eio_fallocate

    (PECL eio >= 0.0.1dev)

    eio_fallocate — Allows the caller to directly manipulate the allocated disk space for a file

    说明

    eio_fallocate(
        mixed $fd,
        int $mode,
        int $offset,
        int $length,
        int $pri = EIO_PRI_DEFAULT,
        callable $callback = NULL,
        mixed $data = NULL
    ): resource

    eio_fallocate() allows the caller to directly manipulate the allocated disk space for the file specified by fd file descriptor for the byte range starting at offset and continuing for length bytes.

    注意: File should be opened for writing

    EIO_O_CREAT should be logically OR'd with EIO_O_WRONLY, or EIO_O_RDWR

    参数

    fd

    Stream, Socket resource, or numeric file descriptor, e.g. returned by eio_open().

    mode

    Currently only one flag is supported for mode: EIO_FALLOC_FL_KEEP_SIZE (the same as POSIX constant FALLOC_FL_KEEP_SIZE).

    offset

    Specifies start of the byte range.

    length

    Specifies length the byte range.

    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_fallocate() returns request resource on success, 或者在失败时返回 false.

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