I have MATLAB r2013b, IIS 7.5, php 5.6 on Windows Server 2008 and trying to do the following:
<?php
...
chdir($matlabScriptsDir);
exec("matlab -r test_func(args) -logfile $logfile", $output);
$output shows that process exited with code 0, in the TaskManager I see MATLAB.exe running from the user IUSR, $logfile is created and locked by this process, but the process does nothing – just hangs (there are no issues with running the same command from cmd.exe).
Where is the problem?
using the -r option is like entering commands to Matlab's command line, so after the command is executed you still have Matlab running, waiting for your next command. Try instead:
matlab -r "test_func(args), exit"
So that the Matlab process will end. I suggest you do even more, and wrap it with a try-catch (followed by exit) so that in case of an error the process will not hang.
Related
I have an Ubuntu VM running in VirtualBox that hosts a server using Apache. The concept of the server is to accept HTTP POST requests, store them in a MySQL database and then execute a Python script with the relevant POST data to be displayed in a Discord channel.
The process itself is working but each time the PHP script calls the Python script, a new process is created that never actually ends. After a few hours of receiving live data the server runs out of available memory due to the amount of lingering processes. The PHP script has the following exec call as the last line of code;
exec("python3 main.py $DATA");
I would like to come up with a way to actually kill the processes created from this exec command (using user www-data), either in the Python file after the script is executed or automatically with an Apache setting that I probably just do not know about.
When running the following command in a terminal I can see the different processes;
ps -o pid,user,%mem,command ax | sort -b -k3 -r
There are 3 separate processes that show up, 1 referencing the actual python3 exec command as marked up in PHP;
9903 www-data 0.4 python3 main.py DATADATADATADATADATADATA
Then another process showing the more common -k start commands;
9907 www-data 0.1 /usr/sbin/apache2 -k start
And lastly another process very similar to the PHP exec command;
9902 www-data 0.0 sh -c python3 main.py DATADATADATADATADATADATA
How can I ensure Apache cleans these processes up - OR what do I need to add into my Python or PHP code to appropriately exec a Python script without leaving behind processes?
Didn't realize the exec command in php would wait for a return output indefinitely. Added this to the end of the string I was using in my exec call; > /dev/null &
i.e.: exec("python3 main.py $DATA > /dev/null &");
I'm trying to use PHP to trigger a bash script that should never stop running. It's not just that the command needs to run and I don't need to wait for output, it needs to continue running after PHP is finished. This has worked other times (and the question has been asked already), the difference seems to be my bash script has a trap for when it's closed.
Here is my bash script:
#!/bin/bash
set -e
WAIT=5
FILE_LOCK="$1"
echo "Daemon started (PID $$)..."
echo "$$" > "$FILE_LOCK"
trap cleanup 0 1 2 3 6 15
cleanup()
{
echo "Caught signal..."
rm -rf "$FILE_LOCK"
exit 1
}
while true; do
# do things
sleep "$WAIT"
done
And here is my PHP:
$command = '/path/to/script.sh /tmp/script.lock >> /tmp/script.log 2>&1 &';
$lastLine = exec($command, $output, $returnVal);
I see the script run, the lock file get created, then it exits, and the trap removes the lock file. In my /tmp/script.log I see:
Daemon started (PID 55963)...
Caught signal...
What's odd is that this only happens when running the PHP via Apache. From command line it keeps running as expected.
The signal on the trap that's being caught is 0.
I've tried wrapping my command in a bash environment, like $command = '/bin/bash -c "' . addslashes($command) . '"';, also tried adding nohup to the beginning. Nothing seems to be working. Is this possible to do for a never ending script?
Found the problem thanks to #lxg.
My # do things command was giving errors, which was causing the script to exit. For some reason they were suppressed.
When removing set -e from the beginning of my bash script I started seeing the errors output to my log file. Not sure why they didn't show up before.
