+#define strfieldcpy(to, from) \
+do { \
+ to[sizeof(to)-1] = '\0'; \
+ strncpy(to, from, sizeof(to)-1); \
+} while (0)
+
+extern int udev_add_device(char *path, char *subsystem);
+extern int udev_remove_device(char *path, char *subsystem);
+
+extern char **main_argv;
+extern char **main_envp;
+extern char sysfs_path[SYSFS_PATH_MAX];
+extern char *udev_config_dir;
+extern char *udev_root;
+extern char udev_db_filename[PATH_MAX+NAME_MAX];
+extern char udev_config_permission_filename[PATH_MAX+NAME_MAX];
+extern char udev_config_filename[PATH_MAX+NAME_MAX];