• STANDARD I/O LOW LEVEL API
• File Descriptor Operations
• int open(char *filename, int flags)
• int dup(int fd)
• int dup2(int fdsrc, int fddst)
• int filter(?)
• int pipe(int fd[2])
• int close(int fd)
• void closeall(void)
• File Positioning
• long lseek_callee(int fd, long offset, int whence)
• Direct Input and Output
• int readbyte(int fd)
• int writebyte(int fd, int c)
• int read(int fd, void *dst, int size)
• int write(int fd, void *src, int size)
• Device Driver
• int fsync(int fd)
• int ioctl(int fd, int request, int arg)
• int poll(struct pollfd fds[], uint nfds, uint timeout=0)
• int pollfd(int fd, char event)
• void *setdefdev(void *driver_function)