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The mode field has the type encoded as an value in a field, not as a bit mask. Mask the mode with S_IFMT instead of each type to test. Otherwise, false positives are possible: eg S_ISDIR will return true for block devices because S_IFDIR = 0040000 and S_IFBLK = 0060000 since mode is masked with S_IFDIR instead of S_IFMT. These macros now match the similar definitions in tools/include/uapi/linux/stat.h. Signed-off-by: Warner Losh <imp@bsdimp.com> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>