From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from aserp2130.oracle.com (aserp2130.oracle.com [141.146.126.79]) by sourceware.org (Postfix) with ESMTPS id 558E83971C26 for ; Fri, 25 Sep 2020 14:31:44 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 558E83971C26 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08PETetI010275; Fri, 25 Sep 2020 14:31:39 GMT Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by aserp2130.oracle.com with ESMTP id 33qcpuaxnq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 25 Sep 2020 14:31:39 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08PEQXVU008755; Fri, 25 Sep 2020 14:29:38 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3020.oracle.com with ESMTP id 33nurxvh7g-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 25 Sep 2020 14:29:38 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 08PETbn7030805; Fri, 25 Sep 2020 14:29:37 GMT Received: from dhcp-10-175-16-155.vpn.oracle.com (/10.175.16.155) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 25 Sep 2020 07:29:37 -0700 Subject: Re: Problems with native Unix domain sockets on Win 10/2019 To: Ken Brown , cygwin@cygwin.com References: <2b0aeab4-983d-e1d7-301f-edfeeb38cc85@oracle.com> <97d2b3af-224a-6873-fb4a-55a0ae9cd379@cornell.edu> From: Michael McMahon Message-ID: Date: Fri, 25 Sep 2020 15:29:35 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <97d2b3af-224a-6873-fb4a-55a0ae9cd379@cornell.edu> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9755 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 phishscore=0 mlxlogscore=999 bulkscore=0 mlxscore=0 suspectscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009250103 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9755 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=999 adultscore=0 bulkscore=0 mlxscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 spamscore=0 malwarescore=0 clxscore=1015 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009250103 X-Spam-Status: No, score=-3.5 required=5.0 tests=BAYES_00, BODY_8BITS, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_PASS, SPF_PASS, TXREP, UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Sep 2020 14:31:46 -0000 On 25/09/2020 14:19, Ken Brown wrote: > On 9/24/2020 8:01 AM, Michael McMahon wrote: >> >> >> On 24/09/2020 12:26, Ken Brown wrote: >>> On 9/23/2020 7:25 AM, Michael McMahon via Cygwin wrote: >>>> Hi, >>>> >>>> I searched for related issues but haven't found anything. >>>> >>>> I am having some trouble with Windows native Unix domain sockets >>>> (a recent feature in Windows 10 and 2019 server) and Cygwin. >>>> I think I possibly know the cause since I had to investigate a similar >>>> looking issue on another platform built on Windows. >>>> >>>> The problem is that cygwin commands don't seem to recognise native Unix >>>> domain sockets correctly. For example, the socket "foo.sock" should >>>> have the same ownership and similar permissions to other files >>>> in the example below: >>>> >>>> $ ls -lrt >>>> total 2181303 >>>> >>>> -rw-r--r--  1 mimcmah      None             1259   Sep 23 10:22 test.c >>>> -rwxr-xr-x  1 mimcmah      None             3680   Sep 23 10:22 >>>> test.obj >>>> -rwxr-xr-x  1 mimcmah      None             121344 Sep 23 10:22 >>>> test.exe >>>> -rw-r-----  1 Unknown+User Unknown+Group         0 Sep 23 10:23 >>>> foo.sock >>>> -rw-r--r--  1 mimcmah      None             144356 Sep 23 10:27 >>>> check.ot >>>> >>>> A bigger problem is that foo.sock can't be deleted with the cygwin "rm" >>>> command. >>>> >>>> $ rm -f foo.sock >>>> rm: cannot remove 'foo.sock': Permission denied >>>> >>>> $ chmod 777 foo.sock >>>> chmod: changing permissions of 'foo.sock': Permission denied >>>> >>>> $ cmd /c del foo.sock >>>> >>>> But, native Windows commands are okay, as the third example shows. >>>> >>>> I think the problem may relate to the way native Unix