//go:build linux

package main

import (
	"os"

	"golang.org/x/sys/unix"
)

func redirectStderr(f *os.File) {
	if f == nil {
		// Silence altogether if no debug file
		null, err := os.OpenFile(os.DevNull, os.O_WRONLY, 0)
		if err == nil {
			_ = unix.Dup2(int(null.Fd()), int(os.Stderr.Fd()))
		}
		return
	}

	// Redirect fd 2 (stderr) to our debug file
	// This captures C-level library noise (ALSA, PortAudio) into the log
	_ = unix.Dup2(int(f.Fd()), int(os.Stderr.Fd()))
}