PREV UP NEXT The Ftape Installation and Usage Guide


8.8.1.11: MTBSFM

C code
struct mtop op = { MTBSFM, COUNT };
result = ioctl(tapefd, MTIOCTOP, &op);

Description

Backward space over COUNT file marks. The tape is positioned at the the BOT (Begin Of Tape) side of the last skipped file mark.


Notes

`mt -f /dev/qft0 bsfm' (i.e. COUNT set to `1') positions at the end of the previous volume which indeed is just was `position at the BOT side of the last skipped file mark' means if only one file mark has been skipped.


Limitations

With ftape-3.04d (and later versions) it is nevertheless impossible to use MTBSFM to append data to a tape volume. Since version 3.03 all write access to the tape is illegal unless the tape is located at either BOT (Begin Of Tape) or EOD (End Of Data, end of the area that already is occupied by data). EOD is defined to be the location after the last file mark.


Example

skip to end of the previous tape volume

mt -f /dev/nqft0 bsfm

References
File marks.
MTFSFM.
Rewinding devices and tape motion commands.
MTFSF.
MTBSF.
MTWEOF.

ftape logo Use these buttons to jump to the top menu

TOP (previous node) TOP (parent node) TOP (next node) TOP (this node)