ref: 8e212d00e17c23b79489215d6cc41da22381a550
dir: /lib/c/syscall.h/
extern void *_brk(void *addr); extern int _open(const char *path, int flags); extern int _close(int fd); extern int _read(int fd, void *buf, size_t n); extern int _write(int fd, void *buf, size_t n); extern int _lseek(int fd, long off, int whence); extern void _Exit(int status); extern int _access(char *path, int mode);