From: jed at jed dot bz
Operating system: Windows XP SP2
PHP version: 5.0.2
PHP Bug Type: Sockets related
Bug description: socket_select() fails when managing large numbers of sockets
Description:
------------
Posted to php.general. Posted here on behalf of original bug discoverer,
as I wrote a large test case for it.
PHP 5.0.2 CLI
Windows XP SP 2 with DEP excepted for PHP-CLI
(DEP *was* a problem early, but I excepted it for php.exe)
socket_select() will fail when managing a large number of sockets. The
sockets extension itself can manage a bunch, but when socket_select() is
attempted with a 'read' array larger than exactly 64 sockets, it prints
out the following message and dies:
Warning: socket_select(): unable to select [0]: An operation was attempted
on something that is not a socket.
PHP's problem? My problem? A print_r of the array before feeding it to
socket_select shows this:
Array
(
[1] => Resource id #4
[2] => Resource id #5
[3] => Resource id #6
(...)
[64] => Resource id #67
[65] => Resource id #68
)
Valid resources, I'd assume. Zero-basing the array causes the same
problem. If there are more than exactly 64 sockets in the array fed to
socket_select for the read parameter socket_select() will fail.
Due to lack of time I'll only submit the test case for read, but write and
except might be prone to the same problem. Let's tackle one at a time.
Latest CVS was unusable as the sockets extension currently doesn't link
correctly (numerous PHP startup warnings were encountered when starting
php just for php -v)... The snaps I used to obtain this result were
5.0.x-dev 200411201730 ("5.0.3-dev")
5.1.x-dev 200411201930
Might have been misconfiguration on my end, because 5.0.x popped up a box
reporting a mismatch between extensions even after I changed extension_dir
to the snapshot package's extensions.
Reproduce code:
---------------
The Server
http://labs.jed.bz/HCJ/server.php.txt
The Load Client
http://labs.jed.bz/HCJ/load.php.txt
When executing, make sure $max_connections in the server is exactly equal
to $connections in the load tester (or, if you prefer, make it one under,
and telnet in to the server to make the last one).
Expected result:
----------------
...
connecting #65 of 65 ... ok
waiting for spew
Array
(
...
)
spew!
done!
Actual result:
--------------
[63] => Resource id #67
[64] => Resource id #68
)
Warning: socket_select(): unable to select [0]: An operation was attempted
on something that is not a socket.
in F:\Projects\HCJ\load.php on line 39
spew!
done!
----------------
This appeared in my debugger output while I was messing with getting a
backtrace (possible in VS?). Interest you?
First-chance exception at 0x7c81eb33 in php.exe: 0x000006A6: The binding
handle is invalid.
----------------
I can't recompile with debug symbols at this point, I'm unfortunately
pressed for time. Perhaps someone can run it through VS and see what comes
up.
--
Edit bug report at http://bugs.php.net/?id=30852&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=30852&r=trysnapshot4
Try a CVS snapshot (php5.0):
http://bugs.php.net/fix.php?id=30852&r=trysnapshot50
Try a CVS snapshot (php5.1):
http://bugs.php.net/fix.php?id=30852&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=30852&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=30852&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=30852&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=30852&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=30852&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=30852&r=support
Expected behavior: http://bugs.php.net/fix.php?id=30852&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=30852&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=30852&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=30852&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=30852&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=30852&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=30852&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=30852&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=30852&r=float
MySQL Configuration Error: http://bugs.php.net/fix.php?id=30852&r=mysqlcfg
