[GitHub] [incubator-nuttx] anchao commented on a diff in pull request #7088: sched/msgq: add support of System V message queue

[GitBox <gi...@apache.org>]

anchao commented on code in PR #7088:
URL: https://github.com/apache/incubator-nuttx/pull/7088#discussion_r997208581


##########
include/nuttx/mqueue.h:
##########
@@ -83,16 +83,23 @@
  * Public Type Declarations
  ****************************************************************************/
 
+/* Common prologue of all message queue structures. */
+
+struct mqueue_comm_s

Review Comment:
   Done



##########
sched/mqueue/msgget.c:
##########
@@ -0,0 +1,95 @@
+/****************************************************************************
+ * sched/mqueue/msgget.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include "mqueue/msg.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: msgget
+ *
+ * Description:
+ *   Get a System V message queue identifier
+ *   The msgget() system call returns the System V message queue
+ *   identifier associated with the value of the key argument.  It may
+ *   be used either to obtain the identifier of a previously created
+ *   message queue (when msgflg is zero and key does not have the
+ *   value IPC_PRIVATE), or to create a new set.
+ *
+ * Input Parameters:
+ *   key    - Key associated with the message queue
+ *   msgflg - Operations and permissions flag
+ *
+ * Returned Value:
+ *   On success, msgget() returns the message queue identifier (a
+ *   nonnegative integer).  On failure, -1 is returned, and errno is
+ *   set to indicate the error.
+ *
+ ****************************************************************************/
+
+int msgget(key_t key, int msgflg)
+{
+  FAR struct msgq_s *msgq;
+  irqstate_t flags;
+  int ret = OK;
+
+  flags = enter_critical_section();
+
+  msgq = nxmsg_lookup(key);
+
+  if (msgq)
+    {
+      if ((msgflg & IPC_CREAT) && (msgflg & IPC_EXCL))
+        {
+          ret = -EEXIST;
+        }
+    }
+  else
+    {
+      if (key != IPC_PRIVATE && !(msgflg & IPC_CREAT))

Review Comment:
   Done



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