Description:
------------
pcntl_waitpid with option WNOHANG | WUNTRACED behaves just like WNOHANG alone, that means it never returns PID of children that have exited before. 
This could be a bug in Linux too. 
Please excuse me if I just don't understand the way  pcntl_waitpid should work.
Here's my php config:
./configure --with-apxs --with-config-file-path=/usr/local/lib --with-zlib --enable-ftp --enable-calendar --enable-track-vars --with-pgsql --with-unixodbc --with-mysql --enable-sigchild --enable-pcntl --with-gd --enable-cli --with-snmp --enable-ucd-snmp-hack  --with-openssl --enable-sockets --prefix=/usr/local/stow/php-4.3.4 --with-curl


Reproduce code:
---------------
function CheckExited () {
	while (($c=pcntl_waitpid(-1, $stat, WUNTRACED | WNOHANG))>0) {
		ExitTest($c,$stat);
	}
}

function ExitTest($c,$stat) { blabla..;}
while ($condition) {
 .
 .
 .
 $CHILD_PID = pcntl_fork();
 .
.
.
 CheckExited();
}



Expected result:
----------------
pcntl_waitpid(...WNOHANG|WUNTRACED) should return PIDs of all children that have exited  since the last call of CheckExited(). 


Actual result:
--------------
pcntl_waitpid(...WNOHANG|WUNTRACED) doesn't return any PIDs