[PATCH] Cygwin: cygheap: Fix the issue of cygwin1.dll in the root directory.

[Ken Brown]

On 5/28/2022 10:20 AM, Takashi Yano wrote:
> - After the commit 6d898f43, cygwin fails to start if cygwin1.dll
>    is placed in the root directory. This patch fixes the issue.
> Addresses: https://cygwin.com/pipermail/cygwin/2022-May/251548.html
> ---
>   winsup/cygwin/cygheap.cc | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/winsup/cygwin/cygheap.cc b/winsup/cygwin/cygheap.cc
> index 01b49468e..1a817b743 100644
> --- a/winsup/cygwin/cygheap.cc
> +++ b/winsup/cygwin/cygheap.cc
> @@ -183,6 +183,11 @@ init_cygheap::init_installation_root ()
>   	  if (p)
>   	    p = wcschr (p + 1, L'\\');  /* Skip share name */
>   	}
> +      else /* Long path prefix followed by drive letter path */
> +	{
> +	  len = 4;
> +	  p += 4;
> +	}
>       }
>     installation_root_buf[1] = L'?';
>     RtlInitEmptyUnicodeString (&installation_key, installation_key_buf,

LGTM.

Ken