From 4dc89814e10296b8f7212e949a97730abc9032e4 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Tue, 2 Nov 1999 17:00:35 +0000
Subject: Split mqueue.c into a variety of files.

---
 cpukit/posix/src/mqueueopen.c | 116 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 cpukit/posix/src/mqueueopen.c

(limited to 'cpukit/posix/src/mqueueopen.c')

diff --git a/cpukit/posix/src/mqueueopen.c b/cpukit/posix/src/mqueueopen.c
new file mode 100644
index 0000000000..4ea5a63b78
--- /dev/null
+++ b/cpukit/posix/src/mqueueopen.c
@@ -0,0 +1,116 @@
+/*
+ *  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
+ *
+ *  15.2.2 Open a Message Queue, P1003.1b-1993, p. 272
+ */
+
+mqd_t mq_open(
+  const char *name,
+  int         oflag,
+  ...
+  /* mode_t mode, */
+  /* struct mq_attr  attr */
+)
+{
+  va_list                        arg;
+  mode_t                         mode;
+  struct mq_attr                *attr;
+  int                            status;
+  Objects_Id                     the_mq_id;
+  POSIX_Message_queue_Control   *the_mq;
+ 
+  if ( oflag & O_CREAT ) {
+    va_start(arg, oflag);
+    mode = (mode_t) va_arg( arg, mode_t );
+    attr = (struct mq_attr *) va_arg( arg, struct mq_attr * );
+    va_end(arg);
+  }
+ 
+  status = _POSIX_Message_queue_Name_to_id( name, &the_mq_id );
+ 
+  /*
+   *  If the name to id translation worked, then the message queue exists
+   *  and we can just return a pointer to the id.  Otherwise we may
+   *  need to check to see if this is a "message queue does not exist"
+   *  or some other miscellaneous error on the name.
+   */
+ 
+  if ( status ) {
+ 
+    if ( status == EINVAL ) {      /* name -> ID translation failed */
+      if ( !(oflag & O_CREAT) ) {  /* willing to create it? */
+        set_errno_and_return_minus_one( ENOENT );
+        return (mqd_t) -1;
+      }
+      /* we are willing to create it */
+    }
+    set_errno_and_return_minus_one( status ); /* some type of error */
+    return (mqd_t) -1;
+ 
+  } else {                /* name -> ID translation succeeded */
+ 
+    if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) {
+      set_errno_and_return_minus_one( EEXIST );
+      return (mqd_t) -1;
+    }
+ 
+    /*
+     * XXX In this case we need to do an ID->pointer conversion to
+     *     check the mode.   This is probably a good place for a subroutine.
+     */
+ 
+    the_mq->open_count += 1;
+ 
+    return (mqd_t)&the_mq->Object.id;
+ 
+  }
+ 
+  /* XXX verify this comment...
+   *
+   *  At this point, the message queue does not exist and everything has been
+   *  checked. We should go ahead and create a message queue.
+   */
+ 
+  status = _POSIX_Message_queue_Create_support(
+    name,
+    TRUE,         /* shared across processes */
+    oflag,
+    attr,
+    &the_mq
+  );
+ 
+  if ( status == -1 )
+    return (mqd_t) -1;
+ 
+  return (mqd_t) &the_mq->Object.id;
+}
+
-- 
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