FS_TRUNCATE/IOF_TRNC
This trap truncates a file to the current position.
Call Parameters | Return Parameters | ||
---|---|---|---|
D0.B | $4B | D0.L | Error return. |
D1.L | D1.L | Corrupted. | |
D3.W | Timeout | D3.L | Preserved. |
A0.L | Channel ID | A0.L | Preserved. |
A1.L | A1.L | Corrupted. |
Errors
Any sub system IO errors including
ERR_NC | Not complete. |
Notes
- All registers not shown above are not used on entry and are preserved on exit.
Example
The example below shows the use of this trap call to truncate a file to the position set in D1.L. It is assumed that A0 contains the file's ID.
trnc moveq #fs_posab,d0 ; $42 moveq #-1,d3 ; Timeout trap #3 ; Set the position tst.l d0 ; OK? . . bne error ; . . no! moveq #fs_truncate,d0 ; $4B trap #3 ; Truncate tst.l d0 ; OK? . . bne error ; . . no!