196         g_kbdfd = open("/dev/tty", O_RDWR);
 197         if (g_kbdfd == -1) {
 198                 perror(PFX "open /dev/tty");
 199                 return -1;
 200         }
 201
 202         if (ioctl(g_kbdfd, KDGETMODE, &mode) == -1) {
 203                 perror(PFX "(not hiding FB): KDGETMODE");
 204                 goto fail;
 205         }
 206
 207         if (tcgetattr(g_kbdfd, &kbd_termios) == -1) {
 208                 perror(PFX "tcgetattr");
 209                 goto fail;
 210         }
 211
 212         g_kbd_termios_saved = kbd_termios;
 213         kbd_termios.c_lflag &= ~(ICANON | ECHO); // | ISIG);
 214         kbd_termios.c_iflag &= ~(ISTRIP | IGNCR | ICRNL | INLCR | IXOFF | IXON);
 215         kbd_termios.c_cc[VMIN] = 0;
 216         kbd_termios.c_cc[VTIME] = 0;
 217
 218         if (tcsetattr(g_kbdfd, TCSAFLUSH, &kbd_termios) == -1) {
 219                 perror(PFX "tcsetattr");
 220                 goto fail;
 221         }
 222
 223         if (ioctl(g_kbdfd, KDSETMODE, KD_GRAPHICS) == -1) {
 224                 perror(PFX "KDSETMODE KD_GRAPHICS");
 225                 tcsetattr(g_kbdfd, TCSAFLUSH, &g_kbd_termios_saved);
 226                 goto fail;
 227         }
 228
 229         return 0;
 230
 231 fail:
 232         close(g_kbdfd);
 233         g_kbdfd = -1;
 234         return -1;
 235 }
 236
 237 static void tty_end(void)
 238 {
 239         if (g_kbdfd < 0)
 240                 return;
 241
 242         if (ioctl(g_kbdfd, KDSETMODE, KD_TEXT) == -1)
 243                 perror(PFX "KDSETMODE KD_TEXT");
 244
 245         if (tcsetattr(g_kbdfd, TCSAFLUSH, &g_kbd_termios_saved) == -1)
 246                 perror(PFX "tcsetattr");
 247
 248         close(g_kbdfd);
 249         g_kbdfd = -1;
 250 }
 251
 252 int xenv_init(void)
 253 {
 254         int ret;
 255
 256         ret = x11h_init();
 257         if (ret == 0)
 258                 return 0;
 259
 260         ret = tty_init();
 261         if (ret == 0)
 262                 return 0;
 263
 264         fprintf(stderr, PFX "error: both x11h_init and tty_init failed\n");
 265         return -1;
 266 }
 267
 268 int xenv_update(int *is_down)
 269 {
 270         if (g_xstuff.display)
 271                 return x11h_update(is_down);
 272
 273         // TODO: read tty?
 274         return -1;
 275 }
 276
 277 void xenv_finish(void)
 278 {
 279         // TODO: cleanup X?
 280         tty_end();
 281 }