1 /* Copyright © 2013, Intel Corporation
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
35 /* Is the given elf program 32 or 64 bit?
37 * Note: This function returns -1 if 'filename' cannot
38 * be opened as a valid ELF file.
41 elf_bits (const char *filename)
47 fd = open (filename, O_RDONLY, 0);
51 if (elf_version (EV_CURRENT ) == EV_NONE)
54 elf = elf_begin (fd, ELF_C_READ, NULL);
58 if (elf_kind (elf) != ELF_K_ELF)
61 if (gelf_getehdr (elf, &ehdr) == NULL)
64 class = gelf_getclass (elf);
77 open_libgl_handle (void)
79 const char *libgl_path;
84 libgl_path = getenv ("GLAZE_LIBGL");
86 if (libgl_path == NULL) {
90 if (dladdr (open_libgl_handle, &info) == 0) {
91 fprintf (stderr, "Internal error: Failed to lookup filename of glaze library with dladdr.\n");
95 bits = elf_bits (info.dli_fname);
98 libgl_path = getenv ("GLAZE_LIBGL_32_AUTO");
100 libgl_path = getenv ("GLAZE_LIBGL_64_AUTO");
102 if (libgl_path == NULL) {
104 "Error: Failed to detect OpenGL library.\n"
105 "Please set GLAZE_LIBGL to path of real libGL.so\n");
109 setenv ("GLAZE_LIBGL", libgl_path, 1);
113 libgl_handle = dlopen (libgl_path, RTLD_LAZY | RTLD_GLOBAL);
114 if (libgl_handle == NULL) {
115 fprintf (stderr, "glaze_init: Error: Failed to dlopen %s: %s\n",
116 libgl_path, dlerror());
122 open_wrapper_handle (void)
129 path = getenv ("GLAZE_WRAPPER");
131 fprintf (stderr, "GLAZE_WRAPPER unset. Please set to path of real libGL.so under glaze.\n");
136 wrapper_handle = dlopen (path, RTLD_LAZY);
137 if (wrapper_handle == NULL) {
138 const char *error = dlerror();
139 fprintf (stderr, "Error: Failed to dlopen %s: %s\n", path, error);
145 glaze_init (void) __attribute__((constructor));
150 open_libgl_handle ();
151 open_wrapper_handle ();
155 resolve (const char *name)
159 /* The wrapper gets first choice on all symbols. */
160 symbol = dlsym (wrapper_handle, name);
164 return dlsym (libgl_handle, name);
167 #define GLAZE_API(name) \
168 void * name() __attribute__((ifunc(#name "_resolver"))); \
170 name ## _resolver (void) { return resolve (#name); }
172 #include "specs/gl.def"
173 #include "specs/glx.def"