Description

This function brings the PPP connection down. The handle argument is the result of a successful call to cyg_ppp_up(). This function only signals to the PPP subsystem that the link should be brought down. The link will be terminated asynchronously. If the application needs to wait for the link to terminate, then it should call cyg_ppp_wait_down() after calling cyg_ppp_down().

The function returns zero if it was able to start the termination of the PPP connection successfully. It will return -1 if the connection is not running, or if it could not otherwise start the termination.