The following code is taken from the ipc/msg.c file of the Linux Kernel 4.19.225. Check all the true claims that follow.
/**
* newque - Create a new msg queue
* @ns: namespace
* @params: ptr to the structure that contains the key and msgflg
*
* Called with msg_ids.rwsem held (writer)
*/
static int newque(struct ipc_namespace *ns, struct ipc_params *params)
{
        struct msg_queue *msq;
        int retval;
        key_t key = params->key;
        int msgflg = params->flg;
        msq = kvmalloc(sizeof(*msq), GFP_KERNEL);
        if (unlikely(!msq))
                return -ENOMEM;
        msq->q_perm.mode = msgflg & S_IRWXUGO;
        msq->q_perm.key = key;
        msq->q_perm.security = NULL;
        retval = security_msg_queue_alloc(&msq->q_perm);
        if (retval) {
                kvfree(msq);
                return retval;
        }
        msq->q_stime = msq->q_rtime = 0;
        msq->q_ctime = ktime_get_real_seconds();
        msq->q_cbytes = msq->q_qnum = 0;
        msq->q_qbytes = ns->msg_ctlmnb;
        msq->q_lspid = msq->q_lrpid = NULL;
        INIT_LIST_HEAD(&msq->q_messages);
        INIT_LIST_HEAD(&msq->q_receivers);
        INIT_LIST_HEAD(&msq->q_senders);
        /* ipc_addid() locks msq upon success. */
        retval = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
        if (retval < 0) {
                ipc_rcu_putref(&msq->q_perm, msg_rcu_free);
                return retval;
        }
        ipc_unlock_object(&msq->q_perm);
        rcu_read_unlock();
        return msq->q_perm.id;
}

Question

The following code is taken from the ipc/msg.c file of the Linux Kernel 4.19.225. Check all the true claims that follow. 
 /** 
  * newque - Create a new msg queue 
  * @ns: namespace 
  * @params: ptr to the structure that contains the key and msgflg 
  * 
  * Called with msg_ids.rwsem held (writer) 
  */ 
 static int newque(struct ipc_namespace *ns, struct ipc_params *params) 
 { 
         struct msg_queue *msq; 
         int retval; 
         key_t key = params->key; 
         int msgflg = params->flg; 
 
         msq = kvmalloc(sizeof(*msq), GFP_KERNEL); 
         if (unlikely(!msq)) 
                 return -ENOMEM; 
 
         msq->q_perm.mode = msgflg & S_IRWXUGO; 
         msq->q_perm.key = key; 
 
         msq->q_perm.security = NULL; 
         retval = security_msg_queue_alloc(&msq->q_perm); 
         if (retval) { 
                 kvfree(msq); 
                 return retval; 
         } 
 
         msq->q_stime = msq->q_rtime = 0; 
         msq->q_ctime = ktime_get_real_seconds(); 
         msq->q_cbytes = msq->q_qnum = 0; 
         msq->q_qbytes = ns->msg_ctlmnb; 
         msq->q_lspid = msq->q_lrpid = NULL; 
         INIT_LIST_HEAD(&msq->q_messages); 
         INIT_LIST_HEAD(&msq->q_receivers); 
         INIT_LIST_HEAD(&msq->q_senders); 
 
         /* ipc_addid() locks msq upon success. */ 
         retval = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni); 
         if (retval < 0) { 
                 ipc_rcu_putref(&msq->q_perm, msg_rcu_free); 
                 return retval; 
         } 
 
         ipc_unlock_object(&msq->q_perm); 
         rcu_read_unlock(); 
 
         return msq->q_perm.id; 
 }

Accepted Answer

The created object can handle receivers

Accepted Answer

The function allocates a new structure but has to disallocate it in case of error

Answer

This function returns an error if no "id" is available

Answer

The function creates a new message

Answer

The function  returns a pointer to a message queue

Crowdly

The following code is taken from the ipc/msg.c file of the Linux Kernel 4.19.22...

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