S_ISBLK
#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
#define S_ISBLK(m) (((m)&S_IFMT) == S_IFBLK)