Description:
------------
The system will run fine for some time, then will suddenly start to throw these errors:

[13-Apr-2004 12:07:42] PHP Warning:  ifx_connect(): E [SQLSTATE=IX 000  SQLCODE=
-439] in /data/site-ACA/librairies/lib_db.php3 on line 41
[13-Apr-2004 12:07:54] PHP Warning:  ifx_connect(): E [SQLSTATE=IX 000  SQLCODE=
-439] in /data/site-ACA/librairies/lib_db.php3 on line 41
...

A restart of apache will always solve the problem

I'm running php with this configure:
'./configure' '--with-informix=yes' '--with-apache=../apache_1.3.29' '--enable-track-vars' '--enable-sockets' '--enable-wddx' '--with-xmlrpc' '--enable-xslt' '--with-xslt-sablot=/usr/local/' '--with-expat-dir=/usr/local' '--with-iconv-dir=/usr/local/'

on apache 1.3.29.

Informix SDK: 2.81UC3
Informix Dynamic Server: 9.30.UC1

This is the description of that error from informix:

-439    Database server is currently processing an SQL task.
 
You attempted to call an SQL routine or attempted to execute an SQL
statement within a signal handling function/routine or a callback
function/procedure. Use only the sqldone() and sqlbreak() library
functions inside your IBM Informix ESQL/C callback function. Use only
the ECO-SQD and ECO-SQB library routines inside your ESQL/COBOL callback
procedure. In addition, if you want to unregister your callback function
in IBM Informix ESQL/C, you can invoke the sqlbreakcallback() callback
registration function within your callback procedure. If you want to
unregister your callback procedure in ESQL/COBOL, you can invoke the
ECO-SQBCB callback registration routine within your callback
procedure.


Reproduce code:
---------------
I'm sorry i can't reproduce this without running my live system. 
The best I can come up with is:
$connection = ifx_connect($db,$user,$pass);

Expected result:
----------------
Successful connection

Actual result:
--------------
[13-Apr-2004 12:07:54] PHP Warning:  ifx_connect(): E [SQLSTATE=IX 000  SQLCODE=
-439] in /data/site-ACA/librairies/lib_db.php3 on line 41