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Bug #76086 Unable to write to php://stderr
Submitted: 2018-03-13 05:11 UTC Modified: 2022-08-01 19:00 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: chris at modd dot com dot au Assigned:
Status: Open Package: CGI/CLI related
PHP Version: 7.2.3 OS: *
Private report: No CVE-ID: None
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From: chris at modd dot com dot au
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 [2018-03-13 05:11 UTC] chris at modd dot com dot au 
Description:
------------
Can no longer output to STDERR using file_put_contents. Used to work fine in PHP 5.x.
Also Affects 7.1.x

Test script:
---------------
<?php

$msg = "Error Occurred\n";
file_put_contents("php://stderr", $msg);


Expected result:
----------------
Error Occurred written to console on stderr

Actual result:
--------------
Rather than stderr output error message, I get a warning:
Only 0 of 15 bytes written, possibly out of free diskspace in script.php on line 3

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 [2018-03-13 05:20 UTC] chris at modd dot com dot au 
This problem only seems to be a problem when using php-cgi
 [2018-03-13 05:20 UTC] chris at modd dot com dot au 
This problem only seems to be a problem when using php-cgi
 [2018-03-13 09:16 UTC] ab@php.net
-Status: Open +Status: Feedback
 [2018-03-13 09:16 UTC] ab@php.net 
Thanks for the report. I see this when running your snippet

$ php-cgi.exe bug76086.php 1>nul
Error Occurred

How exactly teh issue can be reproduced?

Thanks.
 [2018-03-13 21:50 UTC] chris at modd dot com dot au
-Status: Feedback +Status: Open
 [2018-03-13 21:50 UTC] chris at modd dot com dot au 
I only get the error when running via fast-cgi. I am not sure how to reproduce this without running a webserver.
 [2018-03-14 00:16 UTC] chris at modd dot com dot au 
Ok, I have found the bug more specifically.

You will need the cgi-fcgi command util from ubuntu/debian package: libfcgi0ldbl

Run fcgi server in dir with bugs76086.php script

PHP_FCGI_CHILDREN=1 php-cgi -b 127.0.0.1:9000

Then send a request from cli:

SCRIPT_NAME=bug76086.php SCRIPT_FILENAME=bug76086.php REQUEST_METHOD=GET cgi-fcgi -bind -connect 127.0.0.1:9000

returns (from cgi-fci command, not terminal running php-cgi):
PHP Warning:  file_put_contents(): Only 0 of 2 bytes written, possibly out of free disk space in C:\Users\chris\bug76086.php on line 5
<br />
 [2018-03-14 17:23 UTC] ab@php.net
-Status: Open +Status: Feedback
 [2018-03-14 17:23 UTC] ab@php.net 
Thanks for the further info. libfcgi0ldbl is not a package from the PHP distribution. It is also unlikely available on Windows. Thus, seems it's not a PHP bug. From what is shown, i guess it's about the port doesn't get reused or similar. If there's a repro regarding PHP, please post, otherwise it's probably to be marked as not a bug.

Thanks.
 [2018-03-14 21:09 UTC] chris at modd dot com dot au
-Status: Feedback +Status: Open
 [2018-03-14 21:09 UTC] chris at modd dot com dot au 
I am ONLY using the libfcgi0ldbl as a stand-in for running a webserver.

It fails exactly the same way using Apache with fastcgi, nginx with fastacgi and using a PHP fastcgi client. If you prefer I can write an example that uses the fcgi client used by the php unit tests.

https://github.com/php/php-src/blob/master/sapi/fpm/tests/fcgi.inc

using the cgi-fcgi package just means the example is simple to try and run and with Bash for windows, its easy enough to run it on windows too.
 [2018-03-14 21:25 UTC] aharvey@php.net 
I can't reproduce this on Linux, so this looks Windows-specific.
 [2018-03-19 23:01 UTC] cmb@php.net 
> If you prefer I can write an example that uses the fcgi client
> used by the php unit tests.

That would be great, since we prefer to have a PHPT regression
test to go along with the actual bug fix, anyway.
 [2020-09-22 09:15 UTC] cmb@php.net
-Operating System: Windows +Operating System: *
 [2020-09-22 09:15 UTC] cmb@php.net 
> Used to work fine in PHP 5.x.

Not with PHP 5.6.40 on Windows.  Actually, this doesn't look like
a Windows specific issue to me, but rather depends on whether
stderr is actually writable.  Since php://stderr does not refer to
the multiplexed FCGI standard error stream[1], there may be no
stderr at all.

See also bug #79905.

[1] <https://bugs.php.net/bug.php?id=31472>
 [2022-08-01 19:00 UTC] bukka@php.net
-Package: Streams related +Package: CGI/CLI related
 [2022-08-01 19:00 UTC] bukka@php.net 
This is up to SAPI to handle correctly. FPM has got a logic around this so this really seems to me like a CGI sapi related problem which is what I assume is used here. There is not much that can be done on stream level.
 
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