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Reply-To: Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Subject: Re: ls \\\\\?\\DRIVE\\ Aborted (core dumped)
To: cygwin AT cygwin DOT com
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From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
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Date: Mon, 23 Sep 2019 17:39:35 -0600
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On 2019-09-23 16:26, Andrey Repin wrote:
>> On 2019-09-23 09:02, Ken Brown wrote:
>>> On 9/23/2019 10:42 AM, Mark Zhitomirski wrote:
>>>> While trying different path names I've hit the following crash:
>>>> $ ls \\\\\?\\DRIVE\\
>>>> assertion "p >= path" failed: file
>>>> "/home/corinna/src/cygwin/cygwin-3.0.7/cygwin-3.0.7-1.x86_64/src/newlib-cygwin/winsup/cygwin/path.cc",
>>>> line 2916, function: int symlink_info::check(char*, const
>>>> suffix_info*, fs_info&, path_conv_handle&)
>>>> Aborted (core dumped)
> $ ls -ld \\\\\?\\C:\\
> drwxr-xr-x 1 anrdaemon None 0 сен 13 23:19 '\\?\C:\'
> WJFFM
>>> Thanks for the report.  I can confirm the crash.  I'll look into it.
>> Although:
>> $ ll $SYSTEMDRIVE\\
>> lists normally, the owner and group is the current user, whereas the correct
>> owners and groups are shown by:
>> $ ll /proc/cygdrive/c/
> That did not work for me, both show current user:group.
> For reference,
> fstab:
> none / cygdrive noacl,binary,nouser,posix=0 0 0
> $ mount
> C: on /c type ntfs (binary,noacl,posix=0,noumount,auto)
>> and Cygwin really does not like the entries in:
>> $ ll \\\\\?\\*\\
>> use of any name instead of *, or none causes a crash:
>> $ ll \\\\\?\\Boot\\
>> $ ll \\\\\?\\
> I wonder, what have you tried to reach here?

The Win 32 unlimited absolute path length file name space \\?\,
just as \\.\ is the Win 32 device name space:
https://docs.microsoft.com/en-ca/windows/win32/fileio/naming-a-file

Compare:
> fsutil fsinfo ntfsinfo \\.\C:
NTFS Volume Serial Number :        0x80ffb5d906b8d438
NTFS Version   :                   3.1
LFS Version    :                   2.0
Number Sectors :                   0x00000000744bc466
Total Clusters :                   0x000000000e89788c
Free Clusters  :                   0x0000000009861b37
Total Reserved :                   0x000000000000b4b0
Bytes Per Sector  :                512
Bytes Per Physical Sector :        4096
Bytes Per Cluster :                4096
Bytes Per FileRecord Segment    :  1024
Clusters Per FileRecord Segment :  0
Mft Valid Data Length :            0x00000000e4f00000
Mft Start Lcn  :                   0x00000000000ad74c
Mft2 Start Lcn :                   0x0000000000000002
Mft Zone Start :                   0x000000000522ce40
Mft Zone End   :                   0x0000000005239660
Max Device Trim Extent Count :     0
Max Device Trim Byte Count :       0x0
Max Volume Trim Extent Count :     62
Max Volume Trim Byte Count :       0x40000000

> fsutil fsinfo ntfsinfo C:
NTFS Volume Serial Number :        0x80ffb5d906b8d438
NTFS Version   :                   3.1
LFS Version    :                   2.0
Number Sectors :                   0x00000000744bc466
Total Clusters :                   0x000000000e89788c
Free Clusters  :                   0x0000000009861b37
Total Reserved :                   0x000000000000b4b0
Bytes Per Sector  :                512
Bytes Per Physical Sector :        4096
Bytes Per Cluster :                4096
Bytes Per FileRecord Segment    :  1024
Clusters Per FileRecord Segment :  0
Mft Valid Data Length :            0x00000000e4f00000
Mft Start Lcn  :                   0x00000000000ad74c
Mft2 Start Lcn :                   0x0000000000000002
Mft Zone Start :                   0x000000000522ce40
Mft Zone End   :                   0x0000000005239660
Max Device Trim Extent Count :     0
Max Device Trim Byte Count :       0x0
Max Volume Trim Extent Count :     62
Max Volume Trim Byte Count :       0x40000000
Resource Manager Identifier :      99B60DE5-842F-11E1-98AF-D71846560B56
					^ Object Identifier

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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