eio_seek

(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

Descrizione

resource eio_seek ( mixed $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.

Elenco dei parametri

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

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.

callback

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


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

data: is custom data passed to the request.
result: request-specific result value; basically, the value returned by corresponding system call.
req: is optional request resource which can be used with functions like eio_get_last_error()

data

Arbitrary variable passed to callback.

Valori restituiti

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