(PECL eio >= 0.5.0b)
eio_seek — Repositions the offset of the open file associated with the fd
argument to the argument offset
according to the directive whence
$fd
, int $offset
, int $whence
[, int $pri
= EIO_PRI_DEFAULT
[, callable $callback
= NULL
[, mixed $data
= NULL
]]] )
eio_seek() repositions the offset of the open file associated with
stream, Socket resource, or file descriptor specified by fd
to the argument offset
according to the directive whence
as follows:
EIO_SEEK_SET
- Set position equal to offset
bytes.EIO_SEEK_CUR
- Set position to current location plus offset
.EIO_SEEK_END
- Set position to end-of-file plus offset
.fd
Stream, Socket resource, or numeric file descriptor
offset
Starting point from which data is to be read.
length
Number of bytes to be read.
pri
请求的优先级: EIO_PRI_DEFAULT
, EIO_PRI_MIN
, EIO_PRI_MAX
, or NULL
.
如果是 NULL
, pri
将设为
EIO_PRI_DEFAULT
.
callback
callback
函数将在请求结束时被调用.
必须符合此原型:
void callback($data, $result);
$data
是传给该请求的特定数据.
$result
包含特定请求的结果值, 通常是相应的系统调用的返回值.
data
Arbitrary variable passed to callback
.
eio_seek() returns request resource on success or FALSE
on error.