From: tiny_grasshopper at hotmail dot com
Operating system: Win32 XP SP2
PHP version: 5.2.3
PHP Bug Type: Sockets related
Bug description: client disconnect not detected by socket_select()
Description:
------------
I was working on aan abstraction layer for a multi threaded server. It was
not till very late I noticed the following strange behaviour:
I let a bunch of client connect. Lets say #1, #2 and #3.
When I disconnect them (not gracefuly) in de backward order (#3, #2 then
#1) every thing works as it should be; the 'Close' callback functions are
called, and in the right order.
However, when I disconnect them in the same order (#1, #2 then #3) the
callback functions will not be called until the last client is closed.
After further testing I noticed that all client closed will only be
detected by socket_select if the latter clients are closed.
Reproduce code:
---------------
function Error($error, $desc)
{ echo "Error: $error - $desc\n"; }
function Connect($id)
{ echo "#$id connected.\n"; }
function Close($id)
{ echo "#$id closed.\n"; }
function Receive($id, $msg)
{ echo "#$id said: $msg\n"; }
//------------------------------------------------------------------------------
if (($listener = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) == false)
{
Error("socket_create() failed", socket_strerror($listener));
exit;
}
socket_set_option($listener, SOL_SOCKET, SO_REUSEADDR, 1);
socket_set_nonblock($listener);
if (($error = socket_bind($listener, '0.0.0.0', 23)) == false)
{
Error("socket_bind() failed", socket_strerror($error));
exit;
}
if (($error = socket_listen($listener, 5)) == false)
{
Error("socket_listen() failed", socket_strerror($error));
exit;
}
$sock = array($listener);
//------------------------------------------------------------------------------
for (;;)
{
$read = $sock;
socket_select($read, $write = NULL, $except = NULL, NULL);
foreach($read as $socket)
{
if ($socket == $listener)
{
if (($client = socket_accept($listener)) == false)
{
Error("socket_accept() failed",
socket_strerror($client));
continue;
} else {
$sock[] = $client;
$index = intval($client);
Connect($index);
}
} else {
$bytes = @socket_recv($socket, $input, 512, 0);
$index = intval($socket);
if ($bytes == 0)
{
if (($key = array_search($socket, $sock)) !==
false)
unset($sock[$key]);
socket_close($socket);
Close($index);
} else {
Receive($index, $input);
}
}
}
}
Expected result:
----------------
#5 connected.
#6 connected.
#7 connected.
#5 closed.
#6 closed.
#7 closed.
Actual result:
--------------
#5 connected.
#6 connected.
#7 connected.
#7 closed.
#5 closed.
#6 closed.
--
Edit bug report at http://bugs.php.net/?id=42423&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=42423&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=42423&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=42423&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=42423&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=42423&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=42423&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=42423&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=42423&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=42423&r=support
Expected behavior: http://bugs.php.net/fix.php?id=42423&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=42423&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=42423&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=42423&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=42423&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=42423&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=42423&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=42423&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=42423&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=42423&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=42423&r=mysqlcfg
