S_ISBLK            33 lib/stat_.h    # undef S_ISBLK
S_ISBLK            48 lib/stat_.h    #  define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
S_ISBLK            50 lib/stat_.h    #  define S_ISBLK(m) 0