diff options
Diffstat (limited to 'cpukit/posix/src/mqueuecreatesupp.c')
| -rw-r--r-- | cpukit/posix/src/mqueuecreatesupp.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/cpukit/posix/src/mqueuecreatesupp.c b/cpukit/posix/src/mqueuecreatesupp.c new file mode 100644 index 0000000000..1259701124 --- /dev/null +++ b/cpukit/posix/src/mqueuecreatesupp.c @@ -0,0 +1,173 @@ +/* + * 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. + * + * $Id$ + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#include <string.h> +#include <stdarg.h> +#include <stdlib.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/score/wkspace.h> +#include <rtems/seterr.h> +#include <rtems/posix/mqueue.h> +#include <rtems/posix/time.h> + +/* pure ANSI mode does not have this prototype */ +size_t strnlen(const char *, size_t); + +/*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_arg, + int pshared, + 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; + char *name; + size_t n; + + n = strnlen( name_arg, NAME_MAX ); + if ( n > NAME_MAX ) + return ENAMETOOLONG; + + _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(); + rtems_set_errno_and_return_minus_one( EINVAL ); + } + + if ( attr_ptr->mq_msgsize <= 0 ){ + _Thread_Enable_dispatch(); + rtems_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(); + rtems_set_errno_and_return_minus_one( ENFILE ); + } +#endif + + the_mq = _POSIX_Message_queue_Allocate(); + if ( !the_mq ) { + _Thread_Enable_dispatch(); + rtems_set_errno_and_return_minus_one( ENFILE ); + } + + the_mq->process_shared = pshared; + the_mq->named = TRUE; + the_mq->open_count = 1; + the_mq->linked = TRUE; + + /* + * Make a copy of the user's string for name just in case it was + * dynamically constructed. + */ + + name = _Workspace_Allocate(n); + if (!name) { + _POSIX_Message_queue_Free( the_mq ); + _Thread_Enable_dispatch(); + rtems_set_errno_and_return_minus_one( ENOMEM ); + } + strcpy( name, name_arg ); + + /* 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, + the_mq_attr, + attr.mq_maxmsg, + attr.mq_msgsize + ) ) { + +#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 ); + _Workspace_Free(name); + _Thread_Enable_dispatch(); + rtems_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, + 0 /* Not used */ + ); +#endif + + _Thread_Enable_dispatch(); + return 0; +} |