fsfw/osal/linux/MessageQueue.cpp

259 lines
8.8 KiB
C++

#include <framework/serviceinterface/ServiceInterfaceStream.h>
#include <fcntl.h> /* For O_* constants */
#include <sys/stat.h> /* For mode constants */
#include <mqueue.h>
#include <cstring>
#include <errno.h>
#include <framework/osal/linux/MessageQueue.h>
MessageQueue::MessageQueue(size_t message_depth, size_t max_message_size) :
id(0), lastPartner(0), defaultDestination(NO_QUEUE), internalErrorReporter(
NULL) {
//debug << "MessageQueue::MessageQueue: Creating a queue" << std::endl;
mq_attr attributes;
this->id = 0;
//Set attributes
attributes.mq_curmsgs = 0;
attributes.mq_maxmsg = message_depth;
attributes.mq_msgsize = max_message_size;
attributes.mq_flags = 0; //Flags are ignored on Linux during mq_open
//Set the name of the queue
sprintf(name, "/Q%u\n", queueCounter++);
//Create a nonblocking queue if the name is available (the queue is Read and writable for the owner as well as the group)
mqd_t tempId = mq_open(name, O_NONBLOCK | O_RDWR | O_CREAT | O_EXCL,
S_IWUSR | S_IREAD | S_IWGRP | S_IRGRP | S_IROTH | S_IWOTH, &attributes);
if (tempId == -1) {
//An error occured during open
//We need to distinguish if it is caused by an already created queue
if (errno == EEXIST) {
//There's another queue with the same name
//We unlink the other queue
int status = mq_unlink(name);
if (status != 0) {
error << "mq_unlink Failed with status: " << strerror(errno)
<< std::endl;
} else {
//Successful unlinking, try to open again
mqd_t tempId = mq_open(name,
O_NONBLOCK | O_RDWR | O_CREAT | O_EXCL,
S_IWUSR | S_IREAD | S_IWGRP | S_IRGRP, &attributes);
if (tempId != -1) {
//Successful mq_open
this->id = tempId;
return;
}
}
}
//Failed either the first time or the second time
error << "MessageQueue::MessageQueue: Creating Queue " << std::hex
<< name << std::dec << " failed with status: "
<< strerror(errno) << std::endl;
} else {
//Successful mq_open call
this->id = tempId;
}
}
MessageQueue::~MessageQueue() {
int status = mq_close(this->id);
if(status != 0){
error << "MessageQueue::Destructor: mq_close Failed with status: " << strerror(errno) <<std::endl;
}
status = mq_unlink(name);
if(status != 0){
error << "MessageQueue::Destructor: mq_unlink Failed with status: " << strerror(errno) <<std::endl;
}
}
ReturnValue_t MessageQueue::sendMessage(MessageQueueId_t sendTo,
MessageQueueMessage* message, bool ignoreFault) {
return sendMessageFrom(sendTo, message, this->getId(), false);
}
ReturnValue_t MessageQueue::sendToDefault(MessageQueueMessage* message) {
return sendToDefaultFrom(message, this->getId());
}
ReturnValue_t MessageQueue::reply(MessageQueueMessage* message) {
if (this->lastPartner != 0) {
return sendMessageFrom(this->lastPartner, message, this->getId());
} else {
//TODO: Good returnCode
return HasReturnvaluesIF::RETURN_FAILED;
}
}
ReturnValue_t MessageQueue::receiveMessage(MessageQueueMessage* message,
MessageQueueId_t* receivedFrom) {
ReturnValue_t status = this->receiveMessage(message);
*receivedFrom = this->lastPartner;
return status;
}
ReturnValue_t MessageQueue::receiveMessage(MessageQueueMessage* message) {
unsigned int messagePriority = 0;
int status = mq_receive(id,reinterpret_cast<char*>(message->getBuffer()),message->MAX_MESSAGE_SIZE,&messagePriority);
if (status > 0) {
this->lastPartner = message->getSender();
//Check size of incoming message.
if (message->messageSize < message->getMinimumMessageSize()) {
return HasReturnvaluesIF::RETURN_FAILED;
}
return HasReturnvaluesIF::RETURN_OK;
}else if(status==0){
//Success but no message received
return MessageQueueIF::EMPTY;
} else {
//No message was received. Keep lastPartner anyway, I might send something later.
//But still, delete packet content.
memset(message->getData(), 0, message->MAX_DATA_SIZE);
switch(errno){
case EAGAIN:
//O_NONBLOCK or MQ_NONBLOCK was set and there are no messages currently on the specified queue.
return MessageQueueIF::EMPTY;
case EBADF:
//mqdes doesn't represent a valid queue open for reading.
error << "MessageQueue::receive: configuration error " << strerror(errno) << std::endl;
/*NO BREAK*/
case EINVAL:
/*
* This value indicates one of the following:
* * The pointer to the buffer for storing the received message, msg_ptr, is NULL.
* * The number of bytes requested, msg_len is less than zero.
