Bug #76321 [Nab]: ftell(STDIN) returns 0 when no stdin is supplied

Edit report at https://bugs.php.net/bug.php?id=76321&edit=1 ID: 76321 Updated by: requinix@php.net Reported by: gadelat at gmail dot com Summary: ftell(STDIN) returns 0 when no stdin is supplied Status: Not a bug Type: Bug Package: Filesystem function related Operating System: Windows 10 PHP Version: 7.2.5 Block user comment: N Private report: N New Comment: If your application needs to process stdin and there isn't anything already in the buffer for it, it should wait. It sits and reads and/or waits until EOF. That's how filters normally operate. I'm not the most familiar with the subject but none of the tactics I just tried work. You might be out of luck. Previous Comments: ------------------------------------------------------------------------ [2018-05-10 22:04:41] gadelat at gmail dot com My application revolves around processing STDIN. As a first step I validate input. I check if user supplied stdin and exit if didn't. So is there no way to check for STDIN presence on Windows without hanging whole application? ------------------------------------------------------------------------ [2018-05-10 21:56:19] requinix@php.net That won't prevent there from being a stdin. You aren't using it, but it's still there. As for Linux, stdin is a FIFO (glorified buffer) and you can't ftell on a FIFO. Why is having stdin a problem? ------------------------------------------------------------------------ [2018-05-10 21:34:37] gadelat at gmail dot com Running the script via php test.php from cmd.exe, powershell or git bash. Tried both thread safe and non-thread safe php 7.2.5 versions. I'm doing it via Virtualbox. ------------------------------------------------------------------------ [2018-05-10 16:32:35] requinix@php.net What are you doing to not "provide" stdin? ------------------------------------------------------------------------ [2018-05-09 21:50:48] gadelat at gmail dot com Description: ------------ I'm trying to make my application work in Windows. Important part of that is to detect if STDIN was provided. I can't figure out how to do that in Windows. On Linux OS, following returns bool(false), in Windows int(0) var_dump(ftell(STDIN)); Other approaches have same problem, or indefinitely block application if no stdin was provided. Is there no way to reliably detect STDIN in Windows? Test script: --------------- var_dump(ftell(STDIN)); Expected result: ---------------- FALSE Actual result: -------------- 0 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=76321&edit=1