Accept a queued connection
#include <libssh2.h>
LIBSSH2_CHANNEL * libssh2_channel_forward_accept(LIBSSH2_LISTENER *listener);
listener is a forwarding listener instance as returned by libssh2_channel_forward_listen_ex(3).
A newly allocated channel instance or NULL on failure.
When this function returns NULL use libssh2_session_last_errno(3) to extract the error code. If that code is LIBSSH2_ERROR_EAGAIN, the session is set to do non-blocking I/O but the call would block.