#48506 [Opn->Ver]: upcoming apr closes descriptors by default
ID: 48506
Updated by: scottmac@php.net
Reported By: arekm at maven dot pl
-Status: Open
+Status: Verified
Bug Type: Feature/Change Request
PHP Version: 5.2.9
-Assigned To:
+Assigned To: scottmac
New Comment:
The details are here
https://issues.apache.org/bugzilla/show_bug.cgi?id=46425
Previous Comments:
------------------------------------------------------------------------
[2009-06-09 13:47:52] arekm at maven dot pl
Description:
------------
Upcoming apr 2.0.0 (or 1.3 with backported patch) uses O_CLOEXEC for
own descriptors by default.
This means that when using shell_exec() the run script/binary has no
stdin/stdout/stderr due to O_CLOEXEC. This also means that if any output
is produced then script ends with EPIPE.
Tested with apache + apr 1.3 with backported patch.
http://svn.apache.org/viewvc/apr/apr/trunk/CHANGES?r1=747357&r2=748988
Reproduce code:
---------------
<?php
echo shell_exec("LC_ALL=C strace -o /tmp/WYNIK -f -F -s 200 ls -l
/notexistingfile");
?>
Run from apache + php + apr 1.3 + backported O_CLOEXEC patch like this
one
http://cvs.pld-linux.org/cgi-bin/cvsweb/packages/apr/apr-bug-46425.patch?rev=1.8
Expected result:
----------------
run "ls -l" and produce some output about file not existing
Actual result:
--------------
30120 lstat("/notexistingfile", 0x18f55f0) = -1 ENOENT (No such file or
directory)
30120 write(2, "ls: ", 4) = -1 EBADF (Bad file
descriptor)
30120 write(2, "cannot access /notexistingfile", 30) = -1 EBADF (Bad
file descriptor)
30120 write(2, ": No such file or directory", 27) = -1 EBADF (Bad file
descriptor)
30120 write(2, "\n", 1) = -1 EBADF (Bad file
descriptor)
30120 close(1) = 0
30120 close(2) = -1 EBADF (Bad file
descriptor)
30120 exit_group(2)
As you can see there is no file descriptor 2 and this means that ls
output is lost.
Probably the best for php is to always provide own descriptors without
relying on apache provided one.
------------------------------------------------------------------------
--
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