eio_open

(PECL eio >= 0.0.1dev)

eio_open — Opens a file

Beschreibung

eio_open(
    string $path,
    int $flags,
    int $mode,
    int $pri,
    callable $callback,
    mixed $data = NULL
): resource

eio_open() opens file specified by path in access mode mode with

Parameter-Liste

path

Path of the file to be opened.

Warnung

In some SAPIs(e.g. PHP-FPM) it could fail, if you don't specify full path.

flags

One of EIO_O_* constants, or their combinations. EIO_O_* constants have the same meaning, as their corresponding O_* counterparts defined in fnctl.h C header file. Default is EIO_O_RDWR.

mode

One of EIO_S_I* constants, or their combination (via bitwise OR operator). The constants have the same meaning as their S_I* counterparts defined in » sys/stat.h C header file. Required, if a file is created. Otherwise ignored.

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

Die callback-Funktion wird aufgerufen, wenn die Anfrage abgeschlossen ist. Sie muss dem folgenden Prototyp entsprechen:

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

data: sind die benutzerdefinierten Daten, die an die Anfrage übergeben werden.
result: der anfragespezifische Ergebniswert; im Grunde der Wert, der vom entsprechenden Systemaufruf zurückgegeben wird.
req: ist eine optionale Anfrage-Ressource, die in Funktionen wie eio_get_last_error() verwendet werden kann

data

Arbitrary variable passed to callback.

Rückgabewerte

eio_open() returns file descriptor in result argument of callback on success; otherwise, result is equal to -1.

Beispiele

Beispiel #1 eio_open() example

<?php
$temp_filename = "eio-temp-file.tmp";

/* Is called when eio_close() finishes */
function my_close_cb($data, $result) {
 // Zero indicates success
    var_dump($result == 0);
 @unlink($data);
}

/* Is called when eio_open() finishes */
function my_file_opened_callback($data, $result) {
 // $result should contain the file descriptor
    var_dump($result > 0);

    if ($result > 0) {
  // Close the file
        eio_close($result, EIO_PRI_DEFAULT, "my_close_cb", $data);
        eio_event_loop();
    }
}

// Create new file for reading and writing
// Deny group and others to do anything with that file
eio_open($temp_filename, EIO_O_CREAT | EIO_O_RDWR, EIO_S_IRUSR | EIO_S_IWUSR,
  EIO_PRI_DEFAULT, "my_file_opened_callback", $temp_filename);
eio_event_loop();
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

bool(true)
bool(true)

Siehe auch

eio_mknod() - Create a special or ordinary file

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