ngx::ffi

Function SSL_CTX_set_msg_callback

Source 
pub unsafe extern "C" fn SSL_CTX_set_msg_callback(
    ctx: *mut ssl_ctx_st,
    cb: Option<unsafe extern "C" fn(_: i32, _: i32, _: i32, _: *const c_void, _: usize, _: *mut ssl_st, _: *mut c_void)>,
)