+#else /* _EGL_PLATFORM_POSIX */
+ /* stop immediately */
+ return EGL_FALSE;
+#endif
+}
+
+
+/**
+ * Run the preload function on each driver directory and return the number of
+ * drivers loaded.
+ *
+ * The process may end prematurely if the callback function returns false.
+ */
+static EGLint
+_eglPreloadForEach(const char *search_path,
+ EGLBoolean (*loader)(const char *, size_t, void *),
+ void *loader_data)
+{
+ const char *cur, *next;
+ size_t len;
+ EGLint num_drivers = _eglGlobal.NumDrivers;
+
+ cur = search_path;
+ while (cur) {
+ next = strchr(cur, ':');
+ len = (next) ? next - cur : strlen(cur);
+
+ if (!loader(cur, len, loader_data))
+ break;
+
+ cur = (next) ? next + 1 : NULL;
+ }
+
+ return (_eglGlobal.NumDrivers - num_drivers);
+}
+
+
+/**
+ * Return a list of colon-separated driver directories.
+ */
+static const char *
+_eglGetSearchPath(void)
+{
+ static const char *search_path;
+
+#if defined(_EGL_PLATFORM_POSIX) || defined(_EGL_PLATFORM_WINDOWS)
+ if (!search_path) {
+ static char buffer[1024];
+ const char *p;
+ int ret;
+
+ p = getenv("EGL_DRIVERS_PATH");
+#if defined(_EGL_PLATFORM_POSIX)
+ if (p && (geteuid() != getuid() || getegid() != getgid())) {
+ _eglLog(_EGL_DEBUG,
+ "ignore EGL_DRIVERS_PATH for setuid/setgid binaries");
+ p = NULL;
+ }
+#endif /* _EGL_PLATFORM_POSIX */
+
+ if (p) {
+ ret = snprintf(buffer, sizeof(buffer),
+ "%s:%s", p, _EGL_DRIVER_SEARCH_DIR);
+ if (ret > 0 && ret < sizeof(buffer))
+ search_path = buffer;
+ }
+ }
+ if (!search_path)
+ search_path = _EGL_DRIVER_SEARCH_DIR;
+#else
+ search_path = "";
+#endif
+
+ return search_path;