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preload library source

preload.c (text/plain), 2.13 KB, created by Baldur Karlsson on 2017-08-04 11:38:00 UTC

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Description:

Filename:

MIME Type:

Creator: Baldur Karlsson

Created: 2017-08-04 11:38:00 UTC

Size: 2.13 KB

patch

obsolete

>#define _GNU_SOURCE
>#include <dlfcn.h>
>#include <stdio.h>
>#include <string.h>
>#include <GL/glx.h>
>
>typedef GLXContext (*PFNGLXCREATECONTEXTPROC)(Display *dpy, XVisualInfo *vis, GLXContext shareList,
>                                              Bool direct);
>typedef __GLXextFuncPtr (*PFNGLXGETPROCADDRESSARBPROC) (const GLubyte *procName);
>typedef const GLubyte *(*PFNGLGETSTRINGPROC) (GLenum name);
>typedef Bool (*PFNGLXQUERYEXTENSIONPROC)(Display *dpy, int *errorb, int *event);
>
>void *handle = NULL;
>
>__GLXextFuncPtr fetchFunc(const char *name)
>{
>  if(!handle)
>    handle = dlopen("libGL.so", RTLD_NOW);
>
>  __GLXextFuncPtr ret = (__GLXextFuncPtr)dlsym(handle, name);
>
>  if(!ret)
>  {
>    PFNGLXGETPROCADDRESSARBPROC getproc = (PFNGLXGETPROCADDRESSARBPROC)dlsym(handle, "glXGetProcAddressARB");
>    ret = getproc((const GLubyte *)name);
>  }
>
>  return ret;
>}
>
>const GLubyte *glGetString(GLenum name)
>{
>  PFNGLGETSTRINGPROC real = (PFNGLGETSTRINGPROC)fetchFunc("glGetString");
>  printf("Inside hooked glGetString(%x)\n", name);
>  return real(name);
>}
>
>Bool glXQueryExtension(Display *dpy, int *errorb, int *event)
>{
>  PFNGLXQUERYEXTENSIONPROC real = (PFNGLXQUERYEXTENSIONPROC)fetchFunc("glXQueryExtension");
>  // just pass through, we need this since SDL expects to dlsym it
>  return real(dpy, errorb, event);
>}
>
>GLXContext glXCreateContext(Display *dpy, XVisualInfo *vis, GLXContext shareList, Bool direct)
>{
>  PFNGLXCREATECONTEXTPROC real = (PFNGLXCREATECONTEXTPROC)fetchFunc("glXCreateContext");
>  printf("Inside hooked glXCreateContext\n");
>  return real(dpy, vis, shareList, direct);
>}
>
>__GLXextFuncPtr glXGetProcAddressARB(const GLubyte *f)
>{
>  PFNGLXGETPROCADDRESSARBPROC real = (PFNGLXGETPROCADDRESSARBPROC)fetchFunc("glXGetProcAddressARB");
>  //printf("glXGetProcAddressARB(%s)\n", (const char *)f);
>
>  if(!strcmp(f, "glXCreateContext"))
>  {
>    //printf("Returning hooked %s\n", f);
>    return (__GLXextFuncPtr)&glXCreateContext;
>  }
>
>  if(!strcmp(f, "glGetString"))
>  {
>    //printf("Returning hooked %s\n", f);
>    return (__GLXextFuncPtr)&glGetString;
>  }
>
>  return real(f);
>}
>
>__GLXextFuncPtr glXGetProcAddress(const GLubyte *f)
>{
>  return glXGetProcAddressARB(f);
>}

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Attachments on bug 3725: 2818

We are currently migrating Bugzilla to GitHub issues.Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.

We are currently migrating Bugzilla to GitHub issues.
Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.
When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.