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.