libsecurityd/lib/SharedMemoryClient.h

   1 #ifndef __SHAREDMEMORYCLIENT__
   2 #define __SHAREDMEMORYCLIENT__
   3
   4
   5
   6 #include <string>
   7 #include <stdlib.h>
   8 #include <securityd_client/SharedMemoryCommon.h>
   9 #include <security_utilities/threading.h>
  10
  11 namespace Security
  12 {
  13
  14 enum UnavailableReason {kURNone, kURMessageDropped, kURMessagePending, kURNoMessage, kURBufferCorrupt};
  15
  16 class SharedMemoryClient
  17 {
  18 protected:
  19         std::string mSegmentName;
  20         size_t mSegmentSize;
  21         Mutex mMutex;
  22
  23         u_int8_t* mSegment;
  24         u_int8_t* mDataArea;
  25         u_int8_t* mDataPtr;
  26         u_int8_t* mDataMax;
  27
  28         SegmentOffsetType GetProducerCount ();
  29
  30         void ReadData (void* buffer, SegmentOffsetType bytesToRead);
  31         SegmentOffsetType ReadOffset ();
  32
  33 public:
  34         SharedMemoryClient (const char* segmentName, SegmentOffsetType segmentSize);
  35         virtual ~SharedMemoryClient ();
  36
  37         bool ReadMessage (void* message, SegmentOffsetType &length, UnavailableReason &ur);
  38
  39         const char* GetSegmentName ();
  40         size_t GetSegmentSize ();
  41 };
  42
  43 };
  44
  45
  46 #endif