php man page for eio_sync_file_range

EIO_SYNC_FILE_RANGE(3)							 1						    EIO_SYNC_FILE_RANGE(3)

eio_sync_file_range - Sync a file segment with disk

SYNOPSIS
       resource  eio_sync_file_range  (mixed   $fd, int  $offset, int  $nbytes, int  $flags, [int  $pri = EIO_PRI_DEFAULT], [callable  $callback =
       NULL], [mixed  $data = NULL])

DESCRIPTION
       eio_sync_file_range(3) permits fine control when synchronizing the open file referred to by the file descriptor $fd with disk.

PARAMETERS
	      o $fd
		- File descriptor

	      o $offset
		- The starting byte of the file range to be synchronized

	      o $nbytes
		- Specifies the length of the range to be synchronized, in bytes. If $nbytes is zero, then all bytes from $offset through  to  the
		end of file are synchronized.

	      o $flags
		-   A	bit-mask.   Can   include   any  of  the  following  values:  EIO_SYNC_FILE_RANGE_WAIT_BEFORE,	EIO_SYNC_FILE_RANGE_WRITE,
		EIO_SYNC_FILE_RANGE_WAIT_AFTER. These flags have the same meaning as their SYNC_FILE_RANGE_*  counterparts(see	SYNC_FILE_RANGE(2)
		man page).

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

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