2 Bacula® - The Network Backup Solution
4 Copyright (C) 2000-2008 Free Software Foundation Europe e.V.
6 The main author of Bacula is Kern Sibbald, with contributions from
7 many others, a complete list can be found in the file AUTHORS.
8 This program is Free Software; you can redistribute it and/or
9 modify it under the terms of version two of the GNU General Public
10 License as published by the Free Software Foundation and included
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 Bacula® is a registered trademark of John Walker.
24 The licensor of Bacula is the Free Software Foundation Europe
25 (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
26 Switzerland, email:ftf@fsfeurope.org.
29 * Definitions for using the Device functions in Bacula
30 * Tape and File storage access
39 * Some details of how volume and device reservations work
42 * set_in_use() volume being used on current drive
43 * clear_in_use() no longer being used. Can be re-used or moved.
44 * set_swapping() set volume being moved to another drive
45 * is_swapping() volume is being moved to another drive
46 * clear_swapping() volume normal
49 * set_load() set to load volume
50 * needs_load() volume must be loaded (i.e. set_load done)
51 * clear_load() load done.
52 * set_unload() set to unload volume
53 * needs_unload() volume must be unloaded
54 * clear_unload() volume unloaded
56 * reservations are temporary until the drive is acquired
57 * inc_reserved() increments num of reservations
58 * dec_reserved() decrements num of reservations
59 * num_reserved() number of reservations
62 * set_reserved() sets local reserve flag and calls dev->inc_reserved()
63 * clear_reserved() clears local reserve flag and calls dev->dec_reserved()
64 * is_reserved() returns local reserved flag
65 * unreserve_device() much more complete unreservation
73 #undef DCR /* used by Bacula */
75 /* Return values from wait_for_sysop() */
84 /* Arguments to open_dev() */
86 CREATE_READ_WRITE = 1,
101 /* Generic status bits returned from status_dev() */
102 #define BMT_TAPE (1<<0) /* is tape device */
103 #define BMT_EOF (1<<1) /* just read EOF */
104 #define BMT_BOT (1<<2) /* at beginning of tape */
105 #define BMT_EOT (1<<3) /* end of tape reached */
106 #define BMT_SM (1<<4) /* DDS setmark */
107 #define BMT_EOD (1<<5) /* DDS at end of data */
108 #define BMT_WR_PROT (1<<6) /* tape write protected */
109 #define BMT_ONLINE (1<<7) /* tape online */
110 #define BMT_DR_OPEN (1<<8) /* tape door open */
111 #define BMT_IM_REP_EN (1<<9) /* immediate report enabled */
114 /* Bits for device capabilities */
115 #define CAP_EOF (1<<0) /* has MTWEOF */
116 #define CAP_BSR (1<<1) /* has MTBSR */
117 #define CAP_BSF (1<<2) /* has MTBSF */
118 #define CAP_FSR (1<<3) /* has MTFSR */
119 #define CAP_FSF (1<<4) /* has MTFSF */
120 #define CAP_EOM (1<<5) /* has MTEOM */
121 #define CAP_REM (1<<6) /* is removable media */
122 #define CAP_RACCESS (1<<7) /* is random access device */
123 #define CAP_AUTOMOUNT (1<<8) /* Read device at start to see what is there */
124 #define CAP_LABEL (1<<9) /* Label blank tapes */
125 #define CAP_ANONVOLS (1<<10) /* Mount without knowing volume name */
126 #define CAP_ALWAYSOPEN (1<<11) /* always keep device open */
127 #define CAP_AUTOCHANGER (1<<12) /* AutoChanger */
128 #define CAP_OFFLINEUNMOUNT (1<<13) /* Offline before unmount */
129 #define CAP_STREAM (1<<14) /* Stream device */
130 #define CAP_BSFATEOM (1<<15) /* Backspace file at EOM */
131 #define CAP_FASTFSF (1<<16) /* Fast forward space file */
132 #define CAP_TWOEOF (1<<17) /* Write two eofs for EOM */
