Made callback code generic so that change time callbacks can use it as well

ticket: 4644
status: open

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@19719 dc483132-0cff-0310-8789-dd5450dbe970

1 files changed, 229 insertions, 0 deletions

diff --git a/src/ccapi/server/ccs_callback.c b/src/ccapi/server/ccs_callback.c
new file mode 100644
index 0000000..8035e5a
--- /dev/null
+++ b/src/ccapi/server/ccs_callback.c
@@ -0,0 +1,229 @@
+/*
+ * $Header$
+ *
+ * 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_callback_d {
+    cc_int32 pending;
+    cc_int32 invalid_object_err;
+    ccs_pipe_t client_pipe;
+    ccs_pipe_t reply_pipe;
+    ccs_callback_owner_t owner; /* pointer to owner */
+    ccs_callback_owner_invalidate_t owner_invalidate;
+};
+
+struct ccs_callback_d ccs_callback_initializer = { 1, 1, CCS_PIPE_NULL, CCS_PIPE_NULL, NULL, NULL };
+
+/* ------------------------------------------------------------------------ */
+
+cc_int32 ccs_callback_new (ccs_callback_t                  *out_callback,
+			   cc_int32                         in_invalid_object_err,
+			   ccs_pipe_t                       in_client_pipe,
+			   ccs_pipe_t                       in_reply_pipe,
+			   ccs_callback_owner_t             in_owner,
+			   ccs_callback_owner_invalidate_t  in_owner_invalidate_function)
+{
+    cc_int32 err = ccNoError;
+    ccs_callback_t callback = NULL;
+    ccs_client_t client = NULL;
+    
+    if (!out_callback                   ) { err = cci_check_error (ccErrBadParam); }
+    if (!ccs_pipe_valid (in_client_pipe)) { err = cci_check_error (ccErrBadParam); }
+    if (!ccs_pipe_valid (in_reply_pipe) ) { err = cci_check_error (ccErrBadParam); }
+    if (!in_owner                       ) { err = cci_check_error (ccErrBadParam); }
+    if (!in_owner_invalidate_function   ) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err) {
+        callback = malloc (sizeof (*callback));
+        if (callback) { 
+            *callback = ccs_callback_initializer;
+        } else {
+            err = cci_check_error (ccErrNoMem); 
+        }
+    }
+    
+    if (!err) {
+        err = ccs_server_client_for_pipe (in_client_pipe, &client);
+    }
+    
+    if (!err) {
+	err = ccs_pipe_copy (&callback->client_pipe, in_client_pipe);
+    }
+    
+    if (!err) {
+	err = ccs_pipe_copy (&callback->reply_pipe, in_reply_pipe);
+    }
+    
+    if (!err) {
+        callback->client_pipe = in_client_pipe;
+        callback->reply_pipe = in_reply_pipe;
+        callback->invalid_object_err = in_invalid_object_err;
+        callback->owner = in_owner;
+        callback->owner_invalidate = in_owner_invalidate_function;
+    
+        err = ccs_client_add_callback (client, callback);
+    }
+     
+    if (!err) {
+        *out_callback = callback;
+        callback = NULL;
+    }
+    
+    ccs_callback_release (callback);
+    
+    return cci_check_error (err);    
+}
+
+/* ------------------------------------------------------------------------ */
+
+cc_int32 ccs_callback_release (ccs_callback_t io_callback)
+{
+    cc_int32 err = ccNoError;
+    ccs_client_t client = NULL;
+    
+    if (!io_callback) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err && io_callback->pending) {
+        err = ccs_server_send_reply (io_callback->reply_pipe, 
+                                     io_callback->invalid_object_err, NULL);
+        
+        io_callback->pending = 0;
+    }
+    
+    if (!err) {
+        err = ccs_server_client_for_pipe (io_callback->client_pipe, &client);
+    }
+    
+    if (!err) {
+        err = ccs_client_remove_callback (client, io_callback);
+    }
+    
+    if (!err) {
+	ccs_pipe_release (io_callback->client_pipe);
+	ccs_pipe_release (io_callback->reply_pipe);
+        free (io_callback);
+    }
+    
+    return cci_check_error (err);    
+}
+
+/* ------------------------------------------------------------------------ */
+
+cc_int32 ccs_callback_invalidate (ccs_callback_t io_callback)
+{
+    cc_int32 err = ccNoError;
+    
+    if (!io_callback) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err) {
+        io_callback->pending = 0; /* client is dead, don't try to talk to it */
+        err = io_callback->owner_invalidate (io_callback->owner, io_callback);
+    }
+    
+    return cci_check_error (err);
+}
+
+/* ------------------------------------------------------------------------ */
+
+cc_int32 ccs_callback_reply_to_client (ccs_callback_t io_callback,
+				       cci_stream_t   in_stream)
+{
+    cc_int32 err = ccNoError;
+    
+    if (!io_callback) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err) {
+        if (io_callback->pending) {
+            err = ccs_server_send_reply (io_callback->reply_pipe, err, in_stream);
+            
+            if (err) {
+                cci_debug_printf ("WARNING %s() called on a lock belonging to a dead client!", 
+                                  __FUNCTION__);
+            }
+            
+            io_callback->pending = 0;
+        } else {
+            cci_debug_printf ("WARNING %s() called on non-pending callback!", 
+                              __FUNCTION__);
+        }
+    }
+    
+    return cci_check_error (err);    
+}
+
+/* ------------------------------------------------------------------------ */
+
+cc_uint32 ccs_callback_is_pending (ccs_callback_t  in_callback,
+				   cc_uint32      *out_pending)
+{
+    cc_int32 err = ccNoError;
+    
+    if (!in_callback) { err = cci_check_error (ccErrBadParam); }
+    if (!out_pending) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err) {
+        *out_pending = in_callback->pending;
+    }
+    
+    return cci_check_error (err);    
+}
+
+/* ------------------------------------------------------------------------ */
+
+cc_int32 ccs_callback_is_for_client_pipe (ccs_callback_t  in_callback,
+					  ccs_pipe_t      in_client_pipe,
+					  cc_uint32      *out_is_for_client_pipe)
+{
+    cc_int32 err = ccNoError;
+    
+    if (!in_callback                    ) { err = cci_check_error (ccErrBadParam); }
+    if (!ccs_pipe_valid (in_client_pipe)) { err = cci_check_error (ccErrBadParam); }
+    if (!out_is_for_client_pipe         ) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err) {
+        *out_is_for_client_pipe = (in_callback->client_pipe == in_client_pipe);
+    }
+    
+    return cci_check_error (err);    
+}
+
+
+/* ------------------------------------------------------------------------ */
+
+cc_int32 ccs_callback_client_pipe (ccs_callback_t  in_callback,
+				   ccs_pipe_t     *out_client_pipe)
+{
+    cc_int32 err = ccNoError;
+    
+    if (!in_callback        ) { err = cci_check_error (ccErrBadParam); }
+    if (!out_client_pipe) { err = cci_check_error (ccErrBadParam); }
+    
+    if (!err) {
+        *out_client_pipe = in_callback->client_pipe;
+    }
+    
+    return cci_check_error (err);    
+}