SharedMemory.h 1.5 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243
  1. #pragma once
  2. #include <AK/AKString.h>
  3. #include <AK/RetainPtr.h>
  4. #include <AK/Retainable.h>
  5. #include <Kernel/File.h>
  6. #include <Kernel/KResult.h>
  7. #include <Kernel/UnixTypes.h>
  8. class VMObject;
  9. class SharedMemory : public File {
  10. public:
  11. static KResultOr<Retained<SharedMemory>> open(const String& name, int flags, mode_t);
  12. static KResult unlink(const String& name);
  13. virtual ~SharedMemory() override;
  14. String name() const { return m_name; }
  15. virtual KResult truncate(off_t) override;
  16. VMObject* vmo() { return m_vmo.ptr(); }
  17. const VMObject* vmo() const { return m_vmo.ptr(); }
  18. uid_t uid() const { return m_uid; }
  19. gid_t gid() const { return m_gid; }
  20. private:
  21. // ^File
  22. virtual bool can_read(FileDescriptor&) const override { return true; }
  23. virtual bool can_write(FileDescriptor&) const override { return true; }
  24. virtual int read(FileDescriptor&, byte*, int) override;
  25. virtual int write(FileDescriptor&, const byte*, int) override;
  26. virtual String absolute_path(const FileDescriptor&) const override;
  27. virtual const char* class_name() const override { return "SharedMemory"; }
  28. virtual bool is_shared_memory() const override { return true; }
  29. virtual KResultOr<Region*> mmap(Process&, LinearAddress, size_t offset, size_t size, int prot) override;
  30. SharedMemory(const String& name, uid_t, gid_t, mode_t);
  31. String m_name;
  32. uid_t m_uid { 0 };
  33. gid_t m_gid { 0 };
  34. mode_t m_mode { 0 };
  35. RetainPtr<VMObject> m_vmo;
  36. };