// Send places a new message onto the queue
func (mq MessageQueue) Send(mtyp int64, body []byte, flags *MQSendFlags) error {
b := make([]byte, len(body)+8)
copy(b[:8], serialize(mtyp))
copy(b[8:], body)
rc, err := C.msgsnd(
C.int(mq),
unsafe.Pointer(&b[0]),
C.size_t(len(body)),
C.int(flags.flags()),
)
if rc == -1 {
return err
}
return nil
}
// msgop(2)
// int msgsnd(int msqid, const void *msgp, size_t msgsz, int msgflg)
func msgsnd(key int, message []byte, buffer *C.sysv_msg, maxSize int, mtype int, flags int) error {
if len(message) > maxSize {
return errors.New(MessageBiggerThanBuffer)
}
msgSize := C.size_t(len(message))
buffer.mtype = C.long(mtype)
if msgSize > 0 {
C.memcpy(unsafe.Pointer(&buffer.mtext), unsafe.Pointer(&message[0]), msgSize)
}
_, err := C.msgsnd(C.int(key), unsafe.Pointer(buffer), msgSize, C.int(flags))
return err
}