ref: 3f1b3e7a7b4735ce4b796b174986d52dccdc1fa7
dir: /include/bits/darwin/sys.h/
#define O_RDONLY 0x00000000 #define O_WRONLY 0x00000001 #define O_RDWR 0x00000002 #define O_ACCMODE 0x00000003 #define O_TRUNC 0x00000400 #define O_APPEND 0x00000008 #define O_CREAT 0x00000200 #define AT_FDCWD -100 #define CLOCKS_PER_SEC ((clock_t) 1000000) #define RUSAGE_SELF 0 typedef int pid_t; extern pid_t _getpid(void); extern int _kill(pid_t, int); extern int _sigaction(int, struct sigaction *, struct sigaction *);