Bug #10384 Updated: read() buffer memory not freed
| From: | rod at 23net dot net | Date: | Thu, 17 May 2001 14:38:54 +0000 |
| Subject: | Bug #10384 Updated: read() buffer memory not freed | ||
| Groups: | php.dev | ||
| Request: | Send a blank email to php-dev+get-55624@lists.php.net to get a copy of this message | ||
ID: 10384
User Update by: rod@23net.net
Old-Status: Open
Status: Closed
Bug Type: Sockets related
Operating system: FreeBSD 4.2
PHP Version: 4.0.4pl1
Description: read() buffer memory not freed
This problem appears to be FreeBSD specific. Still exists with FreeBSD 4.3 but is non-existent on
Slackware.
Interesting side note: I had modified the code below and introduced a bug which caused Slackware to
send a 0 length message. That is this line:
write($msgsock,$send,strlen($send));
was changed to:
write($msgsock,$msgToSend,strlen($send));
and should have been:
write($msgsock,$msgToSend,strlen($msgToSend));
The variable $send was no longer defined resulting in the correct behavior under Slackware of
sending no message, however under FreeBSD the full message was sent.
Since this appears to be a bug in the libraries under FreeBSD and NOT PHP related I'm closing
the ticket.
Previous Comments:
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[2001-05-03 13:33:45] rod@23net.net
Problem still exists in 4.0.5
The script originally uses ~2MB resident. After connections are accepted it begins using memory in
chunks specified in the read() function until it reaches ~6-6.5MB (varies with each run), at which
time it continues to run without allocating more memory.
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[2001-04-18 15:27:25] rod@23net.net
Using the following code:
<?
/* Allow the script to hang around waiting for connections. */
set_time_limit (0);
##### Connect to DB
mysql_connect('localhost','chatscript','jen481');
##### Open log file
$fp=fopen('chat_log','a');
$outMsgHeader="HTTP/1.1 200 OKrnDate: ";
$outMsgAfterDate=" GMTrnServer: PHPrnConnection: closernTransfer-Encoding:
chunkedrnContent-Type: text/htmlrnrn";
$outMsgFooter="rnrn";
$sock=open_listen_sock(1089);
if ($sock<0)
{
echo "socket() failed: reason: " . strerror ($sock) . "n";
exit;
}
if (($ret = listen ($sock, 5)) < 0)
{
echo "listen() failed: reason: " . strerror ($ret) . "n";
shutdown($sock,2);
exit;
}
do
{
if (($msgsock = accept_connect($sock)) < 0)
{
echo "accept_connect() failed: reason: " . strerror ($msgsock) . "n";
shutdown($sock,2);
exit;
}
$ret=read($msgsock,$buf,2048);
$isPost=strpos($buf,'POST');
if ($isPost===false)
{
$isGet=strpos($buf,'GET');
if ($isGET===false)
{
write($msgsock,' HTTP/1.1 405rn',13);
}
else
{
$startQS=strpos($buf,'?')+1;
$endQS=strpos($buf,' ',$startQS);
$lenQS=$endQS-$startQS;
$QS=substr($buf,$startQS,$lenQS);
}
}
else
{
do
{
$ret=read($msgsock,$buf,2048);
if (substr($buf,0,15)=="Content-length:")
{
$conLen=substr($buf,16);
}
} while ($buf != "n");
// through with headers, now get actual content
$ret=read($msgsock,$buf,$conLen);
// $buf now contains the query string
$QS=$buf;
}
$msgToSend=urlencode(procMsg($QS));
$msgLen=dechex(strlen($msgToSend));
$sendDate=gmdate('D, d M Y H:i:s');
$send=$outMsgHeader.$sendDate.$msgLen."rn".$msgToSend.$outMsgFooter;
write($msgsock,$send,strlen($send));
$log=$sendDate."t".$QS."t".$msgToSend."n";
fwrite($fp,$log);
close ($msgsock);
} while (true);
?>
(The function procMsg() is not relevent as for bug testing is set to return 'test')
Running this script causes memory to be consumed and not released with each connection. I've
narrowed the problem down to the read() function as I can affect the rate of memory consumption by
modifying the length argument. Evidently the buffer is not freed.
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Full Bug description available at: http://bugs.php.net/?id=10384