-DEVICE *init_dev(DEVICE *dev, DEVRES *device);
-int open_dev(DEVICE *dev, char *VolName, int mode);
-void close_dev(DEVICE *dev);
-void force_close_dev(DEVICE *dev);
-int truncate_dev(DEVICE *dev);
-void term_dev(DEVICE *dev);
-char * strerror_dev(DEVICE *dev);
-void clrerror_dev(DEVICE *dev, int func);
-int update_pos_dev(DEVICE *dev);
-int rewind_dev(DEVICE *dev);
-int load_dev(DEVICE *dev);
-int offline_dev(DEVICE *dev);
-int flush_dev(DEVICE *dev);
-int weof_dev(DEVICE *dev, int num);
-int write_block(DEVICE *dev);
-int write_dev(DEVICE *dev, char *buf, size_t len);
-int read_dev(DEVICE *dev, char *buf, size_t len);
-int status_dev(DEVICE *dev, uint32_t *status);
-int eod_dev(DEVICE *dev);
-int fsf_dev(DEVICE *dev, int num);
-int fsr_dev(DEVICE *dev, int num);
-int bsf_dev(DEVICE *dev, int num);
-int bsr_dev(DEVICE *dev, int num);
-void attach_jcr_to_device(DEVICE *dev, JCR *jcr);
-void detach_jcr_from_device(DEVICE *dev, JCR *jcr);
-JCR *next_attached_jcr(DEVICE *dev, JCR *jcr);
+DEVICE *init_dev(DEVICE *dev, DEVRES *device);
+int open_dev(DEVICE *dev, char *VolName, int mode);
+void close_dev(DEVICE *dev);
+void force_close_dev(DEVICE *dev);
+bool truncate_dev(DEVICE *dev);
+void term_dev(DEVICE *dev);
+char * strerror_dev(DEVICE *dev);
+void clrerror_dev(DEVICE *dev, int func);
+bool update_pos_dev(DEVICE *dev);
+int rewind_dev(DEVICE *dev);
+bool load_dev(DEVICE *dev);
+bool offline_dev(DEVICE *dev);
+int flush_dev(DEVICE *dev);
+int weof_dev(DEVICE *dev, int num);
+int write_block(DEVICE *dev);
+int write_dev(DEVICE *dev, char *buf, size_t len);
+int read_dev(DEVICE *dev, char *buf, size_t len);
+uint32_t status_dev(DEVICE *dev);
+int eod_dev(DEVICE *dev);
+bool fsf_dev(DEVICE *dev, int num);
+bool fsr_dev(DEVICE *dev, int num);
+bool bsf_dev(DEVICE *dev, int num);
+bool bsr_dev(DEVICE *dev, int num);
+void attach_jcr_to_device(DEVICE *dev, JCR *jcr);
+void detach_jcr_from_device(DEVICE *dev, JCR *jcr);
+JCR *next_attached_jcr(DEVICE *dev, JCR *jcr);
+bool dev_can_write(DEVICE *dev);
+int offline_or_rewind_dev(DEVICE *dev);
+bool reposition_dev(DEVICE *dev, uint32_t file, uint32_t block);
+void init_dev_wait_timers(DEVICE *dev);
+bool double_dev_wait_time(DEVICE *dev);