eio_sync_file_range
(PECL eio >= 0.0.1dev)
eio_sync_file_range — Sync a file segment with disk
说明
$fd ,
int $offset ,
int $nbytes ,
int $flags [,
int $pri = EIO_PRI_DEFAULT [,
callable $callback = NULL [,
mixed $data = NULL ]]] ) :
resource
eio_sync_file_range() permits fine control when synchronizing the open file referred to by the file descriptor fd with disk.
参数
-
fd -
File descriptor
-
offset -
The starting byte of the file range to be synchronized
-
nbytes -
Specifies the length of the range to be synchronized, in bytes. If
nbytesis zero, then all bytes fromoffsetthrough to the end of file are synchronized. -
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). -
pri -
请求的优先级：
EIO_PRI_DEFAULT，EIO_PRI_MIN，EIO_PRI_MAX或NULL。如果是NULL，pri将设为EIO_PRI_DEFAULT。 -
callback -
callback函数在请求完成时被调用。其应匹配一下原型：void callback(mixed $data, int $result[, resource $req]);-
data -
传递给请求的用户数据。
-
result -
针对请求的结果的值。通常是相应的系统调用返回的值。
-
req -
可选的请求资源，可被 eio_get_last_error() 之类的函数使用。
-
-
data -
Arbitrary variable passed to
callback.
返回值
eio_sync_file_range() returns request resource on success or FALSE on error.
