Function queue_write_msg 

pub unsafe extern "C" fn queue_write_msg(
    s: *mut queue_state_t,
    buf: *const u8,
    len: c_int,
) -> c_int

Write a message to a queue. \brief Write a message to a queue. \param s The queue context. \param buf The buffer from which the message will be written. \param len The length of the message. \return The number of bytes actually written.