diff options
Diffstat (limited to 'cpukit/posix/src/mqueuegetattr.c')
-rw-r--r-- | cpukit/posix/src/mqueuegetattr.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/cpukit/posix/src/mqueuegetattr.c b/cpukit/posix/src/mqueuegetattr.c new file mode 100644 index 0000000000..16a5c50b5f --- /dev/null +++ b/cpukit/posix/src/mqueuegetattr.c @@ -0,0 +1,88 @@ +/* + * 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) 1989-2007. + * 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> + +/*PAGE + * + * 15.2.8 Get Message Queue Attributes, P1003.1b-1993, p. 283 + */ + +int mq_getattr( + mqd_t mqdes, + struct mq_attr *mqstat +) +{ + POSIX_Message_queue_Control *the_mq; + POSIX_Message_queue_Control_fd *the_mq_fd; + Objects_Locations location; + CORE_message_queue_Attributes *the_mq_attr; + + if ( !mqstat ) + rtems_set_errno_and_return_minus_one( EINVAL ); + + the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location ); + switch ( location ) { + + case OBJECTS_LOCAL: + the_mq = the_mq_fd->Queue; + + /* + * Return the old values. + */ + + the_mq_attr = &the_mq->Message_queue.Attributes; + + mqstat->mq_flags = the_mq_fd->oflag; + mqstat->mq_msgsize = the_mq->Message_queue.maximum_message_size; + mqstat->mq_maxmsg = the_mq->Message_queue.maximum_pending_messages; + mqstat->mq_curmsgs = the_mq->Message_queue.number_of_pending_messages; + + _Thread_Enable_dispatch(); + return 0; + +#if defined(RTEMS_MULTIPROCESSING) + case OBJECTS_REMOTE: +#endif + case OBJECTS_ERROR: + break; + } + + rtems_set_errno_and_return_minus_one( EBADF ); +} |