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     MmappedFile(char const *path);
  13     ~MmappedFile();
  14     virtual void open(int flags, mode_t mode, RefCount<IORequestor> callback);
  15     virtual void create(int flags, mode_t mode, RefCount<IORequestor> callback);
  16     virtual void read(ReadRequest *);
  17     virtual void write(WriteRequest *);
  18     virtual void close();
  19     virtual bool error() const;
  20     virtual int getFD() const { return fd;}
  21
  22     virtual bool canRead() const;
  23     virtual bool canWrite() const;
  24     virtual bool ioInProgress() const;
  25
  26 private:
  27     char const *path_;
  28     RefCount<IORequestor> ioRequestor;
  29     //RefCount<ReadRequest> readRequest;
  30     //RefCount<WriteRequest> writeRequest;
  31     int fd;
  32
  33     // mmapped memory leads to SEGV and bus errors if it maps beyond file
  34     int64_t minOffset; ///< enforced if not negative (to preserve file headers)
  35     int64_t maxOffset; ///< enforced if not negative (to avoid crashes)
  36
  37     bool error_;
  38
  39     void doClose();
  40
  41     CBDATA_CLASS2(MmappedFile);
  42 };
  43
  44 #endif /* SQUID_MMAPPEDFILE_H */