CODEWITHSUNDEEP
phpfatal-errorshell-exec
Siddharth Kumar
Siddharth Kumar

Reputation: 1715

limit execution time of shell_exec

I have an exe file which has the following code:

while(1)

printf("hello\n");

I'm executing this exe through php using shell_exec

$output = shell_exec('C:/Users/thekosmix/Desktop/hello.exe 2>&1');

echo $output;

now the script is executing for very long time untill i kill the process from task manager and it gives fatal error:

(Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 133693440 bytes) in C:\xampp\htdocs\shell\index.php on line 7)

I want the script (or this function) to run for a given time duration and print whatever output is generated during the time-duration not any fatal error. set_time_limit() is also not solving the problem.

Upvotes: 5

Views: 6361

Answers (3)

Bastian Haustein
Bastian Haustein

Reputation: 66

To sum it up: do the following, if you use a Linux server:

shell_exec('ulimit -t 120 && ' . $path_to_program);

This terminates after two minutes of cpu-usage, which is a lot more than 2 minutes real time depending on the resources hunger of your program.

Upvotes: 2

Cal
Cal

Reputation: 7157

You can't do this from within PHP - set_time_limit() is only checked after each PHP statement gets executed. Under linux you'd use ulimit, but it looks like you're using Windows.

You'll need to either modify the hello.exe executable to build in a timeout, or write a wrapper that you call from PHP, which call hello.exe and handles the timeout. In any language that can easily fork, this is trivial.

Upvotes: 3

goat
goat

Reputation: 31813

You could alter the script as so

while (shouldKeepRunning())

shouldKeepRunning could, in its most crude form, check for whether a certain file exists to determine if it should keep running. Then you just create or delete a file to shut the script down gracefully. On linux, you could use a signal handler for this, but not windows. Anyway, you get the point.

you could use ticks if the outer while loop isnt granular enough without massive code modifcation. http://php.net/manual/en/control-structures.declare.php

Upvotes: 0

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