src/xopenhook.c

   1
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <dlfcn.h>
   5 #include <unistd.h>
   6 #include <err.h>
   7 #include <errno.h>
   8 #include <string.h>
   9 #include <sys/stat.h>
  10 #include <X11/Xlib.h>
  11
  12 void _xopenhook_preload_run(const char * phase)
  13 {
  14         char * xopenhook_enable = getenv("XOPENHOOK_ENABLE");
  15         if(xopenhook_enable != NULL && strcmp(xopenhook_enable, "1")==0)
  16         {
  17                 unsetenv("XOPENHOOK_ENABLE");
  18                 setenv("XOPENHOOK_PHASE", phase, 1);
  19                 system(getenv("XOPENHOOK_COMMAND"));
  20                 unsetenv("XOPENHOOK_PHASE");
  21                 setenv("XOPENHOOK_ENABLE", xopenhook_enable, 1);
  22         }
  23 }
  24
  25 Display* XOpenDisplay(const char * display_name)
  26 {
  27         Display* (*real_XOpenDisplay)(const char *) = dlsym(RTLD_NEXT, "XOpenDisplay");
  28
  29         Display* display_handle = real_XOpenDisplay(display_name);
  30         if(display_handle != NULL) _xopenhook_preload_run("post-XOpenDisplay");
  31
  32         return display_handle;
  33 }
  34
  35
  36 #include <Xvlibint.h>
  37
  38 XvImageFormatValues * XvListImageFormats (
  39    Display      *dpy,
  40    XvPortID     port,
  41    int          *num
  42 ){
  43         XvImageFormatValues* (*real_XvListImageFormats)(Display*, XvPortID, int*) = dlsym(RTLD_NEXT, "XvListImageFormats");
  44
  45         _xopenhook_preload_run("pre-XvListImageFormats");
  46         XvImageFormatValues *ret = real_XvListImageFormats(dpy, port, num);
  47         _xopenhook_preload_run("post-XvListImageFormats");
  48
  49         return ret;
  50 }