[PATCH] Cygwin: termios: Follow symlink in is_console_app()

[Takashi Yano]

>From cygwin 3.6.0, WSL cannot start by distribution name such as
debian.exe, which has '.exe' extention but actually is a symlink.
This is because is_console_app () returns false for that symlink.
This patch fixes the issue using PC_SYM_FOLLOW option in path_conv.

Fixes: a commit between cygwin 3.5.7 and 3.6.0
Reviewed-by:
Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
---
 winsup/cygwin/fhandler/termios.cc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/fhandler/termios.cc b/winsup/cygwin/fhandler/termios.cc
index 19d6220bc..1026b6969 100644
--- a/winsup/cygwin/fhandler/termios.cc
+++ b/winsup/cygwin/fhandler/termios.cc
@@ -704,8 +704,14 @@ fhandler_termios::fstat (struct stat *buf)
 static bool
 is_console_app (const WCHAR *filename)
 {
+  UNICODE_STRING upath;
+  RtlInitCountedUnicodeString (&upath, filename,
+			       wcslen (filename) * sizeof (WCHAR));
+  path_conv pc (&upath);
+  WCHAR *native_path = pc.get_nt_native_path ()->Buffer;
+
   HANDLE h;
-  h = CreateFileW (filename, GENERIC_READ, FILE_SHARE_READ,
+  h = CreateFileW (native_path, GENERIC_READ, FILE_SHARE_READ,
 		   NULL, OPEN_EXISTING, 0, NULL);
   char buf[1024];
   DWORD n;
-- 
2.51.0