Cygwin: set the FILE_ATTRIBUTE_ARCHIVE DOS attribute on file creation

Do this for normal files and symlinks, not for temporary files,
device files or unix sockets.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/exceptions.cc

@@ -157,7 +157,7 @@ cygwin_exception::open_stackdumpfile ()
       NTSTATUS status;
       /* Try to open it to dump the stack in it. */
       status = NtCreateFile (&h, GENERIC_WRITE | SYNCHRONIZE, &attr, &io,
-			     NULL, FILE_ATTRIBUTE_NORMAL, 0, FILE_OVERWRITE_IF,
+			     NULL, FILE_ATTRIBUTE_ARCHIVE, 0, FILE_OVERWRITE_IF,
 			     FILE_SYNCHRONOUS_IO_NONALERT
 			     | FILE_OPEN_FOR_BACKUP_INTENT, NULL, 0);
       if (NT_SUCCESS (status))

winsup/cygwin/fhandler.cc

@@ -649,7 +649,8 @@ fhandler_base::open (int flags, mode_t mode)
 
       if (flags & (O_CREAT | O_TMPFILE))
 	{
-	  file_attributes |= FILE_ATTRIBUTE_NORMAL;
+	  file_attributes |= (flags & O_TMPFILE)
+			     ? FILE_ATTRIBUTE_NORMAL : FILE_ATTRIBUTE_ARCHIVE;
 
 	  if (pc.fs_is_nfs ())
 	    {

winsup/cygwin/path.cc

@@ -1945,7 +1945,7 @@ symlink_wsl (const char *oldpath, path_conv &win32_newpath)
   status = NtCreateFile (&fh, DELETE | FILE_GENERIC_WRITE
 			     | READ_CONTROL | WRITE_DAC,
 			 win32_newpath.get_object_attr (attr, sec_none_nih),
-			 &io, NULL, FILE_ATTRIBUTE_NORMAL,
+			 &io, NULL, FILE_ATTRIBUTE_ARCHIVE,
 			 FILE_SHARE_VALID_FLAGS, FILE_CREATE,
 			 FILE_SYNCHRONOUS_IO_NONALERT
 			 | FILE_NON_DIRECTORY_FILE
@@ -2264,7 +2264,7 @@ symlink_worker (const char *oldpath, path_conv &win32_newpath, bool isdevice)
 
       status = NtCreateFile (&fh, access,
 			     win32_newpath.get_object_attr (attr, sec_none_nih),
-			     &io, NULL, FILE_ATTRIBUTE_NORMAL,
+			     &io, NULL, FILE_ATTRIBUTE_ARCHIVE,
 			     FILE_SHARE_VALID_FLAGS,
 			     isdevice ? FILE_OVERWRITE_IF : FILE_CREATE,
 			     FILE_SYNCHRONOUS_IO_NONALERT

winsup/cygwin/release/3.3.3

@@ -12,3 +12,7 @@ Bug Fixes
 
 - Fix showing DLL version info from native Windows tools.
   Addresses: https://cygwin.com/pipermail/cygwin/2021-November/249867.html
+
+- Fix long-standing problem that new files don't get created with the
+  FILE_ATTRIBUTE_ARCHIVE DOS attribute set.
+  Addresses: https://cygwin.com/pipermail/cygwin/2021-November/249909.html