S_ISBLK          623 file.c         #	define S_ISBLK(m) ((m & S_IFMT) == S_IFBLK)
S_ISBLK          625 file.c         #	define S_ISBLK(m) (0)  /* anytime false */
S_ISBLK          239 win32/win32.h  #define S_ISBLK(m)  (((unsigned short)(m) & S_IFMT) == S_IFBLK)