source: rtems/c/src/exec/posix/src/mqueueclose.c @ 53092d1

4.104.114.84.95
Last change on this file since 53092d1 was 53092d1, checked in by Joel Sherrill <joel.sherrill@…>, on 04/26/02 at 23:39:01

2001-04-26 Joel Sherrill <joel@…>

  • include/rtems/posix/mqueue.h, inline/rtems/posix/mqueue.inl, src/mqueue.c, src/mqueueclose.c, src/mqueuecreatesupp.c, src/mqueuegetattr.c, src/mqueuenotify.c, src/mqueueopen.c, src/mqueuerecvsupp.c, src/mqueuesendsupp.c, src/mqueuesetattr.c: Per PR81 reworked to add a message queue descriptor separate from the underlying message queue. This allows non-blocking to follow the "open" not the underlying queue.
  • Property mode set to 100644
File size: 2.1 KB
Line 
1/*
2 *  NOTE:  The structure of the routines is identical to that of POSIX
3 *         Message_queues to leave the option of having unnamed message
4 *         queues at a future date.  They are currently not part of the
5 *         POSIX standard but unnamed message_queues are.  This is also
6 *         the reason for the apparently unnecessary tracking of
7 *         the process_shared attribute.  [In addition to the fact that
8 *         it would be trivial to add pshared to the mq_attr structure
9 *         and have process private message queues.]
10 *
11 *         This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open
12 *         time.
13 *
14 *  $Id$
15 */
16
17#if HAVE_CONFIG_H
18#include "config.h"
19#endif
20
21#include <stdarg.h>
22
23#include <pthread.h>
24#include <limits.h>
25#include <errno.h>
26#include <fcntl.h>
27#include <mqueue.h>
28
29#include <rtems/system.h>
30#include <rtems/score/watchdog.h>
31#include <rtems/seterr.h>
32#include <rtems/posix/mqueue.h>
33#include <rtems/posix/time.h>
34
35/*
36 *
37 *  15.2.2 Close a Message Queue, P1003.1b-1993, p. 275
38 */
39
40int mq_close(
41  mqd_t  mqdes
42)
43{
44  POSIX_Message_queue_Control    *the_mq;
45  POSIX_Message_queue_Control_fd *the_mq_fd;
46  Objects_Locations               location;
47 
48  the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location );
49  switch ( location ) {
50    case OBJECTS_ERROR:
51      rtems_set_errno_and_return_minus_one( EBADF );
52    case OBJECTS_REMOTE:
53      _Thread_Dispatch();
54      return POSIX_MP_NOT_IMPLEMENTED();
55      rtems_set_errno_and_return_minus_one( EINVAL );
56    case OBJECTS_LOCAL:
57      /*
58       *  First update the actual message queue to reflect this descriptor
59       *  being disassociated.  This may result in the queue being really
60       *  deleted.
61       */
62
63      the_mq = the_mq_fd->Queue;
64      the_mq->open_count -= 1;
65      _POSIX_Message_queue_Delete( the_mq );
66
67      /*
68       *  Now close this file descriptor.
69       */
70
71      _Objects_Close(
72        &_POSIX_Message_queue_Information_fds, &the_mq_fd->Object );
73      _POSIX_Message_queue_Free_fd( the_mq_fd );
74
75      _Thread_Enable_dispatch();
76      return 0;
77  }
78  return POSIX_BOTTOM_REACHED();
79}
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