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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.
*
* $Id$
*/
#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
*/
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 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
if ( name ) {
if( strlen(name) > PATH_MAX ) { /* XXX - on non-null terminated name? */
_Thread_Enable_dispatch();
set_errno_and_return_minus_one( ENAMETOOLONG );
}
/*
* XXX Greater than NAME_MAX while POSIX_NO_TRUNC in effect.
* XXX Error description in POSIX book different for mq_open and mq_unlink
* Why???
*/
}
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;
if ( name ) {
the_mq->named = TRUE;
the_mq->open_count = 1;
the_mq->linked = TRUE;
}
else {
the_mq->named = FALSE;
}
if ( oflag & O_NONBLOCK )
the_mq->blocking = FALSE;
else
the_mq->blocking = TRUE;
/* XXX
*
* Note that this should be based on the current scheduling policy.
*/
/* XXX
*
* Message and waiting disciplines are not distinguished.
*/
/*
the_mq_attr->message_discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO;
the_mq_attr->waiting_discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO;
*/
the_mq->Message_queue.Attributes.discipline =
CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO;
the_mq_attr = &the_mq->Message_queue.Attributes;
if ( ! _CORE_message_queue_Initialize(
&the_mq->Message_queue,
OBJECTS_POSIX_MESSAGE_QUEUES,
the_mq_attr,
attr.mq_maxmsg,
attr.mq_msgsize,
#if defined(RTEMS_MULTIPROCESSING)
_POSIX_Message_queue_MP_Send_extract_proxy
#else
NULL
#endif
) ) {
#if 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 );
}
/* XXX - need Names to be a string!!! */
_Objects_Open(
&_POSIX_Message_queue_Information,
&the_mq->Object,
(char *) name
);
*message_queue = the_mq;
#if 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,
0 /* Not used */
);
#endif
_Thread_Enable_dispatch();
return 0;
}
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