Edit report at https://bugs.php.net/bug.php?id=61873&edit=1
ID: 61873
Comment by: phpmpan at mpan dot pl
Reported by: dcb at insomniacsoft dot com
Summary: proc_get_status always returns exitcode -1
Status: Open
Type: Bug
Package: Program Execution
Operating System: Linux
PHP Version: 5.4.1
Block user comment: N
Private report: N
New Comment:
Have you tried testing this on non-Ubuntu box? Maybe it's something that depends on Ubuntu
configuration?
I still don't like the fact that a second process is spawned after the one PHP is starting.
The following code should also show calls to wait and values that are returned from
processes.
------------------------------------------
strace -f php -r '$descriptorspec = array(
0 => array("pipe", "r"),
1 => array("pipe", "w"),
2 => array("file", "/tmp/error-output.txt", "a")
);
$p = proc_open("/tmp/te", $descriptorspec, $pipes, "/tmp");
sleep(1);
fclose($pipes[0]);fclose($pipes[1]);
$s = proc_get_status($p);
print_r($s);' 2>&1 | grep '/tmp/te\|wait'
------------------------------------------
Previous Comments:
------------------------------------------------------------------------
[2012-05-01 01:12:19] dcb at insomniacsoft dot com
Well, that is returning the proper exit code.
It's strange that nobody else can reproduce this while I have it happening on 2
different Ubuntu machines. One is a 10.04 and the other one is 11.10.
I was thinking that it might be something else, but keep in mind that on the same
machine php 5.3 does work properly and returns the correct exit code in all the
tests.
------------------------------------------------------------------------
[2012-05-01 00:28:56] phpmpan at mpan dot pl
"and you the code is executing it. In other"
should be:
"and the code is executing it. In the other"
Sorry
------------------------------------------------------------------------
[2012-05-01 00:27:25] phpmpan at mpan dot pl
Since no one was able to reproduce this to this point, all that can be done is debugging it somehow
on your side and eliminate possible reasons.
What strace output tells us here is that "/tmp/te" actually exists and you the code is
executing it. In other case the second call to execve would not return 0. If it is
returning 0, it means that the interpretation of "/tmp/te" has actually started.
He's my output for comparison (snaps for 5.4 and trunk):
-------------------------------
[pid 7359] execve("/bin/sh", ["sh", "-c", "/tmp/te"], [/*
47 vars */] <unfinished ...>
[pid 7359] execve("/tmp/te", ["/tmp/te"], [/* 46 vars */]) = 0
[pid 7359] open("/tmp/te", O_RDONLY) = 3
write(1, "/tmp/te", 7/tmp/te) = 7
-------------------------------
What is puzzling me is why your sh (pid:26199) is not replacing itself with the script.
As we can see, another process (pid:26200) is spawned and it is the one that executes your script.
My blind guess is that PHP receives status code from 26199, which - for some reason - is not waiting
for 26200 or not passing the status code from it properly.
Can you check what is this producing?
-------------------------------
sh -c /tmp/te
echo $?
-------------------------------
Maybe the bug is not in PHP...
------------------------------------------------------------------------
[2012-04-30 23:24:42] dcb at insomniacsoft dot com
Still getting -1 for /bin/ls as well
I did the strace, here is output, unfortunately I have no idea how to interpret
it:
[pid 26199] execve("/bin/sh", ["sh", "-c", "/tmp/te"], [/*
19 vars */]
<unfinished
...>
[pid 26200] execve("/tmp/te", ["/tmp/te"], [/* 19 vars */]) = 0
[pid 26200] open("/tmp/te", O_RDONLY) = 3
write(1, "/tmp/te", 7/tmp/te) = 7
------------------------------------------------------------------------
[2012-04-29 06:36:21] phpmpan at mpan dot pl
Maybe strace shows something interesting?
strace -f php -r '$descriptorspec = array(
0 => array("pipe", "r"),
1 => array("pipe", "w"),
2 => array("file", "/tmp/error-output.txt", "a")
);
$p = proc_open("/tmp/te", $descriptorspec, $pipes, "/tmp");
sleep(1);
fclose($pipes[0]);fclose($pipes[1]);
$s = proc_get_status($p);
print_r($s);' 2>&1 | grep '/tmp/te'
------------------------------------------------------------------------
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