system() call hangs

In a PHP program(php1.php) i have a system() call like this:

system('/usr/local/bin/sh php2.php arg1');

The original PHP program (php1.php) when executed hangs. It stops responding. But if the system call is commented the program works fine.

The second PHP file (php2.php) when executed from the command line works fine. But when the same php2.php is called from the php1.php using the system() the code stops responding.

What might be the reason?

Thanks,
Navanee
rnavaneeAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Giovanni GCTOCommented:

What you are doing is basically wrong.
What is '/usr/local/bin/sh'? a bash compiled yourself?
Do this command work if typed in the command line?
 $ /usr/local/bin/sh php2.php arg1

Even if it works, what you typed above means:
/bin/sh -c '/usr/local/bin/sh php2.php arg1'
which makes no sense.

What you probably want is this:
system("/usr/local/bin/php -f php2.php arg1");

Let me know if my considerations are correct :-)
rnavaneeAuthor Commented:
Sorry I made a mistake ...

The call is ..
system('/usr/local/bin/php php2.php arg1');

This call makes causes the execution to hang.

I tried using 'php -f';  Even this fails...


Thanks,
Navanee


Giovanni GCTOCommented:
and what happens from the command line?
 $ php -f php2.php arg1

note that without the -f it's normal that it hangs, because it tries to read from standard input something that will never arrive
Exploring SharePoint 2016

Explore SharePoint 2016, the web-based, collaborative platform that integrates with Microsoft Office to provide intranets, secure document management, and collaboration so you can develop your online and offline capabilities.

aolXFTCommented:
system('/usr/local/bin/php php2.php arg1');

hmmm

Do you have shell access to the machine that this is running on? If so, then try executing the command on the command line.

Does it hang?

Try

system('/usr/local/bin/php php2.php arg1 &');

If this does work it will be a temperary fix. you'll need to fix the command so that it doesn't hang.

You might also make sure that /usr/local/bin/php is the correct path.

Why are you trying to do this? There's usually a better way to do things than using system(). You also lose the advantages of running the system as a module(if you are doing so).
rnavaneeAuthor Commented:
The call was

...
system ('/usr/local/bin/php $scriptName $arg');
...

The Single quote (') is the cause for all the problems...

I found it by myself.

Thanks
Giovanni GCTOCommented:
Sure it was, but another time please ask the question as it is in reality.
rnavaneeAuthor Commented:
Yes. I agree. It was my mistake. Sorry for that.
techtonikCommented:
moduloCommented:
PAQed with points refunded (50)

modulo
Community Support Moderator

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
PHP

From novice to tech pro — start learning today.