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Extract file_open_lock and file_write_unlock

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This commit is contained in:
Jakub Vrana
2018-01-24 12:04:53 +01:00
parent f0d2af329a
commit 03e3f517a8
2 changed files with 33 additions and 15 deletions
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28
adminer/include/functions.inc.php
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@@ -1131,6 +1131,34 @@ function get_temp_dir() {
return $return;
}
/** Open and exclusively lock a file
* @param string
* @return resource or null for error
*/
function file_open_lock($filename) {
$fp = @fopen($filename, "r+"); // @ - may not exist
if (!$fp) { // c+ is available since PHP 5.2.6
$fp = @fopen($filename, "w"); // @ - may not be writable
if (!$fp) {
return;
}
}
flock($fp, LOCK_EX);
return $fp;
}
/** Write and unlock a file
* @param resource
* @param string
*/
function file_write_unlock($fp, $data) {
rewind($fp);
fwrite($fp, $data);
ftruncate($fp, strlen($data));
flock($fp, LOCK_UN);
fclose($fp);
}
/** Read password from file adminer.key in temporary directory or create one
* @param bool
* @return string or false if the file can not be created