glxtrace: Use dlsym protection only on wrappers.

Similar in spirit to the Lawrence Love's pull request #203, but instead
of building multiple variants of glproc_gl.cpp simply move the
dlsym protection code into wrappers dir.

1 files changed, 1 insertions, 53 deletions

diff --git a/dispatch/glproc_gl.cpp b/dispatch/glproc_gl.cpp
index 0ced2f95..fdbea05c 100644
--- a/dispatch/glproc_gl.cpp
+++ b/dispatch/glproc_gl.cpp
@@ -160,58 +160,6 @@ logSymbol(const char *name, void *ptr) {
 }
 
 
-#ifdef __GLIBC__
-extern "C" void * __libc_dlsym(void *, const char *);
-#endif
-
-
-/*
- * Protect against dlsym interception.
- *
- * We implement the whole API, so we don't need to intercept dlsym -- dlopen is
- * enough. However we need to protect against other dynamic libraries
- * intercepting dlsym, to prevent infinite recursion,
- *
- * In particular the Steam Community Overlay advertises dlsym. See also
- * http://lists.freedesktop.org/archives/apitrace/2013-March/000573.html
- */
-static inline void *
-_dlsym(void *handle, const char *symbol)
-{
-    void *result;
-
-#ifdef __GLIBC__
-    /*
-     * We rely on glibc's internal __libc_dlsym.  See also
-     * http://www.linuxforu.com/2011/08/lets-hook-a-library-function/
-     *
-     * Use use it to obtain the true dlsym.  We don't use __libc_dlsym directly
-     * because it does not support things such as RTLD_NEXT.
-     */
-    typedef void * (*PFN_DLSYM)(void *, const char *);
-    static PFN_DLSYM dlsym_ptr = NULL;
-    if (!dlsym_ptr) {
-        void *libdl_handle = _dlopen("libdl.so.2", RTLD_LOCAL | RTLD_NOW);
-        if (libdl_handle) {
-            dlsym_ptr = (PFN_DLSYM)__libc_dlsym(libdl_handle, "dlsym");
-        }
-        if (!dlsym_ptr) {
-            os::log("apitrace: error: failed to look up real dlsym\n");
-            return NULL;
-        }
-
-        logSymbol("dlsym", (void*)dlsym_ptr);
-    }
-
-    result = dlsym_ptr(handle, symbol);
-#else
-    result = dlsym(handle, symbol);
-#endif
-
-    return result;
-}
-
-
 /*
  * Lookup a libGL symbol
  */
@@ -255,7 +203,7 @@ void * _libgl_sym(const char *symbol)
         }
     }
 
-    result = _dlsym(_libGlHandle, symbol);
+    result = dlsym(_libGlHandle, symbol);
 
     logSymbol(symbol, result);