Add advisory locking to CCAPI

Added code to trash client crashes.  Reorganized server launch to make
it easier to implement platform specific code.

ticket: new
status: open

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@19573 dc483132-0cff-0310-8789-dd5450dbe970

1 files changed, 121 insertions, 0 deletions

diff --git a/src/ccapi/server/ccs_lockref.c b/src/ccapi/server/ccs_lockref.c
new file mode 100644
index 0000000000..78f80ae5d1
--- /dev/null
+++ b/src/ccapi/server/ccs_lockref.c
@@ -0,0 +1,121 @@
+/*
+ * $Header$
+ *
+ * Copyright 2006 Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ * require a specific license from the United States Government.
+ * It is the responsibility of any person or organization contemplating
+ * export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ */
+
+#include "ccs_common.h"
+
+struct ccs_lockref_d {
+    ccs_client_t client_owner;
+    ccs_lock_t lock;
+};
+
+struct ccs_lockref_d ccs_lockref_initializer = { NULL, NULL };
+
+/* ------------------------------------------------------------------------ */
+
+cc_int32 ccs_lockref_new (ccs_lockref_t *out_lockref,
+                          ccs_client_t   in_client_owner,
+                          ccs_lock_t     in_lock)
+{
+    cc_int32 err = ccNoError;
+    ccs_lockref_t lockref = NULL;
+    
+    if (!out_lockref    ) { err = cci_check_error (ccErrBadParam); }
+    if (!in_client_owner) { err = cci_check_error (ccErrBadParam); }
+    if (!in_lock        ) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err) {
+        lockref = malloc (sizeof (*lockref));
+        if (lockref) { 
+            *lockref = ccs_lockref_initializer;
+        } else {
+            err = cci_check_error (ccErrNoMem); 
+        }
+    }
+    
+    if (!err) {
+        lockref->client_owner = in_client_owner;
+        lockref->lock = in_lock;
+        
+        *out_lockref = lockref;
+        lockref = NULL;
+    }
+    
+    ccs_lockref_release (lockref);
+    
+    return cci_check_error (err);    
+}
+
+/* ------------------------------------------------------------------------ */
+
+cc_int32 ccs_lockref_release (ccs_lockref_t io_lockref)
+{
+    cc_int32 err = ccNoError;
+    
+    if (!io_lockref) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err) {
+        if (io_lockref->lock) {
+            ccs_lock_invalidate (io_lockref->lock);
+        }
+        free (io_lockref);
+    }
+    
+    return cci_check_error (err);    
+}
+
+/* ------------------------------------------------------------------------ */
+
+cc_int32 ccs_lockref_invalidate (ccs_lockref_t io_lockref)
+{
+    cc_int32 err = ccNoError;
+    
+    if (!io_lockref) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err) {
+        io_lockref->lock = NULL; /* so we don't loop */
+    }
+    
+    return cci_check_error (err);    
+}
+
+/* ------------------------------------------------------------------------ */
+
+cc_int32 ccs_lockref_is_for_lock (ccs_lockref_t in_lockref,
+                                  ccs_lock_t    in_lock,
+                                  cc_uint32    *out_is_for_lock)
+{
+    cc_int32 err = ccNoError;
+    
+    if (!in_lockref     ) { err = cci_check_error (ccErrBadParam); }
+    if (!in_lock        ) { err = cci_check_error (ccErrBadParam); }
+    if (!out_is_for_lock) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err) {
+        *out_is_for_lock = (in_lockref->lock == in_lock);
+    }
+    
+    return cci_check_error (err);    
+}