Edit report at https://bugs.php.net/bug.php?id=51160&edit=1
ID: 51160
Comment by: burek021 at gmail dot com
Reported by: poehler at interworx dot com
Summary: Exec family of functions runs a script piped into
'head' too until script end
Status: Bogus
Type: Bug
Package: *General Issues
Operating System: CentOS 5.4
PHP Version: 5.2.13
Block user comment: N
Private report: N
New Comment:
I also have this issue. I've tried to test a simple example on several of our
web hosting machines and all of them have this issue present.
Simple test. Create a php file (test.php) with this content:
==================
<?php
shell_exec('ls | ls | ls | ls' );
==================
and then run: php -f test.php 2>&1
you should get the error like: ls: write error: Broken pipe
almost every time you run that command.
I'm not sure what's the reason for this, but I'm pretty sure it's the bug,
since the bash/sh doesn't ever raise that error no matter how many ls'es we put
into the pipe.
Previous Comments:
------------------------------------------------------------------------
[2010-12-07 21:57:02] sirjava at gmail dot com
I'm confused. If the exec family of functions is designed to execute something
as if executed from a shell, and the command executes properly from a shell,
but not in php... how is this not a php bug?
------------------------------------------------------------------------
[2010-05-17 11:21:33] m...@php.net
Sorry, but your problem does not imply a bug in PHP itself. For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions. Due to the volume
of reports we can not explain in detail here why your report is not
a bug. The support channels will be able to provide an explanation
for you.
Thank you for your interest in PHP.
$ cat 51160.php
<?
pcntl_signal(SIGPIPE, function() { exit; });
passthru ("/bin/sh 51160.sh | head -n1");
------------------------------------------------------------------------
[2010-02-26 21:22:04] binarycleric at gmail dot com
Just wanted to confirm that this also occurs on Mac OS 10.6 using version PHP
5.3.0.
------------------------------------------------------------------------
[2010-02-26 21:15:40] poehler at interworx dot com
Description:
------------
See reproduce code and expected / actual result sections for details.
Short story is when exec'ing with a pipe to 'head', we're getting unexpected
results.
I'm aware this may be 'correct' behavior, by some definition, but for the life
of me I can't figure out where this behavior is documented, if that is the
case. So if that is the case, please point me in the right direction, if you
could be so kind.
Reproduce code:
---------------
test.sh:
=================
#!/bin/sh
for i in 1 2 3 4 5
do
echo "Welcome $i times"
sleep 1
done
==================
test.php:
==================
<?
passthru( '/bin/sh test.sh | head -n1' );
==================
Expected result:
----------------
Here is the output of running the same command at the shell, which is correct.
==================
[root@me]# time /bin/sh test.sh | head -n1
Welcome 1 times
real 0m1.030s
user 0m0.002s
sys 0m0.027s
==================
And I would expect identical (save minor timing differences) when test.php is
run.
Actual result:
--------------
[root@me]# php test.php
Welcome 1 times
test.sh: line 5: echo: write error: Broken pipe
test.sh: line 5: echo: write error: Broken pipe
test.sh: line 5: echo: write error: Broken pipe
test.sh: line 5: echo: write error: Broken pipe
real 0m5.191s
user 0m0.002s
sys 0m0.038s
Note that this took 5 seconds instead of 1.
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=51160&edit=1
