From 799c767d319d65c94b3770e82490c8dd4dc80378 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Tue, 2 Nov 1999 18:00:15 +0000
Subject: Split the POSIX semaphore manager into multiple files.

---
 cpukit/posix/src/semopen.c | 109 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 cpukit/posix/src/semopen.c

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

diff --git a/cpukit/posix/src/semopen.c b/cpukit/posix/src/semopen.c
new file mode 100644
index 0000000000..c0ac7ffe3b
--- /dev/null
+++ b/cpukit/posix/src/semopen.c
@@ -0,0 +1,109 @@
+/*
+ *  $Id$
+ */
+
+#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/posix/seterr.h>
+
+/*PAGE
+ *
+ *  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;
+  Objects_Id                 the_semaphore_id;
+  POSIX_Semaphore_Control   *the_semaphore;
+  Objects_Locations          location;
+ 
+
+  if ( oflag & O_CREAT ) {
+    va_start(arg, oflag);
+    /*mode = (mode_t) va_arg( arg, mode_t * );*/
+    mode = va_arg( arg, mode_t );
+    /*value = (unsigned int) 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 ) {
+
+    if ( status == EINVAL ) {      /* name -> ID translation failed */
+      if ( !(oflag & O_CREAT) ) {  /* willing to create it? */
+        set_errno_and_return_minus_one_cast( ENOENT, sem_t * );
+      }
+      /* we are willing to create it */
+    }
+    /* some type of error */
+    /*set_errno_and_return_minus_one_cast( status, sem_t * );*/
+
+  } else {                /* name -> ID translation succeeded */
+
+    if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) {
+      set_errno_and_return_minus_one_cast( EEXIST, sem_t * );
+    }
+
+    /* 
+     * 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_semaphore = _POSIX_Semaphore_Get( &the_semaphore_id, &location );
+    the_semaphore->open_count += 1;
+
+    return (sem_t *)&the_semaphore->Object.id;
+
+  } 
+  
+  /* XXX verify this comment...
+   *
+   *  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
+  );
+ 
+  if ( status == -1 )
+    return (sem_t *) -1;
+
+  return (sem_t *) &the_semaphore->Object.id;
+ 
+}
-- 
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