133 #define CAP_CLOSEONPOLL (1<<18) /* Close device on polling */
134 #define CAP_POSITIONBLOCKS (1<<19) /* Use block positioning */
135 #define CAP_MTIOCGET (1<<20) /* Basic support for fileno and blkno */
136 #define CAP_REQMOUNT (1<<21) /* Require mount to read files back (typically: DVD) */
137 #define CAP_CHECKLABELS (1<<22) /* Check for ANSI/IBM labels */
140 #define dev_state(dev, st_state) ((dev)->state & (st_state))
142 /* Device state bits */
143 #define ST_XXXXXX (1<<0) /* was ST_OPENED */
144 #define ST_XXXXX (1<<1) /* was ST_TAPE */
145 #define ST_XXXX (1<<2) /* was ST_FILE */
146 #define ST_XXX (1<<3) /* was ST_FIFO */
147 #define ST_XX (1<<4) /* was ST_DVD */
148 #define ST_X (1<<5) /* was ST_PROG */
150 #define ST_LABEL (1<<6) /* label found */
151 #define ST_MALLOC (1<<7) /* dev packet malloc'ed in init_dev() */
152 #define ST_APPEND (1<<8) /* ready for Bacula append */
153 #define ST_READ (1<<9) /* ready for Bacula read */
154 #define ST_EOT (1<<10) /* at end of tape */
155 #define ST_WEOT (1<<11) /* Got EOT on write */
156 #define ST_EOF (1<<12) /* Read EOF i.e. zero bytes */
157 #define ST_NEXTVOL (1<<13) /* Start writing on next volume */
158 #define ST_SHORT (1<<14) /* Short block read */
159 #define ST_MOUNTED (1<<15) /* the device is mounted to the mount point */
160 #define ST_MEDIA (1<<16) /* Media found in mounted device */
161 #define ST_OFFLINE (1<<17) /* set offline by operator */
162 #define ST_PART_SPOOLED (1<<18) /* spooling part */
163 #define ST_FREESPACE_OK (1<<19) /* Have valid freespace for DVD */
166 /* Volume Catalog Information structure definition */
167 struct VOLUME_CAT_INFO {
168 /* Media info for the current Volume */
169 uint32_t VolCatJobs; /* number of jobs on this Volume */
170 uint32_t VolCatFiles; /* Number of files */
171 uint32_t VolCatBlocks; /* Number of blocks */
172 uint64_t VolCatBytes; /* Number of bytes written */
173 uint32_t VolCatParts; /* Number of parts written */
174 uint32_t VolCatMounts; /* Number of mounts this volume */
175 uint32_t VolCatErrors; /* Number of errors this volume */
176 uint32_t VolCatWrites; /* Number of writes this volume */
177 uint32_t VolCatReads; /* Number of reads this volume */
178 uint64_t VolCatRBytes; /* Number of bytes read */
179 uint32_t VolCatRecycles; /* Number of recycles this volume */
180 uint32_t EndFile; /* Last file number */
181 uint32_t EndBlock; /* Last block number */
182 int32_t LabelType; /* Bacula/ANSI/IBM */
183 int32_t Slot; /* >0=Slot loaded, 0=nothing, -1=unknown */
184 uint32_t VolCatMaxJobs; /* Maximum Jobs to write to volume */
185 uint32_t VolCatMaxFiles; /* Maximum files to write to volume */
186 uint64_t VolCatMaxBytes; /* Max bytes to write to volume */
187 uint64_t VolCatCapacityBytes; /* capacity estimate */
188 btime_t VolReadTime; /* time spent reading */
189 btime_t VolWriteTime; /* time spent writing this Volume */
190 int64_t VolMediaId; /* MediaId */
191 utime_t VolFirstWritten; /* Time of first write */
192 utime_t VolLastWritten; /* Time of last write */
193 bool InChanger; /* Set if vol in current magazine */
194 char VolCatStatus[20]; /* Volume status */
195 char VolCatName[MAX_NAME_LENGTH]; /* Desired volume to mount */
199 class DEVRES; /* Device resource defined in stored_conf.h */
201 class DCR; /* forward reference */
202 class VOLRES; /* forward reference */
206 * Device structure definition. There is one of these for
207 * each physical device. Everything here is "global" to
208 * that device and effects all jobs using the device.
