[newlib-cygwin/main] Cygwin: dirent.h: make definition of struct __DIR opaque

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=5353cb8ef8a5cf411ee3c3518edfd6f472abbe58

commit 5353cb8ef8a5cf411ee3c3518edfd6f472abbe58
Author:     Corinna Vinschen <corinna@vinschen.de>
AuthorDate: Tue Jan 23 16:09:02 2024 +0100
Commit:     Corinna Vinschen <corinna@vinschen.de>
CommitDate: Wed Jan 31 20:11:57 2024 +0100

    Cygwin: dirent.h: make definition of struct __DIR opaque
    
    The content of DIR should never have been exposed into userspace.
    Move struct __DIR to local dirent.h and only keep forward declaration
    in exported dirent.h.
    
    This allows to tweak the structure in future, for instance, to
    add thread-safety.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/include/sys/dirent.h    | 18 ++----------------
 winsup/cygwin/local_includes/dirent.h | 30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 16 deletions(-)

diff --git a/winsup/cygwin/include/sys/dirent.h b/winsup/cygwin/include/sys/dirent.h
index 668c870295b4..dae324a7f6f6 100644
--- a/winsup/cygwin/include/sys/dirent.h
+++ b/winsup/cygwin/include/sys/dirent.h
@@ -1,4 +1,4 @@
-/* Posix dirent.h for WIN32.
+/* Posix dirent.h
 
    This software is a copyrighted work licensed under the terms of the
    Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
@@ -41,21 +41,7 @@ struct dirent
 
 #define d_fileno d_ino			/* BSD compatible definition */
 
-#define __DIRENT_COOKIE 0xcdcd8484
-
-typedef struct __DIR
-{
-  /* This is first to set alignment in non _LIBC case.  */
-  unsigned long __d_cookie;
-  struct dirent *__d_dirent;
-  char *__d_dirname;			/* directory name with trailing '*' */
-  __int32_t __d_position;			/* used by telldir/seekdir */
-  int __d_fd;
-  uintptr_t __d_internal;
-  void *__handle;
-  void *__fh;
-  unsigned __flags;
-} DIR;
+typedef struct __DIR DIR;
 
 #if __BSD_VISIBLE
 #ifdef _DIRENT_HAVE_D_TYPE
diff --git a/winsup/cygwin/local_includes/dirent.h b/winsup/cygwin/local_includes/dirent.h
new file mode 100644
index 000000000000..075b762ce922
--- /dev/null
+++ b/winsup/cygwin/local_includes/dirent.h
@@ -0,0 +1,30 @@
+/* dirent.h: define struct __DIR
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef _CYGWIN_DIRENT_H
+#define _CYGWIN_DIRENT_H
+
+#include_next <dirent.h>
+
+#define __DIRENT_COOKIE 0xcdcd8484
+
+struct __DIR
+{
+  /* This is first to set alignment in non _LIBC case.  */
+  unsigned long	__d_cookie;
+  struct dirent	*__d_dirent;
+  char		*__d_dirname;		/* directory name with trailing '*' */
+  __int32_t	 __d_position;		/* used by telldir/seekdir */
+  int		 __d_fd;
+  uintptr_t	 __d_internal;
+  void		*__handle;
+  void		*__fh;
+  unsigned	 __flags;
+};
+
+#endif /* _CYGWIN_DIRENT_H */