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Bug #78883 fgets(STDIN) fails on Windows
Submitted: 2019-11-28 19:23 UTC Modified: 2019-12-03 07:51 UTC
Votes:4
Avg. Score:5.0 ± 0.0
Reproduced:4 of 4 (100.0%)
Same Version:4 (100.0%)
Same OS:4 (100.0%)
From: php at nztm dot net Assigned: cmb (profile)
Status: Closed Package: Streams related
PHP Version: 7.4.0 OS: Windows 10 x64
Private report: No CVE-ID: None
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 [2019-11-28 19:23 UTC] php at nztm dot net 
Description:
------------
On Linux, fgets(STDIN) asks the user for input and returns the results, but this fails on Windows - it immediately returns false. On PHP 7.3 it works on Linux and Windows fine. 

Test script:
---------------
var_dump(fgets(STDIN)); // Try on Windows and Linux, PHP 7.4.0

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 [2019-11-28 23:10 UTC] cmb@php.net
-Status: Open +Status: Verified -Assigned To: +Assigned To: cmb
 [2019-11-28 23:10 UTC] cmb@php.net 
Thanks for reporting!
 [2019-11-29 07:53 UTC] julien dot boudry at gmail dot com 
Hi,

This happens since 7.4 RC5, working well on RC4 !
 [2019-11-29 08:34 UTC] cmb@php.net 
> This happens since 7.4 RC5, working well on RC4 !

For me, it fails with RC4 as well.  Apparently, the issue has been
caused by commit 9ec61e4[1], which is shipped as of 7.4.0RC2.

[1] <http://git.php.net/?p=php-src.git;a=commit;h=9ec61e43d453aadab9539f6814e8694295aa1ed1>
 [2019-11-29 08:49 UTC] julien dot boudry at gmail dot com 
Ok, In fact, I have tested under higer level code, so probably you are right. ( https://github.com/symfony/symfony/issues/34702 . This one, I'm sur 100% it's RC5 on two differents Windows 10 up to date installation.

I will try to switch on RC4 and tell you if it's working. If I not answer, consider that you are right.
 [2019-11-29 12:08 UTC] cmb@php.net 
The behavioral change has been introduced with commit d05deaa[1],
which has been squashed in to the commit mentioned above.  That
change is necessary to avoid that ftell() gets called on character
files, which would render the return value to be undefined[2].
What has been missed in this commit, is to properly adjust
self->is_pipe_blocking (which is a Windows only flag), to avoid
calling PeekNamedPipe() on characters files, which is not
supported[3].

[1] <https://github.com/php/php-src/pull/4684/commits/d05deaad69dfc1e578bd690923cb573c2e6583c9>
[2] <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/ftell-ftelli64?view=vs-2019#return-value>
[3] <https://docs.microsoft.com/en-us/windows/win32/api/namedpipeapi/nf-namedpipeapi-peeknamedpipe#parameters>
 [2019-11-29 12:18 UTC] cmb@php.net 
The following pull request has been associated:

Patch Name: Fix #78883: fgets(STDIN) fails on Windows
On GitHub:  https://github.com/php/php-src/pull/4952
Patch:      https://github.com/php/php-src/pull/4952.patch
 [2019-12-02 15:54 UTC] cmb@php.net 
Automatic comment on behalf of cmbecker69@gmx.de
Revision: http://git.php.net/?p=php-src.git;a=commit;h=996f217aa5487ead468fd8edc3ef278fb0686c32
Log: Fix #78883: fgets(STDIN) fails on Windows
 [2019-12-02 15:54 UTC] cmb@php.net
-Status: Verified +Status: Closed
 [2019-12-03 07:51 UTC] cmb@php.net 
Windows snapshots containing the fix for this bug are available at
<https://windows.php.net/downloads/snaps/php-7.4/r996f217/>.
 
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