ref: 38d360b9a0c73d60a5e8e8df65854c53d6f145f5
dir: /include/bits/netbsd/sys.h/
#define O_RDONLY  0x00000000
#define O_WRONLY  0x00000001
#define O_RDWR    0x00000002
#define O_TRUNC   0x00000400
#define O_APPEND  0x00000008
#define O_CREAT   0x00000200
#define AT_FDCWD  -100
#define CLOCKS_PER_SEC ((clock_t) 100)
#define RUSAGE_SELF 0
typedef int pid_t;
struct sigaction {
	void (*sa_handler)(int);
	char sa_mask[8];
	int sa_flags;
};
extern pid_t _getpid(void);
extern int _kill(pid_t pid, int signum);
extern int _sigaction(int sig, struct sigaction *new, struct sigaction *old);