S_ISREG          720 file.c         #   define S_ISREG(m) ((m & S_IFMT) == S_IFREG)
S_ISREG          671 io.c           #   define S_ISREG(m) ((m & S_IFMT) == S_IFREG)
S_ISREG          241 win32/win32.h  #define S_ISREG(m)  (((unsigned short)(m) & S_IFMT) == S_IFREG)