domain sockets >>>> are >>>> implemented in Windows and the resulting special handling required. >>>> They are implemented as NTFS reparse points and when opening them >>>> with CreateFile, you need to specify the FILE_FLAG_OPEN_REPARSE_POINT >>>> flag. Otherwise, you get an ERROR_CANT_ACCESS_FILE. There are other >>>> complications unfortunately, which I'd be happy to discuss further. >>>> >>>> But, to reproduce it, you can compile the attached code snippet >>>> which creates foo.sock in the current directory. Obviously, this >>>> only works on recent versions of Windows 10 and 2019 server. >>> >>> Cygwin doesn't currently support native Windows AF_UNIX sockets, as >>> you've discovered.  See >>> >>> https://urldefense.com/v3/__https://cygwin.com/pipermail/cygwin/2020-June/245088.html__;!!GqivPVa7Brio!P7lIFI4rYAtWh8_DtCbRCxT-M_E4vwQ0qwzQ0p656T73BpJ0jbUkLI_bXdA6mmSL9lJcSQ$ >>> >>> for the current state of AF_UNIX sockets on Cygwin, including the >>> possibility of using native Windows AF_UNIX sockets on systems that >>> support them. >>> >>> If all you want is for Cygwin to recognize such sockets and allow you >>> to apply rm, chmod, etc., I don't think it would be hard to add that >>> capability.  But I doubt if that's all you want. >>> >>> Further discussion of this will have to wait until Corinna is available. >>> >> >> Thanks for the info. It's mainly about recognition of sockets for >> regular commands. Since these objects can exist on Windows filesystems >> now, potentially created by any kind of Windows application, >> it would be great if Cygwin could handle them, irrespective of whether >> the Cygwin development environment does. Though that sounds like a >> good idea too. > > I think this has a simple fix (attached), but I can't easily test it > because your test program doesn't compile for me.  First, I got > > $ gcc -o native_unix_socket native_unix_socket.c > native_unix_socket.c:5:10: fatal error: WS2tcpip.h: No such file or > directory >     5 | #include >       |          ^~~~~~~~~~~~ > compilation terminated. > > I fixed this by making the include file name lower case.  (My system is > case sensitive, so it matters.) > > Next: > > $ gcc -o native_unix_socket native_unix_socket.c > native_unix_socket.c:8:10: fatal error: afunix.h: No such file or directory >     8 | #include >       |          ^~~~~~~~~~ > compilation terminated. > > There's no file afunix.h in the Cygwin distribution, but I located it > online and pasted in the contents.  The program now compiles but fails > to link: > > $ gcc -o native_unix_socket native_unix_socket.c > /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: > /tmp/cc74urPr.o:native_unix_socket.c:(.text+0x3b): undefined reference > to `__imp_WSAStartup' > /tmp/cc74urPr.o:native_unix_socket.c:(.text+0x3b): relocation truncated > to fit: R_X86_64_PC32 against undefined symbol `__imp_WSAStartup' > /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: > /tmp/cc74urPr.o:native_unix_socket.c:(.text+0xf2): undefined reference > to `__imp_WSAGetLastError' > /tmp/cc74urPr.o:native_unix_socket.c:(.text+0xf2): relocation truncated > to fit: R_X86_64_PC32 against undefined symbol `__imp_WSAGetLastError' > /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: > /tmp/cc74urPr.o:native_unix_socket.c:(.text+0x13d): undefined reference > to `__imp_WSAGetLastError' > /tmp/cc74urPr.o:native_unix_socket.c:(.text+0x13d): relocation truncated > to fit: R_X86_64_PC32 against undefined symbol `__imp_WSAGetLastError' > collect2: error: ld returned 1 exit status > > This is probably easy to fix too, but I don't feel like tracking it > down. Please send compilation instructions (that use Cygwin tools). > > Ken Hi Sorry, I had compiled it in a native Visual C environment. Assuming you have afunix.h in the current directory. gcc -o native_unix_socket -I. native_unix_socket.c -lws2_32 should do it. Michael.