1 files changed, 136 insertions, 0 deletions
diff --git a/cpukit/posix/src/semopen.c b/cpukit/posix/src/semopen.c
new file mode 100644
index 0000000000..b51d2043be
--- /dev/null
+++ b/cpukit/posix/src/semopen.c
@@ -0,0 +1,136 @@
+/*
+ *  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 <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <limits.h>
+
+#include <rtems/system.h>
+#include <rtems/score/object.h>
+#include <rtems/posix/semaphore.h>
+#include <rtems/posix/time.h>
+#include <rtems/seterr.h>
+
+/*PAGE
+ *
+ *  sem_open
+ *
+ *  Opens a named semaphore.  Used in conjunction with the sem_close
+ *  and sem_unlink commands.
+ *
+ *  11.2.3 Initialize/Open a Named Semaphore, P1003.1b-1993, p.221
+ *
+ *  NOTE: When oflag is O_CREAT, then optional third and fourth
+ *        parameters must be present.
+ */
+
+sem_t *sem_open(
+  const char *name,
+  int         oflag,
+  ...
+  /* mode_t mode, */
+  /* unsigned int value */
+)
+{
+  va_list                    arg;
+  mode_t                     mode;
+  unsigned int               value = 0;
+  int                        status;
+  sem_t                      the_semaphore_id;
+  sem_t                     *id;
+  POSIX_Semaphore_Control   *the_semaphore;
+  Objects_Locations          location;
+
+  _Thread_Disable_dispatch();
+
+  if ( oflag & O_CREAT ) {
+    va_start(arg, oflag);
+    mode = (mode_t) va_arg( arg, unsigned int );
+    value = va_arg( arg, unsigned int );
+    va_end(arg);
+  }
+
+  status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id );
+
+  /*
+   *  If the name to id translation worked, then the semaphore exists
+   *  and we can just return a pointer to the id.  Otherwise we may
+   *  need to check to see if this is a "semaphore does not exist"
+   *  or some other miscellaneous error on the name.
+   */
+
+  if ( status ) {
+
+    /*
+     * Unless provided a valid name that did not already exist
+     * and we are willing to create then it is an error.
+     */
+
+    if ( !( status == ENOENT && (oflag & O_CREAT) ) ) {
+      _Thread_Enable_dispatch();
+      rtems_set_errno_and_return_minus_one_cast( status, sem_t * );
+    }
+  } else {
+
+    /*
+     * Check for existence with creation.
+     */
+
+    if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) {
+      _Thread_Enable_dispatch();
+      rtems_set_errno_and_return_minus_one_cast( EEXIST, sem_t * );
+    }
+
+    the_semaphore = _POSIX_Semaphore_Get( &the_semaphore_id, &location );
+    the_semaphore->open_count += 1;
+    _Thread_Enable_dispatch();
+    _Thread_Enable_dispatch();
+    goto return_id;
+  }
+
+  /*
+   *  At this point, the semaphore does not exist and everything has been
+   *  checked. We should go ahead and create a semaphore.
+   */
+
+  status =_POSIX_Semaphore_Create_support(
+    name,
+    false,         /* not shared across processes */
+    value,
+    &the_semaphore
+  );
+
+  /*
+   * errno was set by Create_support, so don't set it again.
+   */
+
+  _Thread_Enable_dispatch();
+
+  if ( status == -1 )
+    return SEM_FAILED;
+
+return_id:
+  #if defined(RTEMS_USE_16_BIT_OBJECT)
+    the_semaphore->Semaphore_id = the_semaphore->Object.id;
+    id = &the_semaphore->Semaphore_id;
+  #else
+    id = (sem_t *)&the_semaphore->Object.id;
+  #endif
+  return id;
+}