+ test-open: support mingw errno values
+ * tests/test-open.h (test_open): Relax test.
+ * tests/test-fopen.h (test_fopen): Likewise.
+ * tests/test-openat-safer.c (main): Likewise.
+
+ open: fix opening directory on mingw
+ * lib/open.c (open) [REPLACE_OPEN_DIRECTORY]: Correct typo.
+
+ test-open: on GNU/Hurd, /dev/null is a directory
+ * tests/test-fopen.h (main): Rename...
+ (test_fopen): ...to this. Use a guaranteed non-directory when
+ confirming open behavior on trailing slash.
+ * tests/test-openat-safer.c (main): Likewise.
+ * tests/test-open.h (main): Likewise....
+ (test_open): ...to this.
+ * tests/test-fopen.c (main): Adjust caller.
+ * tests/test-fopen-safer.c (main): Likewise.
+ * tests/test-open.c (main): Likewise.
+ * tests/test-fcntl-safer.c (main): Likewise.
+ Reported by Samuel Thibault.
+