212 int m_fd; /* file descriptor */
213 int m_blocked; /* set if we must wait (i.e. change tape) */
214 int m_count; /* Mutex use count -- DEBUG only */
215 pthread_t m_pid; /* Thread that locked -- DEBUG only */
216 bool m_unload; /* set when Volume must be unloaded */
217 bool m_load; /* set when Volume must be loaded */
218 int m_num_reserved; /* counter of device reservations */
220 DEVICE * volatile swap_dev; /* Swap vol from this device */
221 dlist *attached_dcrs; /* attached DCR list */
222 pthread_mutex_t m_mutex; /* access control */
223 pthread_mutex_t spool_mutex; /* mutex for updating spool_size */
224 pthread_cond_t wait; /* thread wait variable */
225 pthread_cond_t wait_next_vol; /* wait for tape to be mounted */
226 pthread_t no_wait_id; /* this thread must not wait */
227 int dev_prev_blocked; /* previous blocked state */
228 int num_waiting; /* number of threads waiting */
229 int num_writers; /* number of writing threads */
230 int capabilities; /* capabilities mask */
231 int state; /* state mask */
232 int dev_errno; /* Our own errno */
233 int mode; /* read/write modes */
234 int openmode; /* parameter passed to open_dev (useful to reopen the device) */
235 int dev_type; /* device type */
236 bool autoselect; /* Autoselect in autochanger */
237 bool initiated; /* set when init_dev() called */
238 int label_type; /* Bacula/ANSI/IBM label types */
239 uint32_t drive_index; /* Autochanger drive index (base 0) */
240 int32_t Slot; /* Slot currently in drive (base 1) */
241 POOLMEM *dev_name; /* Physical device name */
242 POOLMEM *prt_name; /* Name used for display purposes */
243 char *errmsg; /* nicely edited error message */
244 uint32_t block_num; /* current block number base 0 */
245 uint32_t file; /* current file number base 0 */
246 uint64_t file_addr; /* Current file read/write address */
247 uint64_t file_size; /* Current file size */
248 uint32_t EndBlock; /* last block written */
249 uint32_t EndFile; /* last file written */
250 uint32_t min_block_size; /* min block size */
251 uint32_t max_block_size; /* max block size */
252 uint64_t max_volume_size; /* max bytes to put on one volume */
253 uint64_t max_file_size; /* max file size to put in one file on volume */
254 uint64_t volume_capacity; /* advisory capacity */
255 uint64_t max_spool_size; /* maximum spool file size */
256 uint64_t spool_size; /* current spool size for this device */
257 uint32_t max_rewind_wait; /* max secs to allow for rewind */
258 uint32_t max_open_wait; /* max secs to allow for open */
259 uint32_t max_open_vols; /* max simultaneous open volumes */
261 uint64_t max_part_size; /* max part size */
262 uint64_t part_size; /* current part size */
263 uint32_t part; /* current part number (starts at 0) */
264 uint64_t part_start; /* current part start address (relative to the whole volume) */
265 uint32_t num_dvd_parts; /* number of parts WRITTEN on the DVD */
266 /* state ST_FREESPACE_OK is set if free_space is valid */
267 uint64_t free_space; /* current free space on medium (without the current part) */
268 int free_space_errno; /* indicates errno getting freespace */
269 bool truncating; /* if set, we are currently truncating the DVD */
270 bool blank_dvd; /* if set, we have a blank DVD in the drive */
273 utime_t vol_poll_interval; /* interval between polling Vol mount */
274 DEVRES *device; /* pointer to Device Resource */
275 VOLRES *vol; /* Pointer to Volume reservation item */
276 btimer_t *tid; /* timer id */
278 VOLUME_CAT_INFO VolCatInfo; /* Volume Catalog Information */
279 VOLUME_LABEL VolHdr; /* Actual volume label */
280 char pool_name[MAX_NAME_LENGTH]; /* pool name */
281 char pool_type[MAX_NAME_LENGTH]; /* pool type */
283 /* Device wait times ***FIXME*** look at durations */
