dio_truncate(3) [php man page]

DIO_TRUNCATE(3) 							 1							   DIO_TRUNCATE(3)

dio_truncate - Truncates file descriptor fd to offset bytes

SYNOPSIS

       bool dio_truncate (resource  $fd, int  $offset)

DESCRIPTION

       dio_truncate(3) truncates a file to at most $offset bytes in size.

	If  the  file  previously was larger than this size, the extra data is lost. If the file previously was shorter, it is unspecified whether
       the file is left unchanged or is extended. In the latter case the extended part reads as zero bytes.

PARAMETERS

	      o $fd
		- The file descriptor returned by dio_open(3).

	      o $offset
		- The offset in bytes.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

NOTES

       Note

	      This function is not implemented on Windows platforms.

PHP Documentation Group 													   DIO_TRUNCATE(3)

EIO_SEEK(3)								 1							       EIO_SEEK(3)

eio_seek - Repositions the offset of the open file associated with the$fdargument to the argument$offsetaccording to the directive$whence

SYNOPSIS

       resource  eio_seek  (mixed   $fd,  int  $offset, int  $whence, [int  $pri = EIO_PRI_DEFAULT], [callable	$callback = NULL], [mixed  $data =
       NULL])

DESCRIPTION

       eio_seek(3) repositions the offset of the open file associated with stream, Socket resource, or file descriptor specified  by  $fd  to  the
       argument $offset according to the directive $whence as follows:

	      o EIO_SEEK_SET - Set position equal to $offset bytes.

	      o EIO_SEEK_CUR - Set position to current location plus $offset.

	      o EIO_SEEK_END - Set position to end-of-file plus $offset.

PARAMETERS

	      o $fd
		- Stream, Socket resource, or numeric file descriptor

	      o $offset
		- Starting point from which data is to be read.

	      o $length
		- Number of bytes to be read.

	      o $pri
		-The  request  priority:  EIO_PRI_DEFAULT,  EIO_PRI_MIN,  EIO_PRI_MAX,	or  NULL.  If  NULL  passed,  $pri  internally	is  set to
		EIO_PRI_DEFAULT.

	      o $callback
		-$callback function is called when the request is done. It should match the following prototype:

	      void callback(mixed $data, int $result[, resource $req]);

		     o $data
		       -is custom data passed to the request.

		     o $result
		       -request-specific result value; basically, the value returned by corresponding system call.

		     o $req
		       -is optional request resource which can be used with functions like eio_get_last_error(3)

	      o $data
		- Arbitrary variable passed to $callback.

RETURN VALUES

       eio_seek(3) returns request resource on success or FALSE on error.

PHP Documentation Group 													       EIO_SEEK(3)