Linux 6.5 adds a constant AT_HANDLE_FID; add it to glibc. Because
this is a flag for the function name_to_handle_at declared in
bits/fcntl-linux.h, put the flag there rather than alongside other
AT_* flags in (OS-independent) fcntl.h.
Tested for x86_64.
# define MAX_HANDLE_SZ 128
#endif
+#ifdef __USE_GNU
+/* Flags for name_to_handle_at. See comment in fcntl.h about the use
+ of the same AT_* flag bits for different purposes in different
+ functions. */
+# define AT_HANDLE_FID AT_REMOVEDIR /* File handle is needed
+ to compare object
+ identity and may not
+ be usable to
+ open_by_handle_at. */
+#endif
+
__BEGIN_DECLS
#ifdef __USE_GNU