[ecasound] php-triggered interactive script terminates

Hi,
apologies for incorrect nomenclature of procedures

 Problem: wanting to launch ecasound engine in interactive mode from php, with jack_transport controlling playback.

I have a php script that calls shell scripts which trigger playback of ecasound correctly. Ecasound is using jack, which I have invoked as www-data.
scripts such as

#!/bin/bash
# play
set -x on
TERM=linux
export TERM
ecasound -i /var/www/upload/*.wav -o jack,system
set -x off

work fine, both from terminal (as www-data) and exec from php generated web page:

else if
      ($_GET['action'] == "play") {
         $command = '/var/www/TRANSPORT/linuxplay.sh';
      //$output = passthru($command . ' 2>&1 &');
$output = exec($command . ' 2>&1', $output_array, $return_val);

so far so good, but the following script:

#!/bin/bash
# engine_start
set -x on
TERM=linux
export TERM
ecasound -c -i /var/www/upload/*.wav -o jack,system -G:jack,hereiam,recv -E engine-launch -K ;
set -x off

 only works invoked from terminal (as www-data). That is to say I see the connection "hereiam" in qjackctl's connection kit, and jack_transport (again, invoked by www-data) controls it just fine.
>>When invoked by php, the connection "hereiam" appears momentarily in qjackctl's connection kit and then disappears after a second.

Its php5, linux mint 12. My var/log/apache/error log gives:

+ set -x off
+ TERM=linux
+ export TERM
+ ecasound -c -i /var/www/upload/Fournobletruths-03.wav -o jack,system -G:jack,hereiam,recv -E engine-launch -K
Cannot lock down 82241434 byte memory area (Cannot allocate memory)
Cannot lock down 82241434 byte memory area (Cannot allocate memory)
+ set -x off

any help appreciated
                                               

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Received on Tue Sep 25 16:15:02 2012