how to handle infinite loop process when using proc_open

Question

I use proc_open to execute a program created by c language.

I was using file for the "stdout".

$descriptorspec = array(
   0 => array("pipe", "r"),
   1 => array("file", "/tmp/example.output"),
   2 => array("file", "/tmp/example.error", "a")
);

Everything is fine when I was executing good program but problem occurred when I was executing infinite loop program like the code below :

#include "stdio.h"

int main(){
    while(1){
        printf("Example");
    }
    return 0
}

File example.output will make my hard disk full. So I need to delete the file and restart my computer. My question is how to handle something like this?

Thanks :)

How about having a time restriction? (if you really don't want to remove your `` — hjpotter92, Mar 19 '12 at 08:55
What did you expect would happen when running an infinite loop like that? — Jeremy Harris, Mar 19 '12 at 08:56
hjpotter92: i set time restriction too, so when the time limit exceeded, system will kill the proc_open process cillosis: i hope i can kill the proc_open process and save my hardisk space :D Shiplu: actually the infinite loop program is a input from user. so i need to handle this thing — Sunu Pinasthika Fajar, Mar 19 '12 at 09:05

score 0 · Answer 1 · answered Mar 19 '12 at 08:57

0

The only thing you can do is slaughter the offending process without prejudice using proc_terminate (but you can be polite and allow it to run for a while first, in effect imposing a time limit for it to complete).

For example:

$proc = proc_open(...);
sleep(20); // give the process some time to run
$status = proc_get_status($proc); // see what it's doing
if($status['running']) {
    proc_terminate($proc); // kill it forcefully
}

Don't forget to clean up any handles you still have in your hands afterwards.

answered Mar 19 '12 at 08:57

Jon

428,835
81
738
806

i try something like that before, something like "jerhee" say at http://id.php.net/manual/en/function.proc-terminate.php#81353. moreover i delete the example.output file after do that using system(). but my harddisk still become full. any idea? – Sunu Pinasthika Fajar Mar 19 '12 at 09:02
@SunuPinasthikaFajar: No, you need to do your own debugging, sorry. – Jon Mar 19 '12 at 09:40
Ok thanks, but i will try your advice :). Maybe i will found something. – Sunu Pinasthika Fajar Mar 19 '12 at 11:40

how to handle infinite loop process when using proc_open

1 Answers1