1 files changed, 128 insertions, 0 deletions
diff --git a/cpukit/posix/src/mqueuerecvsupp.c b/cpukit/posix/src/mqueuerecvsupp.c
new file mode 100644
index 0000000000..9c3fb47371
--- /dev/null
+++ b/cpukit/posix/src/mqueuerecvsupp.c
@@ -0,0 +1,128 @@
+/*
+ *  NOTE:  The structure of the routines is identical to that of POSIX
+ *         Message_queues to leave the option of having unnamed message
+ *         queues at a future date.  They are currently not part of the
+ *         POSIX standard but unnamed message_queues are.  This is also
+ *         the reason for the apparently unnecessary tracking of
+ *         the process_shared attribute.  [In addition to the fact that
+ *         it would be trivial to add pshared to the mq_attr structure
+ *         and have process private message queues.]
+ *
+ *         This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open
+ *         time.
+ *
+ *  COPYRIGHT (c) 1989-2008.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdarg.h>
+
+#include <pthread.h>
+#include <limits.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <mqueue.h>
+
+#include <rtems/system.h>
+#include <rtems/score/watchdog.h>
+#include <rtems/seterr.h>
+#include <rtems/posix/mqueue.h>
+#include <rtems/posix/time.h>
+
+/*
+ *  _POSIX_Message_queue_Receive_support
+ *
+ *  NOTE: XXX Document how size, priority, length, and the buffer go
+ *        through the layers.
+ */
+
+ssize_t _POSIX_Message_queue_Receive_support(
+  mqd_t               mqdes,
+  char               *msg_ptr,
+  size_t              msg_len,
+  unsigned int       *msg_prio,
+  bool                wait,
+  Watchdog_Interval   timeout
+)
+{
+  POSIX_Message_queue_Control     *the_mq;
+  POSIX_Message_queue_Control_fd  *the_mq_fd;
+  Objects_Locations                location;
+  size_t                           length_out;
+  bool                             do_wait;
+
+  the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location );
+  switch ( location ) {
+
+    case OBJECTS_LOCAL:
+      if ( (the_mq_fd->oflag & O_ACCMODE) == O_WRONLY ) {
+        _Thread_Enable_dispatch();
+        rtems_set_errno_and_return_minus_one( EBADF );
+      }
+
+      the_mq = the_mq_fd->Queue;
+
+      if ( msg_len < the_mq->Message_queue.maximum_message_size ) {
+        _Thread_Enable_dispatch();
+        rtems_set_errno_and_return_minus_one( EMSGSIZE );
+      }
+
+      /*
+       *  Now if something goes wrong, we return a "length" of -1
+       *  to indicate an error.
+       */
+
+      length_out = -1;
+
+      /*
+       *  A timed receive with a bad time will do a poll regardless.
+       */
+      if ( wait )
+        do_wait = (the_mq_fd->oflag & O_NONBLOCK) ? false : true;
+      else
+        do_wait = wait;
+
+      /*
+       *  Now perform the actual message receive
+       */
+      _CORE_message_queue_Seize(
+        &the_mq->Message_queue,
+        mqdes,
+        msg_ptr,
+        &length_out,
+        do_wait,
+        timeout
+      );
+
+      _Thread_Enable_dispatch();
+      *msg_prio =
+        _POSIX_Message_queue_Priority_from_core(_Thread_Executing->Wait.count);
+
+      if ( !_Thread_Executing->Wait.return_code )
+        return length_out;
+
+      rtems_set_errno_and_return_minus_one(
+        _POSIX_Message_queue_Translate_core_message_queue_return_code(
+          _Thread_Executing->Wait.return_code
+        )
+      );
+
+#if defined(RTEMS_MULTIPROCESSING)
+    case OBJECTS_REMOTE:
+#endif
+    case OBJECTS_ERROR:
+      break;
+  }
+
+  rtems_set_errno_and_return_minus_one( EBADF );
+}