OSX/libsecurityd/lib/SharedMemoryCommon.h

   1 /*
   2  * Copyright (c) 2011,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef __SHARED_MEMORY_COMMON__
  25 #define __SHARED_MEMORY_COMMON__
  26
  27
  28
  29 #include <sys/types.h>
  30
  31 const unsigned kSegmentSize = 4096;
  32 const unsigned kNumberOfSegments = 8;
  33 const unsigned kSharedMemoryPoolSize = kSegmentSize * kNumberOfSegments;
  34
  35 const unsigned kBytesWrittenOffset = 0;
  36 const unsigned kBytesWrittenLength = 4;
  37 const unsigned kPoolAvailableForData = kSharedMemoryPoolSize - kBytesWrittenLength;
  38
  39 typedef u_int32_t SegmentOffsetType;
  40
  41 class SharedMemoryCommon
  42 {
  43 public:
  44     SharedMemoryCommon() {}
  45     virtual ~SharedMemoryCommon ();
  46
  47     // Is this a system user or a regular user?
  48     static uid_t fixUID(uid_t uid) { return (uid < 500) ? 0 : uid; }
  49
  50     static std::string SharedMemoryFilePath(const char *segmentName, uid_t uid);
  51     static std::string notificationDescription(int domain, int event);
  52
  53     constexpr static const char* const kMDSDirectory = "/private/var/db/mds/";
  54     constexpr static const char* const kMDSMessagesDirectory = "/private/var/db/mds/messages/";
  55     constexpr static const char* const kUserPrefix = "se_";
  56
  57     constexpr static const char* const kDefaultSecurityMessagesName = "SecurityMessages";
  58 };
  59
  60
  61 #endif