Executing script from php.

pbeau · 09-01-2011, 12:48 PM

Hi ... I am trying to execute this:

PHP Code:



$musque='notempty'; 
while ($musque == 'notempty') 
{ 
// Play next file in que     
$query = "select * from musplay order by idx limit 1"; 
 
$result = @mysql_query($query);  
if (mysql_num_rows($result) == 0) 
    { 
        $musque='empty'; 
        exit(); 
    } 
        while ($row = mysql_fetch_array($result)) 
        {  
 
        $CMD = '/usr/bin/mpg123 -q /home/xfer/Music/'.$row['filen']; 
        echo $CMD; 
        exec($CMD);

In essence this script (it is cut short) should run as a process and is started via:

PHP Code:



include ('funclib.php'); 
$substr = "./mus_Player.php&"; 
$output = shell_exec($substr); 
echo $output; 
//$dum = mus_dispque();

the echo confirms the mpg123 command is received and formatted correctly - it just doesn't do anything!. If I cut and paste the result into a (non-root) tty, it executes as expected. Anyone can give me a hint as to why this won't execute in the LAMP environment? Note.. the rest of the script (not shown) executes fine - it is just the mpg command that echos but doers nothing other than a short delay.

Thanks for any hints

Paul

Tinkster · 09-01-2011, 01:51 PM

Educated guess: apache doesn't have access to the music files?

Cheers,
Tink

pbeau · 09-01-2011, 02:07 PM

Tink,
Thanks for the response. Your guess is undoutably better (or at least more educated) than mine. This is a private system - no public access - so if I chmod all the files to 777 is that the easiest way to test that theory? I'd rather not just wholesale change things without some understanding.

Much appreciated

Paul

pbeau · 09-03-2011, 02:41 AM

Update - changed a file to 777 and got the same result. I don't pretend to understand the security settings on files other than setting it too 777 is effective;ly 'all access'. As this is not a publicly exposed system, I'm not to concerned about inadvertently opening up holes. Thanks for the suggestion... any other ideas?

Tinkster · 09-03-2011, 02:58 PM

Have you looked at apache's logs (access/error) at all?

zunder1990 · 09-03-2011, 04:17 PM

If you are using Redhat based linux, you will need to deal with selinux. To fix selinux look here at step 5 http://wiki.centos.org/HowTos/SELinux.

pbeau · 09-04-2011, 07:20 AM

Thanks for the responses. Tink: I should have checked this before ... the request to start the player completes successfully (200) - as expected as other commands in the script work ok. zunder 1990: It is Umbutu ... it is the 64 Studio distribution (V 2.x) that I added the lampp package into. at the risk of revealing the true depth of my ignorance: For design reasons, the calling script attempts to start the player (in php) with

PHP Code:



$substr = "./mus_Player.php&"; 
$output = shell_exec($substr);

Within the called script teh player starts with

PHP Code:



$CMD = '/usr/bin/mpg123 -q /home/xfer/Music/'.$row['filen']; 
        echo $CMD; 
        exec($CMD);

In other OSes I am more familiar with, calling a script within a script like this increases 'depth' and there are limits to this....could I be hitting something similar in linix? now that the obvious is eliminated , I am going to have to explore the unlikely. Thanks for the help.