The issue was in my bash loop it was running PHP commands. Even though my bash user and Apache user are the same, for some reason they had different $PATHs. This meant that when running on command line I was using a PHP7 binary, but when Apache trigged bash commands it was using a PHP5 binary (even though Apache itself is configured to use PHP7). So the application errored out and that is what caused the script to die.
The solution was to explicitly set the PHP binary path in my bash loop.
I was doing this with
BIN_PHP=$(which php)
But on true command line it would return one value (/path/to/php7/bin/php) vs command line initiated by Apache (/path/to/php5/bin/php). Despite Apache being the same as a my command line user, it didn't load the ~/.bashrc which specified my correct PHP path.
I try to plan one-time job with 'at' command. There is next code in script:
$cmd = 'echo "/usr/bin/php '.$script_dir.$script_name.' '.$args.'"|/usr/bin/at "'.$time.'" 2>&1';
exec($cmd, $output , $exit_code);
When I run this command from script it adds the job to the schelude. This I see by the line in logs job 103 at Thu Sep 3 15:08:00 2015 (same text contains $output). But then nothing happens in specified time like at ignores the job. And there are no error messages in logs.
When I run same command with same args from command line on server it scheludes the job and than runs it at specified time.
I found out that when I try to plan a job via php script it runs under apache user. I tried to run next in command line on server:
sudo -u apache echo "/usr/bin/php /var/www/pant/data/www/pant.com/scripts/Run.php firstarg secondarg "|/usr/bin/at "16:00 03.09.2015"
It works correct too. I checked sudoers and have added apache user with NOPASSWD privileges. Script Run.php has execute rights.
at.deny is empty. at.allow does not exist.
So question is: why 'at' does not run command given via php script (exec) but runs same command in command line? How to run it?
Thanks to all.
I found by chance answer at stackexchange.com:
The "problem" is typically PHP is intended to run as module in a webserver. You may need to install the commandline version of php before you can run php scripts from the commandline
I have a pdf file that makes the pdf2swf tool to run forever. when running the following command manually :
pdf2swf -Q 10 test.pdf
The script aborts after 10 seconds becouse of the -Q 10 flag, but when running the same command using php the script runs forever. I've tried using shell_exec() ,exec() and passthru() and all of them ignored the -Q flag.
Has anyone encontered anything like this with pdf2swf tool or with any other PHP exec ?
EDIT
when I run it manually
php -r "exec('pdf2swf -Q 10 test.pdf');"
It aborts after 10 seconds, but when running as a deamon, again, it won't abort
I tried same command in my test project and it worked fine with no issues, please find my code as -
$out = exec("pdf2swf font_example.pdf -o varun.swf", $rest);
I'm attempting to query an Exchange server using a powershell script executed by PHP and it doesn't seem to be working. The command I'm attempting to run is:
powershell "Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010";"Get-CASMailbox -Identity user#example.com | fl ActiveSyncEnabled"
If I type that directly into the command prompt, it executes correctly and returns:
ActiveSyncEnabled : True
When I try it in PHP:
$output=shell_exec('powershell "Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010";"Get-CASMailbox -Identity user#example.org | fl ActiveSyncEnabled"');
I get nothing. $output is set but blank. If I add "> output.txt" to the end, I get a blank text file. I'm able to run other, simpler powershell commands successfully via PHP, but not this one. The Apache service is running as the same user as when I successfully executed the script via the command prompt.
Any ideas?
I'm running:
Windows Server 2008 R2 SP1 64-bit
Apache 2.2.22 32-bit
PHP 5.2.17 VC6 32-bit
Exchange Management Console 2010
You may try adding 2>&1 at the end of the command, e.g.:
$output=shell_exec('powershell "Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010";"Get-CASMailbox -Identity user#example.org | fl ActiveSyncEnabled" 2>&1');
Sometimes, a line break at the beginning of the powershell output seems to prevent shell_exec printing anything else.