ISBLK
#define ISBLK(A) ((A.st_mode & S_IFMT) == S_IFBLK)
#define ISBLK(A) ((A.st_mode & S_IFMT) == S_IFBLK)
#define ISBLK(A) ((A.st_mode & S_IFMT) == S_IFBLK)
#define ISBLK(A) ((A.st_mode & S_IFMT) == S_IFBLK)