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/*

 *  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.

 *

 *  $Id: mqueuecreatesupp.c,v 1.2 2001-09-27 11:59:17 chris Exp $

 */

#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/posix/seterr.h>

#include <rtems/posix/mqueue.h>

#include <rtems/posix/time.h>

/*PAGE

 *

 *  _POSIX_Message_queue_Create_support

 *

 *  This routine does the actual creation and initialization of

 *  a poxix message queue.

 */

int _POSIX_Message_queue_Create_support(

  const char                    *name,

  int                            pshared,

  unsigned int                   oflag,

  struct mq_attr                *attr_ptr,

  POSIX_Message_queue_Control  **message_queue

)

{

  POSIX_Message_queue_Control   *the_mq;

  CORE_message_queue_Attributes *the_mq_attr;

  struct mq_attr                 attr;

  _Thread_Disable_dispatch();

  /*

   *  There is no real basis for the default values.  They will work

   *  but were not compared against any existing implementation for

   *  compatibility.  See README.mqueue for an example program we

   *  think will print out the defaults.  Report anything you find with it.

   */

  if ( attr_ptr == NULL ) {

    attr.mq_maxmsg  = 10;

    attr.mq_msgsize = 16;

  } else {

    if ( attr_ptr->mq_maxmsg < 0 ){

      _Thread_Enable_dispatch();

      set_errno_and_return_minus_one( EINVAL );

    }

    if ( attr_ptr->mq_msgsize < 0 ){

      _Thread_Enable_dispatch();

      set_errno_and_return_minus_one( EINVAL );

    }

    attr = *attr_ptr;

  }

#if 0 && defined(RTEMS_MULTIPROCESSING)

  if ( pshared == PTHREAD_PROCESS_SHARED &&

       !( _Objects_MP_Allocate_and_open( &_POSIX_Message_queue_Information, 0,

                            the_mq->Object.id, FALSE ) ) ) {

    _POSIX_Message_queue_Free( the_mq );

    _Thread_Enable_dispatch();

    set_errno_and_return_minus_one( ENFILE );

  }

#endif

  the_mq = _POSIX_Message_queue_Allocate();

  if ( !the_mq ) {

    _Thread_Enable_dispatch();

    set_errno_and_return_minus_one( ENFILE );

  }

  the_mq->process_shared  = pshared;

  the_mq->oflag = oflag;

  the_mq->named = TRUE;

  the_mq->open_count = 1;

  the_mq->linked = TRUE;

  /* XXX

   *

   *  Note that thread blocking discipline should be based on the

   *  current scheduling policy.

   */

  the_mq_attr = &the_mq->Message_queue.Attributes;

  the_mq_attr->discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO;

  if ( ! _CORE_message_queue_Initialize(

           &the_mq->Message_queue,

           OBJECTS_POSIX_MESSAGE_QUEUES,

           the_mq_attr,

           attr.mq_maxmsg,

           attr.mq_msgsize,

#if 0 && defined(RTEMS_MULTIPROCESSING)

           _POSIX_Message_queue_MP_Send_extract_proxy

#else

           NULL

#endif

      ) ) {

#if 0 && defined(RTEMS_MULTIPROCESSING)

    if ( pshared == PTHREAD_PROCESS_SHARED )

      _Objects_MP_Close( &_POSIX_Message_queue_Information, the_mq->Object.id );

#endif

    _POSIX_Message_queue_Free( the_mq );

    _Thread_Enable_dispatch();

    set_errno_and_return_minus_one( ENOSPC );

  }

  _Objects_Open(

    &_POSIX_Message_queue_Information,

    &the_mq->Object,

    (char *) name

  );

  *message_queue = the_mq;

#if 0 && defined(RTEMS_MULTIPROCESSING)

  if ( pshared == PTHREAD_PROCESS_SHARED )

    _POSIX_Message_queue_MP_Send_process_packet(

      POSIX_MESSAGE_QUEUE_MP_ANNOUNCE_CREATE,

      the_mq->Object.id,

      (char *) name,

    );

#endif

  _Thread_Enable_dispatch();

  return 0;

}