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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [posix/] [src/] [mqueuesetattr.c] - Blame information for rev 173

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1 30 unneback
/*
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 *  NOTE:  The structure of the routines is identical to that of POSIX
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 *         Message_queues to leave the option of having unnamed message
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 *         queues at a future date.  They are currently not part of the
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 *         POSIX standard but unnamed message_queues are.  This is also
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 *         the reason for the apparently unnecessary tracking of
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 *         the process_shared attribute.  [In addition to the fact that
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 *         it would be trivial to add pshared to the mq_attr structure
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 *         and have process private message queues.]
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 *
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 *         This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open
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 *         time.
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 *
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 *  $Id: mqueuesetattr.c,v 1.2 2001-09-27 11:59:17 chris Exp $
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 */
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#include <stdarg.h>
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#include <pthread.h>
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#include <limits.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <mqueue.h>
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#include <rtems/system.h>
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#include <rtems/score/watchdog.h>
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#include <rtems/posix/seterr.h>
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#include <rtems/posix/mqueue.h>
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#include <rtems/posix/time.h>
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/*PAGE
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 *
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 *  15.2.7 Set Message Queue Attributes, P1003.1b-1993, p. 281
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 */
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int mq_setattr(
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  mqd_t                 mqdes,
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  const struct mq_attr *mqstat,
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  struct mq_attr       *omqstat
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)
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{
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  register POSIX_Message_queue_Control *the_mq;
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  CORE_message_queue_Control           *the_core_mq;
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  Objects_Locations                     location;
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  CORE_message_queue_Attributes        *the_mq_attr;
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  if ( !mqstat )
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    set_errno_and_return_minus_one( EINVAL );
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  the_mq = _POSIX_Message_queue_Get( mqdes, &location );
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  switch ( location ) {
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    case OBJECTS_ERROR:
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      set_errno_and_return_minus_one( EBADF );
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    case OBJECTS_REMOTE:
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      _Thread_Dispatch();
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      return POSIX_MP_NOT_IMPLEMENTED();
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      set_errno_and_return_minus_one( EINVAL );
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    case OBJECTS_LOCAL:
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      the_core_mq = &the_mq->Message_queue;
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      /*
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       *  Return the old values.
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       */
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      /* XXX this is the same stuff as is in mq_getattr... and probably */
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      /* XXX should be in an inlined private routine */
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      if ( omqstat ) {
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        omqstat->mq_flags   = the_mq->oflag;
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        omqstat->mq_msgsize = the_core_mq->maximum_message_size;
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        omqstat->mq_maxmsg  = the_core_mq->maximum_pending_messages;
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        omqstat->mq_curmsgs = the_core_mq->number_of_pending_messages;
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      }
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      /*
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       *  If blocking was in effect and is not now, then there
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       *  may be threads blocked on this message queue which need
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       *  to be unblocked to make the state of the message queue
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       *  consistent for future use.
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       */
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      the_mq_attr = &the_core_mq->Attributes;
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      if ( !(the_mq->oflag & O_NONBLOCK) &&         /* were blocking */
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           (mqstat->mq_flags & O_NONBLOCK) ) {      /* and now are not */
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        _CORE_message_queue_Flush_waiting_threads( the_core_mq );
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      }
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      the_mq->oflag = mqstat->mq_flags;
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      _Thread_Enable_dispatch();
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      return 0;
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  }
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  return POSIX_BOTTOM_REACHED();
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}
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