* * msg_len is anything other than the mq_msgsize of the specified queue, and the QNX extended option MQ_READBUF_DYNAMIC hasn't been set in the queue's mq_flags.
*/
error << "MessageQueue::receive: configuration error " << strerror(errno) << std::endl;
/*NO BREAK*/
case EMSGSIZE:
/*
* This value indicates one of the following:
* * the QNX extended option MQ_READBUF_DYNAMIC hasn't been set, and the given msg_len is shorter than the mq_msgsize for the given queue.
* * the extended option MQ_READBUF_DYNAMIC has been set, but the given msg_len is too short for the message that would have been received.
*/
error << "MessageQueue::receive: configuration error " << strerror(errno) << std::endl;
/*NO BREAK*/
case EINTR:
//The operation was interrupted by a signal.
default:
return HasReturnvaluesIF::RETURN_FAILED;
}
}
}
MessageQueueId_t MessageQueue::getLastPartner() const {
return this->lastPartner;
}
ReturnValue_t MessageQueue::flush(uint32_t* count) {
mq_attr attrib;
int status = mq_getattr(id,&attrib);
if(status != 0){
switch(errno){
case EBADF:
//mqdes doesn't represent a valid message queue.
error << "MessageQueue::flush configuration error, called flush with an invalid queue ID" << std::endl;
/*NO BREAK*/
case EINVAL:
//mq_attr is NULL
default:
return HasReturnvaluesIF::RETURN_FAILED;
}
}
*count = attrib.mq_curmsgs;
attrib.mq_curmsgs = 0;
status = mq_setattr(id,&attrib,NULL);
if(status != 0){
switch(errno){
case EBADF:
//mqdes doesn't represent a valid message queue.
error << "MessageQueue::flush configuration error, called flush with an invalid queue ID" << std::endl;
/*NO BREAK*/
case EINVAL:
/*
* This value indicates one of the following:
* * mq_attr is NULL.
* * MQ_MULT_NOTIFY had been set for this queue, and the given mq_flags includes a 0 in the MQ_MULT_NOTIFY bit. Once MQ_MULT_NOTIFY has been turned on, it may never be turned off.
*
*/
default:
return HasReturnvaluesIF::RETURN_FAILED;
}
}
return HasReturnvaluesIF::RETURN_OK;
}
MessageQueueId_t MessageQueue::getId() const {
return this->id;
}
void MessageQueue::setDefaultDestination(MessageQueueId_t defaultDestination) {
this->defaultDestination = defaultDestination;
}
ReturnValue_t MessageQueue::sendMessageFrom(MessageQueueId_t sendTo,
MessageQueueMessage* message, MessageQueueId_t sentFrom,
bool ignoreFault) {
message->setSender(sentFrom);
int result = mq_send(sendTo,
reinterpret_cast<const char*>(message->getBuffer()), message->messageSize,0);
//TODO: Check if we're in ISR.
if (result != 0 && !ignoreFault) {
if (internalErrorReporter == NULL) {
internalErrorReporter = objectManager->get<InternalErrorReporterIF>(
objects::INTERNAL_ERROR_REPORTER);
}
if (internalErrorReporter != NULL) {
internalErrorReporter->queueMessageNotSent();
}
switch(errno){
case EAGAIN:
//The O_NONBLOCK flag was set when opening the queue, or the MQ_NONBLOCK flag was set in its attributes, and the specified queue is full.
return MessageQueueIF::FULL;
case EBADF:
//mq_des doesn't represent a valid message queue descriptor, or mq_des wasn't opened for writing.
error << "MessageQueue::sendMessage: Configuration error " << strerror(errno) << " in mq_send mqSendTo: " << sendTo << " sent from " << sentFrom << std::endl;
/*NO BREAK*/
case EINTR:
//The call was interrupted by a signal.
case EINVAL:
/*
* This value indicates one of the following:
* * msg_ptr is NULL.
* * msg_len is negative.
* * msg_prio is greater than MQ_PRIO_MAX.
* * msg_prio is less than 0.
* * MQ_PRIO_RESTRICT is set in the mq_attr of mq_des, and msg_prio is greater than the priority of the calling process.
* */
error << "MessageQueue::sendMessage: Configuration error " << strerror(errno) << " in mq_send" << std::endl;
/*NO BREAK*/
case EMSGSIZE:
//The msg_len is greater than the msgsize associated with the specified queue.
default:
return HasReturnvaluesIF::RETURN_FAILED;
}
}
return HasReturnvaluesIF::RETURN_OK;
}
ReturnValue_t MessageQueue::sendToDefaultFrom(MessageQueueMessage* message,
MessageQueueId_t sentFrom, bool ignoreFault) {
return sendMessageFrom(defaultDestination, message, sentFrom, ignoreFault);
}
MessageQueueId_t MessageQueue::getDefaultDestination() const {
return this->defaultDestination;
}
bool MessageQueue::isDefaultDestinationSet() const {
return (defaultDestination != NO_QUEUE);
}
uint16_t MessageQueue::queueCounter = 0;