src/DiskIO/Mmapped/MmappedFile.h

   1 #ifndef SQUID_MMAPPEDFILE_H
   2 #define SQUID_MMAPPEDFILE_H
   3
   4 #include "cbdata.h"
   5 #include "DiskIO/DiskFile.h"
   6 #include "DiskIO/IORequestor.h"
   7
   8 class MmappedFile : public DiskFile
   9 {
  10
  11 public:
  12     void *operator new(size_t);
  13     void operator delete(void *);
  14     MmappedFile(char const *path);
  15     ~MmappedFile();
  16     virtual void open(int flags, mode_t mode, RefCount<IORequestor> callback);
  17     virtual void create(int flags, mode_t mode, RefCount<IORequestor> callback);
  18     virtual void read(ReadRequest *);
  19     virtual void write(WriteRequest *);
  20     virtual void close();
  21     virtual bool error() const;
  22     virtual int getFD() const { return fd;}
  23
  24     virtual bool canRead() const;
  25     virtual bool canWrite() const;
  26     virtual bool ioInProgress() const;
  27
  28 private:
  29     CBDATA_CLASS(MmappedFile);
  30
  31     char const *path_;
  32     RefCount<IORequestor> ioRequestor;
  33     //RefCount<ReadRequest> readRequest;
  34     //RefCount<WriteRequest> writeRequest;
  35     int fd;
  36
  37     // mmapped memory leads to SEGV and bus errors if it maps beyond file
  38     int64_t minOffset; ///< enforced if not negative (to preserve file headers)
  39     int64_t maxOffset; ///< enforced if not negative (to avoid crashes)
  40
  41     bool error_;
  42
  43     void doClose();
  44 };
  45
  46 #endif /* SQUID_MMAPPEDFILE_H */