Line-in jack sense with C/C++ in Ubuntu

Question

This has probably been asked to death around here, but I could never get to a final solution (probably for good cause).

Anyway, is there any way in Ubuntu (I use Ubu

Answer 1

The jack detection API is (here or here):

snd_jack_new — Create a new jack
snd_jack_set_parent — Set the parent device for a jack
snd_jack_report — Report the current status of a jack