public ReadOnlyStream::stream_lock($operation)
Support for flock().
An exclusive lock attempt will be rejected, as this is a read-only stream wrapper.
Parameters
int $operation: One of the following:
- LOCK_SH to acquire a shared lock (reader).
- LOCK_EX to acquire an exclusive lock (writer).
- LOCK_UN to release a lock (shared or exclusive).
- LOCK_NB if you don't want flock() to block while locking (not supported on Windows).
Return value
bool Return FALSE for an exclusive lock (writer), as this is a read-only stream wrapper. Return the result of flock() for other valid operations. Defaults to TRUE if an invalid operation is passed.
Overrides PhpStreamWrapperInterface::stream_lock
See also
http://php.net/manual/streamwrapper.stream-lock.php
File
- core/lib/Drupal/Core/StreamWrapper/ReadOnlyStream.php, line 113
Class
- ReadOnlyStream
- Defines a read-only Drupal stream wrapper base class.
Namespace
Drupal\Core\StreamWrapper
Code
public function stream_lock($operation) { if (in_array($operation, array(LOCK_EX, LOCK_EX | LOCK_NB))) { trigger_error('stream_lock() exclusive lock operations not supported for read-only stream wrappers', E_USER_WARNING); return FALSE; } if (in_array($operation, array(LOCK_SH, LOCK_UN, LOCK_SH | LOCK_NB))) { return flock($this->handle, $operation); } return TRUE; }
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