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1. drupal
   1. drupal6

Code

modules/upload/upload.module, line 431

<?php
function upload_delete($node) {
  $files = array();
  $result = db_query('SELECT DISTINCT f.* FROM {upload} u INNER JOIN {files} f ON u.fid = f.fid WHERE u.nid = %d', $node->nid);
  while ($file = db_fetch_object($result)) {
    $files[$file->fid] = $file;
  }

  foreach ($files as $fid => $file) {
    // Delete all files associated with the node
    db_query('DELETE FROM {files} WHERE fid = %d', $fid);
    file_delete($file->filepath);
  }

  // Delete all file revision information associated with the node
  db_query('DELETE FROM {upload} WHERE nid = %d', $node->nid);
}
?>