Shell Script Segmentation Fault

Question

Hi I have a shell script which should run based on the return of php code:

x=1
while [[ "$x" != 5 ]] 
do
  echo "Welcome $x"
  php test.php
  x=$?
done

And the php code

echo "Testdfdf test".PHP_EOL;
exit(4);

So I want whenever I get 5 from php to quit the loop.

But I get sometimes:

./myshell: line 7: 20529 Segmentation fault      php test.php

Should it loop without problem?

Enable core dumps with ulimit; run the script; when you look at the core file, it will tell you which process resulted in its creation -- most likely the PHP interpreter, making this not a bash problem; you can then generate a stack trace from the core dump to report to the relevant party. — Charles Duffy
– Charles Duffy, Commented Jul 24, 2009 at 12:12

Fuzzy76 · Accepted Answer · 2009-09-07 11:28:37Z

2

Probably because of this error which affects both Ubuntu and Debian... https://bugs.launchpad.net/ubuntu/+source/php5/+bug/343870

answered Sep 7, 2009 at 11:28

Fuzzy76

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1 Comment

Tech4Wilco Over a year ago

I have the same issue with Debian but not in CentOS

slipbull · Accepted Answer · 2009-07-24 11:24:43Z

1

It should and it does, but no clue about why php is ending with a segfault.

answered Jul 24, 2009 at 11:24

slipbull

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Comments

ghostdog74 · Accepted Answer · 2009-07-24 13:06:55Z

1

your shell while loop will loop forever, as your php script returns 4 to shell, and your while loop checks for !=5. which means the condition is not going to be met. what actually is it you are wanting to do? unless necessary, i would advise to do everything with php (or shell) , but try not to intermingle both.

edited Jul 24, 2009 at 13:06

answered Jul 24, 2009 at 11:26

ghostdog74

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1 Comment

Charles Duffy Over a year ago

Intermingling both is fully in line with the UNIX ideology of "many small tools"; calling other programs and checking their exit code is, after all, what shell does best. :) The advantage of pushing everything into PHP is that there wouldn't be a need to start up a new interpreter every cycle of the loop -- certainly a performance enhancement, albeit perhaps one with an impact on correctness (if the PHP [ab]uses global variables).

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