ref: 47d23949f797eeb99110bfad4cac4fbddc0081e0
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);
/* auxiliar functions */
#ifdef stdin
extern FILE *_fpopen(const char * restrict fname,
const char * restrict mode,
FILE * restrict fp);
#endif
#define O_WRONLY 1
#define O_RDONLY 2
#define O_RDWR 4
#define O_TRUNC 8
#define O_APPEND 16
#define O_CREAT 32