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Write PID into lock file

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Dylan K. Taylor 2019-06-13 15:11:59 +01:00
parent 4c5f6eb1b7
commit 862c844759
1 changed files with 10 additions and 2 deletions
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12
src/pocketmine/PocketMine.php
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@ -187,12 +187,20 @@ namespace pocketmine {
} }
define('pocketmine\LOCK_FILE_PATH', \pocketmine\DATA . 'server.lock'); define('pocketmine\LOCK_FILE_PATH', \pocketmine\DATA . 'server.lock');
define('pocketmine\LOCK_FILE', fopen(\pocketmine\LOCK_FILE_PATH, "cb")); define('pocketmine\LOCK_FILE', fopen(\pocketmine\LOCK_FILE_PATH, "a+b"));
if(!flock(\pocketmine\LOCK_FILE, LOCK_EX | LOCK_NB)){ if(!flock(\pocketmine\LOCK_FILE, LOCK_EX | LOCK_NB)){
critical_error("Another " . \pocketmine\NAME . " instance is already using this folder (" . realpath(\pocketmine\DATA) . ")."); //wait for a shared lock to avoid race conditions if two servers started at the same time - this makes sure the
//other server wrote its PID and released exclusive lock before we get our lock
flock(\pocketmine\LOCK_FILE, LOCK_SH);
$pid = stream_get_contents(\pocketmine\LOCK_FILE);
critical_error("Another " . \pocketmine\NAME . " instance (PID $pid) is already using this folder (" . realpath(\pocketmine\DATA) . ").");
critical_error("Please stop the other server first before running a new one."); critical_error("Please stop the other server first before running a new one.");
exit(1); exit(1);
} }
ftruncate(\pocketmine\LOCK_FILE, 0);
fwrite(\pocketmine\LOCK_FILE, (string) getmypid());
fflush(\pocketmine\LOCK_FILE);
flock(\pocketmine\LOCK_FILE, LOCK_SH); //prevent acquiring an exclusive lock from another process, but allow reading
//Logger has a dependency on timezone //Logger has a dependency on timezone
$tzError = Timezone::init(); $tzError = Timezone::init();