Bug #74090 [Fbk->Opn]: stream_get_contents maxlength>-1 returns empty string on windows

Edit report at https://bugs.php.net/bug.php?id=74090&edit=1 ID: 74090 User updated by: me at micksam7 dot com Reported by: me at micksam7 dot com Summary: stream_get_contents maxlength>-1 returns empty string on windows -Status: Feedback +Status: Open Type: Bug Package: Streams related Operating System: Windows 10 v1607 PHP Version: 7.1.1 Block user comment: N Private report: N New Comment: stream_socket_recvfrom() seems to work just fine in this case I submitted this bug after tracking down a problem with reactphp's dns resolver which uses a generic socket class and tracked it down to this function not behaving correctly on Windows. I've already reported it to reactphp and offered a few workarounds, but figured I should still submit this report given this function behaves differently between *nix and Windows with maxlength set. Previous Comments: ------------------------------------------------------------------------ [2017-02-13 11:47:38] ab@php.net Btw. question - why don't you use stream_socket_recvfrom()? The reason to fail here is a possible bug in the stream liveness check, need further tests. Thanks. ------------------------------------------------------------------------ [2017-02-13 08:02:05] ab@php.net Ah, err, to few coffee in the morning. The exact actual result, so verified. Thanks. ------------------------------------------------------------------------ [2017-02-13 07:56:25] ab@php.net Thanks for the report. I'm not reproducing this, here 7.0 through master string(0) "" string(45) "ւ�� ☺ ☺ example♥org ☺ ☺�♀ ☺ ☺ J� ♦]��"" Either it's some environment issue, or indeed some more investigation is needed. Thanks. ------------------------------------------------------------------------ [2017-02-13 05:05:04] me at micksam7 dot com Description: ------------ stream_get_contents() with any maxlength greater than -1 returns an empty string, This only appears to occur with UDP streams opened via stream_socket_client(), specifically on Windows 10. This problem doesn't occur on Linux and may function fine on older versions of Windows. The problem appears to reside somewhere in the php_stream_eof call within _php_stream_copy_to_mem - php_stream_eof seems to always return true on UDP streams on Windows 10 systems. More digging required. Test script: --------------- //Submit DNS Request $data = base64_decode("1oIBAAABAAAAAAAAB2V4YW1wbGUDb3JnAAABAAE="); $fd = stream_socket_client("udp://8.8.8.8:53", $errno, $errstr, 0, STREAM_CLIENT_CONNECT | STREAM_CLIENT_ASYNC_CONNECT); stream_set_blocking($fd, 0); stream_socket_sendto($fd,$data); sleep(1); var_dump(stream_get_contents($fd,65565)); //Does not work var_dump(stream_get_contents($fd)); //No maxlength, works fine stream_socket_shutdown($fd,STREAM_SHUT_RDWR); Expected result: ---------------- Returns a valid DNS response roughly 45 bytes long, then an empty string. string(45) "<>" string(0) "" Actual result: -------------- Returns an empty string, then a valid DNS response. string(0) "" string(45) "<>" ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=74090&edit=1