Очередь сообщений. Не могу поставить в очередь

#define B_S 125
#define MESSAGE_QUEUE "/msgQueue"
 
  struct mq_attr *attr = malloc(sizeof(attr));
                attr->mq_flags =0;
                attr->mq_maxmsg = 10;
                attr->mq_msgsize = B_S;
....
 
 mqd_t queue = mq_open(MESSAGE_QUEUE, O_CREAT, S_IRWXU, attr);
 int ppp = mq_send(queue, buffer, B_S,1);

 struct mq_attr *attr = malloc(sizeof(attr));
                attr->mq_flags =0;
                attr->mq_maxmsg = 10;
                attr->mq_msgsize = B_S;
                mqd_t queue = mq_open(MESSAGE_QUEUE, O_CREAT, S_IRWXU|S_IRWXG, attr);
                switch(queue)
                {
                    case EACCES:
                    fprintf(stderr, "The message queue exists and the permissions specified by oflag are denied, or the message queue does not exist and permission to create the message queue is denied.");break;
                    case EEXIST:
                    fprintf(stderr, "O_CREAT and O_EXCL are set and the named message queue already exists.");break;
                    case EINTR:
                    fprintf(stderr, "The mq_open() function was interrupted by a signal.");break;
                    case EINVAL:
                    fprintf(stderr, "The mq_open() function is not supported for the given name.");
                    fprintf(stderr, "O_CREAT was specified in oflag, the value of attr is not NULL, and either mq_maxmsg or mq_msgsize was less than or equal to zero.");break;
                    case EMFILE:
                    fprintf(stderr, "Too many message queue descriptors or file descriptors are currently in use by this process.");break;
                    case ENAMETOOLONG:
                    fprintf(stderr," The length of the name argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.");break;
                    case ENFILE:
                    fprintf(stderr,   "Too many message queues are currently open in the system.");
                    case ENOENT:
                    fprintf(stderr,"O_CREAT is not set and the named message queue does not exist.");break;
                    case     ENOSPC:
                    fprintf(stderr,   " There is insufficient space for the creation of the new message queue.");break;
                    default:
                    fprintf(stderr, " %d  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n",errno);break;
                }