eio_sendfile
(PECL eio >= 0.0.1dev)
eio_sendfile — Transfer data between file descriptors
说明
eio_sendfile (
mixed
$out_fd
,
mixed $in_fd
,
int $offset
,
int $length
[,
int $pri
[,
callable $callback
[,
string $data
]]] ) :
resource
eio_sendfile() copies data between one file descriptor and another. See SENDFILE(2) man page for details.
参数
-
out_fd
-
Output stream, Socket resource, or file descriptor. Should be opened for writing.
-
in_fd
-
Input stream, Socket resource, or file descriptor. Should be opened for reading.
-
offset
-
Offset within the source file.
-
length
-
Number of bytes to copy.
-
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_sendfile() returns request resource on success or FALSE
on error.