284 char BadVolName[MAX_NAME_LENGTH]; /* Last wrong Volume mounted */
285 bool poll; /* set to poll Volume */
293 btime_t last_timer; /* used by read/write/seek to get stats (usec) */
294 btime_t last_tick; /* contains last read/write time (usec) */
297 btime_t DevWriteTime;
298 uint64_t DevWriteBytes;
299 uint64_t DevReadBytes;
302 btime_t get_timer_count(); /* return the last timer interval (ms) */
304 int has_cap(int cap) const { return capabilities & cap; }
305 void clear_cap(int cap) { capabilities &= ~cap; }
306 void set_cap(int cap) { capabilities |= cap; }
307 int is_autochanger() const { return capabilities & CAP_AUTOCHANGER; }
308 int requires_mount() const { return capabilities & CAP_REQMOUNT; }
309 int is_removable() const { return capabilities & CAP_REM; }
310 int is_tape() const { return dev_type == B_TAPE_DEV; }
311 int is_file() const { return dev_type == B_FILE_DEV; }
312 int is_fifo() const { return dev_type == B_FIFO_DEV; }
313 int is_dvd() const { return dev_type == B_DVD_DEV; }
314 int is_vtl() const { return dev_type == B_VTL_DEV; }
315 int is_open() const { return m_fd >= 0; }
316 int is_offline() const { return state & ST_OFFLINE; }
317 int is_labeled() const { return state & ST_LABEL; }
318 int is_mounted() const { return state & ST_MOUNTED; }
319 int is_unmountable() const { return (is_dvd() || (is_file() && is_removable())); }
320 int num_reserved() const { return m_num_reserved; };
321 int is_part_spooled() const { return state & ST_PART_SPOOLED; }
322 int have_media() const { return state & ST_MEDIA; }
323 int is_short_block() const { return state & ST_SHORT; }
324 int is_busy() const { return (state & ST_READ) || num_writers || num_reserved(); }
325 int at_eof() const { return state & ST_EOF; }
326 int at_eot() const { return state & ST_EOT; }
327 int at_weot() const { return state & ST_WEOT; }
328 int can_append() const { return state & ST_APPEND; }
329 int is_freespace_ok() const { return state & ST_FREESPACE_OK; }
331 * can_write() is meant for checking at the end of a job to see
332 * if we still have a tape (perhaps not if at end of tape
333 * and the job is canceled).
335 int can_write() const { return is_open() && can_append() &&
336 is_labeled() && !at_weot(); }
337 int can_read() const { return state & ST_READ; }
338 bool can_steal_lock() const { return m_blocked &&
339 (m_blocked == BST_UNMOUNTED ||
340 m_blocked == BST_WAITING_FOR_SYSOP ||
341 m_blocked == BST_UNMOUNTED_WAITING_FOR_SYSOP); };
342 bool waiting_for_mount() const { return
343 (m_blocked == BST_UNMOUNTED ||
344 m_blocked == BST_WAITING_FOR_SYSOP ||
345 m_blocked == BST_UNMOUNTED_WAITING_FOR_SYSOP); };
346 bool must_unload() const { return m_unload; };
347 bool must_load() const { return m_load; };
348 const char *strerror() const;
349 const char *archive_name() const;
350 const char *name() const;
351 const char *print_name() const; /* Name for display purposes */
352 void set_ateof(); /* in dev.c */
353 void set_ateot(); /* in dev.c */
354 void set_eot() { state |= ST_EOT; };
355 void set_eof() { state |= ST_EOF; };
356 void set_append() { state |= ST_APPEND; };
357 void set_labeled() { state |= ST_LABEL; };
358 inline void set_read() { state |= ST_READ; };
359 void set_offline() { state |= ST_OFFLINE; };
360 void set_mounted() { state |= ST_MOUNTED; };
361 void set_media() { state |= ST_MEDIA; };
362 void set_short_block() { state |= ST_SHORT; };
363 void set_freespace_ok() { state |= ST_FREESPACE_OK; }
364 void set_part_spooled(int val) { if (val) state |= ST_PART_SPOOLED; \
365 else state &= ~ST_PART_SPOOLED;
367 void set_unload() { m_unload = true; };
368 void set_load() { m_load = true; };
369 void inc_reserved() { m_num_reserved++; }
370 void set_mounted(int val) { if (val) state |= ST_MOUNTED; \
371 else state &= ~ST_MOUNTED; };
