+++ /dev/null
-/*
- * Copyright © 2013 Intel Corporation
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-#include <stdio.h>
-#include "dri_util.h"
-#include <dlfcn.h>
-
-/* We need GNU extensions to dlfcn.h in order to provide backward
- * compatibility for the older DRI driver loader mechanism. (dladdr,
- * Dl_info, and RTLD_DEFAULT)
- */
-#if defined(RTLD_DEFAULT) && defined(HAVE_DLADDR)
-
-#define MEGADRIVER_STUB_MAX_EXTENSIONS 10
-#define LIB_PATH_SUFFIX "_dri.so"
-#define LIB_PATH_SUFFIX_LENGTH (sizeof(LIB_PATH_SUFFIX)-1)
-
-/* This is the table of extensions that the loader will dlsym() for.
- *
- * Initially it is empty for the megadriver stub, but the library
- * constructor may initialize it based on the name of the library that
- * is being loaded.
- */
-PUBLIC const __DRIextension *
-__driDriverExtensions[MEGADRIVER_STUB_MAX_EXTENSIONS] = {
- NULL
-};
-
-/**
- * This is a constructor function for the megadriver dynamic library.
- *
- * When the driver is dlopen'ed, this function will run. It will
- * search for the name of the foo_dri.so file that was opened using
- * the dladdr function.
- *
- * After finding foo's name, it will call __driDriverGetExtensions_foo
- * and use the return to update __driDriverExtensions to enable
- * compatibility with older DRI driver loaders.
- */
-__attribute__((constructor)) static void
-megadriver_stub_init(void)
-{
- Dl_info info;
- char *driver_name;
- size_t name_len;
- char *get_extensions_name;
- const __DRIextension **(*get_extensions)(void);
- const __DRIextension **extensions;
- int i;
-
- /* Call dladdr on __driDriverExtensions. We are really
- * interested in the returned info.dli_fname so we can
- * figure out the path name of the library being loaded.
- */
- i = dladdr((void*) __driDriverExtensions, &info);
- if (i == 0)
- return;
-
- /* Search for the last '/' character in the path. */
- driver_name = strrchr(info.dli_fname, '/');
- if (driver_name != NULL) {
- /* Skip '/' character */
- driver_name++;
- } else {
- /* Try using the start of the path */
- driver_name = (char*) info.dli_fname;
- }
-
- /* Make sure the path ends with _dri.so */
- name_len = strlen(driver_name);
- i = name_len - LIB_PATH_SUFFIX_LENGTH;
- if (i < 0 || strcmp(driver_name + i, LIB_PATH_SUFFIX) != 0)
- return;
-
- /* Duplicate the string so we can modify it.
- * So far we've been using info.dli_fname.
- */
- driver_name = strdup(driver_name);
- if (!driver_name)
- return;
-
- /* The path ends with _dri.so. Chop this part of the
- * string off. Then we'll have the driver's final name.
- */
- driver_name[i] = '\0';
-
- i = asprintf(&get_extensions_name, "%s_%s",
- __DRI_DRIVER_GET_EXTENSIONS, driver_name);
- free(driver_name);
- if (i == -1)
- return;
-
- /* dlsym to get the driver's get extensions function. We
- * don't have the dlopen handle, so we have to use
- * RTLD_DEFAULT. It seems unlikely that the symbol will
- * be found in another library, but this isn't optimal.
- */
- get_extensions = dlsym(RTLD_DEFAULT, get_extensions_name);
- free(get_extensions_name);
- if (!get_extensions)
- return;
-
- /* Use the newer DRI loader entrypoint to find extensions.
- * We will then expose these extensions via the older
- * __driDriverExtensions symbol.
- */
- extensions = get_extensions();
-
- /* Copy the extensions into the __driDriverExtensions array
- * we declared.
- */
- for (i = 0; i < ARRAY_SIZE(__driDriverExtensions); i++) {
- __driDriverExtensions[i] = extensions[i];
- if (extensions[i] == NULL)
- break;
- }
-
- /* If the driver had more extensions than we reserved, then
- * bail out.
- */
- if (i == ARRAY_SIZE(__driDriverExtensions)) {
- __driDriverExtensions[0] = NULL;
- fprintf(stderr, "Megadriver stub did not reserve enough extension "
- "slots.\n");
- return;
- }
-}
-
-#endif /* RTLD_DEFAULT && HAVE_DLADDR */
-
-static const
-__DRIconfig **stub_error_init_screen(__DRIscreen *psp)
-{
- fprintf(stderr, "An updated DRI driver loader (libGL.so or X Server) is "
- "required for this Mesa driver.\n");
- return NULL;
-}
-
-/**
- * This is a stub driDriverAPI that is referenced by dri_util.c but should
- * never be used.
- */
-const struct __DriverAPIRec driDriverAPI = {
- .InitScreen = stub_error_init_screen,
-};
projects / platform / upstream / mesa.git / commitdiff