eio_fallocate

(PECL eio >= 0.0.1dev)

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

Description

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.

Note: File should be opened for writing
EIO_O_CREAT should be logically OR'd with EIO_O_WRONLY, or EIO_O_RDWR

Parameters

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

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.

Return Values

eio_fallocate() returns request resource on success, or false on failure.