372 void dec_reserved() { m_num_reserved--; ASSERT(m_num_reserved>=0); };
373 void clear_append() { state &= ~ST_APPEND; };
374 void clear_read() { state &= ~ST_READ; };
375 void clear_labeled() { state &= ~ST_LABEL; };
376 void clear_offline() { state &= ~ST_OFFLINE; };
377 void clear_eot() { state &= ~ST_EOT; };
378 void clear_eof() { state &= ~ST_EOF; };
379 void clear_opened() { m_fd = -1; };
380 void clear_mounted() { state &= ~ST_MOUNTED; };
381 void clear_media() { state &= ~ST_MEDIA; };
382 void clear_short_block() { state &= ~ST_SHORT; };
383 void clear_freespace_ok() { state &= ~ST_FREESPACE_OK; };
384 void clear_unload() { m_unload = false; };
385 void clear_load() { m_load = false; };
386 char *bstrerror(void) { return errmsg; };
387 char *print_errmsg() { return errmsg; };
390 void clear_volhdr(); /* in dev.c */
391 void close(); /* in dev.c */
392 void close_part(DCR *dcr); /* in dev.c */
393 bool truncate(DCR *dcr); /* in dev.c */
394 int open(DCR *dcr, int mode); /* in dev.c */
395 void term(void); /* in dev.c */
396 ssize_t read(void *buf, size_t len); /* in dev.c */
397 ssize_t write(const void *buf, size_t len); /* in dev.c */
398 bool rewind(DCR *dcr); /* in dev.c */
399 bool mount(int timeout); /* in dev.c */
400 bool unmount(int timeout); /* in dev.c */
401 void edit_mount_codes(POOL_MEM &omsg, const char *imsg); /* in dev.c */
402 bool offline_or_rewind(); /* in dev.c */
403 bool offline(); /* in dev.c */
404 bool bsf(int count); /* in dev.c */
405 bool eod(DCR *dcr); /* in dev.c */
406 bool fsr(int num); /* in dev.c */
407 bool fsf(int num); /* in dev.c */
408 bool bsr(int num); /* in dev.c */
409 bool weof(int num); /* in dev.c */
410 void lock_door(); /* in dev.c */
411 void unlock_door(); /* in dev.c */
412 int32_t get_os_tape_file(); /* in dev.c */
413 bool scan_dir_for_volume(DCR *dcr); /* in scan.c */
414 bool reposition(DCR *dcr, uint32_t rfile, uint32_t rblock); /* in dev.c */
415 void clrerror(int func); /* in dev.c */
416 boffset_t lseek(DCR *dcr, boffset_t offset, int whence); /* in dev.c */
417 bool update_pos(DCR *dcr); /* in dev.c */
418 bool update_freespace(); /* in dvd.c */
420 uint32_t get_file() const { return file; };
421 uint32_t get_block_num() const { return block_num; };
422 int fd() const { return m_fd; };
425 * Locking and blocking calls
428 void _r_dlock(const char *, int); /* in lock.c */
429 void _r_dunlock(const char *, int); /* in lock.c */
430 void _dlock(const char *, int); /* in lock.c */
431 void _dunlock(const char *, int); /* in lock.c */
433 void r_dlock(); /* in lock.c */
434 void r_dunlock() { dunlock(); }
435 void dlock() { P(m_mutex); }
436 void dunlock() { V(m_mutex); }
438 void dblock(int why); /* in lock.c */
439 void dunblock(bool locked=false); /* in lock.c */
440 void set_blocked(int block) { m_blocked = block; };
441 int blocked() const { return m_blocked; };
442 bool is_blocked() const { return m_blocked != BST_NOT_BLOCKED; };
443 const char *print_blocked() const; /* in dev.c */
446 bool do_mount(int mount, int timeout); /* in dev.c */
447 void set_mode(int omode); /* in dev.c */
448 void open_tape_device(DCR *dcr, int omode); /* in dev.c */
449 void open_file_device(DCR *dcr, int omode); /* in dev.c */
450 void open_dvd_device(DCR *dcr, int omode); /* in dev.c */
453 inline const char *DEVICE::strerror() const { return errmsg; }
454 inline const char *DEVICE::archive_name() const { return dev_name; }
455 inline const char *DEVICE::print_name() const { return prt_name; }
458 * Device Context (or Control) Record.
459 * There is one of these records for each Job that is using
460 * the device. Items in this record are "local" to the Job and
461 * do not affect other Jobs. Note, a job can have multiple
462 * DCRs open, each pointing to a different device.
