MFS CHGFILEPTR: Difference between revisions
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The file system may want to take the seek operation as a hint that an I/O operation is about to take place at the new position and initiate a positioning operation on sequential access media or read-ahead operation on other media. | The file system may want to take the seek operation as a hint that an I/O operation is about to take place at the new position and initiate a positioning operation on sequential access media or read-ahead operation on other media. | ||
== | ==Calling Sequence== | ||
<PRE> | <PRE> | ||
int far pascal MFS_CHGFILEPTR(offset, type) | int far pascal MFS_CHGFILEPTR(offset, type) | ||
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unsigned short type; | unsigned short type; | ||
</PRE> | </PRE> | ||
[[Category:IFS Interfaces]] | |||
Latest revision as of 05:42, 17 February 2020
Move the file's logical read position pointer.
Syntax
int far pascal MFS_CHGFILEPTR(offset, type)
Parameters
- offset
- is the signed offset which depending on the type parameter is used to determine the new position within the file.
- type
- indicates the basis of a seek operation.
- 0 indicates seek relative to beginning of file.
- 1 indicates seek relative to current position within the file.
- 2 indicates seek relative to end of file.
Returns
- 0
- If no error is detected, a zero error code is returned.
- non-zero
- If an error is detected, a non-zero error code is returned.
Remarks
The file system may want to take the seek operation as a hint that an I/O operation is about to take place at the new position and initiate a positioning operation on sequential access media or read-ahead operation on other media.
Calling Sequence
int far pascal MFS_CHGFILEPTR(offset, type) long offset; unsigned short type;