Bug #51160 [Opn->Bgs]: Exec family of functions runs a script piped into 'head' too until script end
Edit report at http://bugs.php.net/bug.php?id=51160&edit=1
ID: 51160
Updated by: mike@php.net
Reported by: poehler at interworx dot com
Summary: Exec family of functions runs a script piped into
'head' too until script end
-Status: Open
+Status: Bogus
Type: Bug
Package: *General Issues
Operating System: CentOS 5.4
PHP Version: 5.2.13
New Comment:
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");
Previous Comments:
------------------------------------------------------------------------
[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 http://bugs.php.net/bug.php?id=51160&edit=1
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