Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_utilities / lib / globalizer.cpp

diff --git a/Security/libsecurity_utilities/lib/globalizer.cpp b/Security/libsecurity_utilities/lib/globalizer.cpp
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+/*
+ * Copyright (c) 2000-2004,2011-2012,2014 Apple Inc. All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+//
+// globalizer - multiscope globalization services.
+//
+// This is a tentative, partial implementation.
+// Status:
+//     module scope: constructs, optional cleanup
+//     thread scope: constructs, optional cleanup
+//     process scope: not implemented (obsolete implementation, unused)
+//     system scope: not implemented (probably never will)
+//
+// @@@ Assumption: {bool,T*} atomic unless PTHREAD_STRICT
+//
+#include <security_utilities/globalizer.h>
+#include <security_utilities/debugging.h>
+#include <cstdlib>
+#include <stdexcept>
+
+//
+// The Error class thrown if Nexus operations fail
+//
+GlobalNexus::Error::~Error() throw()
+{
+}
+
+void ModuleNexusCommon::do_create(void *(*make)())
+{
+    try
+    {
+        pointer = make();
+    }
+    catch (...)
+    {
+        pointer = NULL;
+    }
+}
+
+
+
+void *ModuleNexusCommon::create(void *(*make)())
+{
+    dispatch_once(&once, ^{do_create(make);});
+    
+    if (pointer == NULL)
+    {
+        ModuleNexusError::throwMe();
+    }
+    
+    return pointer;
+}
+
+
+//
+// Process nexus operation
+//
+ProcessNexusBase::ProcessNexusBase(const char *identifier)
+{
+       const char *env = getenv(identifier);
+       if (env == NULL) {      // perhaps we're first...
+               auto_ptr<Store> store(new Store);
+               char form[2*sizeof(Store *) + 2];
+               sprintf(form, "*%p", &store);
+               setenv(identifier, form, 0);    // do NOT overwrite...
+               env = getenv(identifier);               // ... and refetch to resolve races
+               if (sscanf(env, "*%p", &mStore) != 1)
+                       throw std::runtime_error("environment communication failed");
+               if (mStore == store.get())              // we won the race...
+                       store.release();                        // ... so keep the store
+       } else
+               if (sscanf(env, "*%p", &mStore) != 1)
+                       throw std::runtime_error("environment communication failed");
+}