public function truncate($offset = 0, $cb = null, $pri = EIO_PRI_DEFAULT)
{
if (!FS::$supported) {
$fp = fopen($this->path, 'r+');
$r = $fp && ftruncate($fp, $offset);
if ($cb) {
call_user_func($cb, $this, $r);
}
return;
}
eio_ftruncate($this->fd, $offset, $pri, $cb, $this);
}
/**
* Truncates this file
* @param integer $offset Offset. Default is 0
* @param callable $cb Callback
* @param integer $pri Priority
* @return resource|boolean
*/
public function truncate($offset = 0, $cb = null, $pri = EIO_PRI_DEFAULT)
{
$cb = CallbackWrapper::forceWrap($cb);
if (!$this->fd || $this->fd === -1) {
if ($cb) {
$cb($this, false);
}
return false;
}
if (!FileSystem::$supported) {
$fp = fopen($this->path, 'r+');
$r = $fp && ftruncate($fp, $offset);
if ($cb) {
$cb($this, $r);
}
return $r;
}
return eio_ftruncate($this->fd, $offset, $pri, $cb, $this);
}
private function onOpenHandle($openArr, $result, $req)
{
list($mode, $path, $promisor) = $openArr;
if ($result === -1) {
\call_user_func($this->incrementor, -1);
$promisor->fail(new FilesystemException(\eio_get_last_error($req)));
} elseif ($mode[0] === "a") {
\array_unshift($openArr, $result);
\eio_ftruncate($result, $offset = 0, $priority = null, [$this, "onOpenFtruncate"], $openArr);
} else {
\array_unshift($openArr, $result);
\eio_fstat($result, $priority = null, [$this, "onOpenFstat"], $openArr);
}
}
/**
* {@inheritdoc}
*/
public function truncate(int $size) : \Generator
{
if (!$this->isOpen()) {
throw new FileException('The file has been closed.');
}
if (0 >= $size) {
$size = 0;
}
$delayed = new Delayed();
\eio_ftruncate($this->handle, $size, null, function (Delayed $delayed, $result, $req) {
if (-1 === $result) {
$delayed->reject(new FileException(sprintf('Truncating the file failed: %s.', \eio_get_last_error($req))));
} else {
$delayed->resolve(true);
}
}, $delayed);
$this->poll->listen();
try {
$result = (yield $delayed);
$this->size = $size;
if ($this->position > $size) {
$this->position = $size;
}
} finally {
$this->poll->done();
}
return $result;
}
