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Date: | Wed, 19 Aug 2015 08:46:01 +0300 |
Message-ID: | <CAGHpTB+O-Z3Mir-4ZV7Wmh3dqo=rqfy+-CAW_KCE2hQdCjhB5w@mail.gmail.com> |
Subject: | Re: FindFirstFile fails for some network directories |
From: | Orgad Shaneh <orgads AT gmail DOT com> |
To: | cygwin AT cygwin DOT com |
On Mon, Aug 17, 2015 at 3:03 PM, Orgad Shaneh <orgads AT gmail DOT com> wrote: > Hi, > > I have 2 network shares with similar contents: > \\netapp1\CM\CompilationResults > \\aclnas01\versions\CompilationResults > > Trying to list all the files within these directories using Ruby > succeeds for netapp1, but fails for aclnas01. > > The failing ruby command is: > ruby -e "print Dir.glob('//aclnas01/versions/CompilationResults/*')" > > The exact same command succeeds when executed from a normal command > prompt, or when the directory is on netapp1 (on both shells). > > After debugging Ruby, I found out that FindFirstFile returns an > INVALID_HANDLE when invoked from cygwin environment. > > The following application succeeds on command prompt and fails on cygwin: > > #include <stdio.h> > #include <windows.h> > > int main() > { > const TCHAR *aclnas = TEXT("//aclnas01/versions/CompilationResults"); > const TCHAR *netapp = TEXT("//netapp1/CM/CompilationResults"); > > WIN32_FIND_DATA fd; > printf("%d\n", FindFirstFile(aclnas, &fd) != > INVALID_HANDLE_VALUE); // Fails on cygwin > printf("%d\n", FindFirstFile(netapp, &fd) != > INVALID_HANDLE_VALUE); // Always succeeds > return 0; > } > > Output on cmd is 1 1, on cygwin it is 0 1. > > Process Monitor shows that when executed from cygwin, CreateFile is > called with Open for Backup flag. I can't say for sure if this causes > the failure, but that's the only difference I could find between these > executions. > > This bug was previously reported on github/msys2[1], but it wasn't solved. > > I only have read access to these servers, but I might have cooperation > of the sys admin (can't promise though). > > Any help will be appreciated. > > Thanks, > - Orgad > > [1] https://github.com/Alexpux/MSYS2-packages/issues/242 Hi, Using Wireshark, I discovered that aclnas01 uses SMB, while netapp1 uses SMB2. For some reason, when executed from command prompt, a FIND_FIRST2 request is sent and the server replies, while with cygwin a "NT Create AndX" request is sent and denied. To minimize the captured packets, I executed the application twice, and captured only the second execution (to avoid session initiation). Working capture: https://gist.github.com/orgads/d2681881668afb9cb08f Failing capture: https://gist.github.com/orgads/4f0ea2b26cfd64f4353d Does cygwin implement SMB on its own, or is this difference a side-effect of the "Backup Intent" flag? - Orgad -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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