Enable `termios` stdlib module (terminal I/O control)

[ppenna]

Summary

Enable the termios C extension module, which provides POSIX terminal I/O control.

Current State

Commented out in Modules/Setup.stdlib:

#termios termios.c

Why Enable It

• tty module depends on termios for raw/cbreak mode
• getpass.getpass() uses termios to disable echo for password input
• readline module integration depends on terminal attribute control
• Interactive Python REPL terminal handling
• Required for proper signal handling in terminal applications

Work Required

1. Uncomment in Modules/Setup.stdlib:

   termios termios.c
   

2. Nanvix POSIX API requirements:
   • tcgetattr(fd, termios_p) — get terminal attributes
   • tcsetattr(fd, optional_actions, termios_p) — set terminal attributes
   • tcsendbreak(fd, duration) — send break
   • tcdrain(fd) — wait for output to drain
   • tcflush(fd, queue_selector) — flush terminal I/O
   • tcflow(fd, action) — suspend/resume terminal I/O
   • cfgetispeed() / cfgetospeed() — get baud rates
   • cfsetispeed() / cfsetospeed() — set baud rates
3. Required headers: <termios.h>, <sys/ioctl.h>
4. Terminal ioctls needed: TIOCGWINSZ (get window size) — used by os.get_terminal_size()
5. Build and test: python -c "import termios; print(termios.B9600)"

POSIX API Dependencies

API	Purpose
tcgetattr()	Get terminal attributes
tcsetattr()	Set terminal attributes
tcdrain()	Wait for output drain
tcflush()	Flush I/O queues
tcflow()	Suspend/resume I/O
cfget/setispeed()	Baud rate control

Complexity

Medium — requires Nanvix terminal subsystem to support termios APIs.

Source Files

• Modules/termios.c