466 bool m_dev_locked; /* set if dev already locked */
467 bool m_reserved; /* set if reserved device */
468 bool m_found_in_use; /* set if a volume found in use */
471 dlink dev_link; /* link to attach to dev */
472 JCR *jcr; /* pointer to JCR */
473 DEVICE * volatile dev; /* pointer to device */
474 DEVRES *device; /* pointer to device resource */
475 DEV_BLOCK *block; /* pointer to block */
476 DEV_RECORD *rec; /* pointer to record */
477 pthread_t tid; /* Thread running this dcr */
478 int spool_fd; /* fd if spooling */
479 bool spool_data; /* set to spool data */
480 bool spooling; /* set when actually spooling */
481 bool despooling; /* set when despooling */
482 bool despool_wait; /* waiting for despooling */
483 bool NewVol; /* set if new Volume mounted */
484 bool WroteVol; /* set if Volume written */
485 bool NewFile; /* set when EOF written */
486 bool reserved_volume; /* set if we reserved a volume */
487 bool any_volume; /* Any OK for dir_find_next... */
488 bool attached_to_dev; /* set when attached to dev */
489 bool keep_dcr; /* do not free dcr in release_dcr */
490 uint32_t VolFirstIndex; /* First file index this Volume */
491 uint32_t VolLastIndex; /* Last file index this Volume */
492 uint32_t FileIndex; /* Current File Index */
493 uint32_t EndFile; /* End file written */
494 uint32_t StartFile; /* Start write file */
495 uint32_t StartBlock; /* Start write block */
496 uint32_t EndBlock; /* Ending block written */
497 int64_t VolMediaId; /* MediaId */
498 int64_t job_spool_size; /* Current job spool size */
499 int64_t max_job_spool_size; /* Max job spool size */
500 char VolumeName[MAX_NAME_LENGTH]; /* Volume name */
501 char pool_name[MAX_NAME_LENGTH]; /* pool name */
502 char pool_type[MAX_NAME_LENGTH]; /* pool type */
503 char media_type[MAX_NAME_LENGTH]; /* media type */
504 char dev_name[MAX_NAME_LENGTH]; /* dev name */
505 int Copy; /* identical copy number */
506 int Stripe; /* RAIT stripe */
507 VOLUME_CAT_INFO VolCatInfo; /* Catalog info for desired volume */
510 bool found_in_use() const { return m_found_in_use; };
511 void set_found_in_use() { m_found_in_use = true; };
512 void clear_found_in_use() { m_found_in_use = false; };
513 bool is_reserved() const { return m_reserved; };
514 bool is_dev_locked() { return m_dev_locked; }
515 void dlock() { dev->dlock(); m_dev_locked = true; }
516 void dunlock() { m_dev_locked = false; dev->dunlock(); }
517 void dblock(int why) { dev->dblock(why); }
520 /* Methods in reserve.c */
521 void clear_reserved();
523 void unreserve_device();
524 bool can_i_use_volume();
526 /* Methods in mount.c */
527 bool mount_next_write_volume();
528 bool mount_next_read_volume();
529 void mark_volume_in_error();
530 void mark_volume_not_inchanger();
531 int try_autolabel(bool opened);
532 bool is_suitable_volume_mounted();
534 int check_volume_label(bool &ask, bool &autochanger);
535 void release_volume();
540 * Volume reservation class -- see reserve.c
543 bool m_swapping; /* set when swapping to another drive */
544 bool m_in_use; /* set when volume reserved or in use */
545 int32_t m_slot; /* slot of swapping volume */
548 char *vol_name; /* Volume name */
549 DEVICE *dev; /* Pointer to device to which we are attached */
551 bool is_swapping() const { return m_swapping; };
552 void set_swapping() { m_swapping = true; };
553 void clear_swapping() { m_swapping = false; };
554 bool is_in_use() const { return m_in_use; };
555 void set_in_use() { m_in_use = true; };
556 void clear_in_use() { m_in_use = false; };
557 void set_slot(int32_t slot) { m_slot = slot; };
558 int32_t get_slot() const { return m_slot; };
562 /* Get some definition of function to position
563 * to the end of the medium in MTEOM. System
564 * dependent. Arrgggg!