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authormarha <marha@users.sourceforge.net>2013-12-22 13:12:15 +0100
committermarha <marha@users.sourceforge.net>2013-12-22 13:16:58 +0100
commit1d03b6f684ab1ea6772f00058605a9ebb2910628 (patch)
tree8b393bd59900eba6aa9010cab9e714922cac2536 /mesalib/src/mesa/drivers/dri/common/megadriver_stub.c
parent5567cf1befbda64f2dc6fae1d337567cd984b46e (diff)
parentc81020559f329a516191927222b3698ba7370aca (diff)
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Merge remote-tracking branch 'origin/released'
* origin/released: libxtrans fontconfig glproto libX11 libxcb xcbproto mesa xserver pixman xkeyboard-config git update 22 Dec 2013 Conflicts: mesalib/include/GL/glext.h mesalib/src/mesa/drivers/dri/common/dri_util.c mesalib/src/mesa/drivers/dri/swrast/swrast.c xorg-server/damageext/damageext.c xorg-server/dix/dispatch.c xorg-server/glx/glxdriswrast.c xorg-server/glx/indirect_dispatch.c xorg-server/glx/indirect_dispatch_swap.c xorg-server/glx/indirect_program.c xorg-server/glx/render2.c xorg-server/glx/render2swap.c xorg-server/hw/xwin/glx/gen_gl_wrappers.py xorg-server/hw/xwin/glx/glthunk.c xorg-server/hw/xwin/glx/indirect.c xorg-server/include/os.h xorg-server/present/present_request.c
Diffstat (limited to 'mesalib/src/mesa/drivers/dri/common/megadriver_stub.c')
-rw-r--r--mesalib/src/mesa/drivers/dri/common/megadriver_stub.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/mesalib/src/mesa/drivers/dri/common/megadriver_stub.c b/mesalib/src/mesa/drivers/dri/common/megadriver_stub.c
index 3a33d74ab..5664af4da 100644
--- a/mesalib/src/mesa/drivers/dri/common/megadriver_stub.c
+++ b/mesalib/src/mesa/drivers/dri/common/megadriver_stub.c
@@ -23,6 +23,132 @@
#include <stdio.h>
#include "dri_util.h"
+#include <dlfcn.h>
+#include "main/macros.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 are only defined when _GNU_SOURCE is
+ * defined.)
+ */
+#ifdef _GNU_SOURCE
+
+#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 /* _GNU_SOURCE */
static const
__DRIconfig **stub_error_init_screen(__DRIscreen *psp)