How to determine whether a file is still being transferred via ftp

Question

I have a directory with files that need processing in a batch with PHP. The files are copied on the server via FTP. Some of the files are very big and take a long time to co

Answer 1

Best way to check would be to try and get an exclusive lock on the file using flock. The sftp/ftp process will be using the fopen libraries.

// try and get exclusive lock on file
$fp = fopen($pathname, "r+");

if (flock($fp, LOCK_EX)) {  // acquire an exclusive lock
    flock($fp, LOCK_UN);    // release the lock
fclose($fp);
}
else {
    error_log("Failed to get exclusive lock on $pathname. File may be still uploading.");
}