Function moq_backends 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn moq_backends(
    dst: *mut moq_string,
    count: usize,
) -> i32

List the QUIC backends this build was compiled with.

Writes up to count names into dst and returns the total number available, which may be larger than count. Pass a NULL dst with a zero count to size the array first. Each name borrows a static string valid for the life of the process.

The backends are compile-time optional, so a caller building a menu must read this rather than listing names: an option this build lacks is rejected by moq_client_set_backend, which would leave a menu entry that can only fail.

Returns the total count on success, or a negative code on failure.

Safety

• The caller must ensure that dst is either NULL with a zero count, or a valid pointer to count writable moq_string values.