lldb/tools/debugserver/source/TTYState.h

   1 //===-- TTYState.h ----------------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 //  Created by Greg Clayton on 3/26/07.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLDB_TOOLS_DEBUGSERVER_SOURCE_TTYSTATE_H
  14 #define LLDB_TOOLS_DEBUGSERVER_SOURCE_TTYSTATE_H
  15
  16 #include <cstdint>
  17 #include <termios.h>
  18
  19 class TTYState {
  20 public:
  21   TTYState();
  22   ~TTYState();
  23
  24   bool GetTTYState(int fd, bool saveProcessGroup);
  25   bool SetTTYState() const;
  26
  27   bool IsValid() const {
  28     return FileDescriptorValid() && TFlagsValid() && TTYStateValid();
  29   }
  30   bool FileDescriptorValid() const { return m_fd >= 0; }
  31   bool TFlagsValid() const { return m_tflags != -1; }
  32   bool TTYStateValid() const { return m_ttystateErr == 0; }
  33   bool ProcessGroupValid() const { return m_processGroup != -1; }
  34
  35 protected:
  36   int m_fd; // File descriptor
  37   int m_tflags;
  38   int m_ttystateErr;
  39   struct termios m_ttystate;
  40   pid_t m_processGroup;
  41 };
  42
  43 class TTYStateSwitcher {
  44 public:
  45   TTYStateSwitcher();
  46   ~TTYStateSwitcher();
  47
  48   bool GetState(uint32_t idx, int fd, bool saveProcessGroup);
  49   bool SetState(uint32_t idx) const;
  50   uint32_t NumStates() const { return sizeof(m_ttystates) / sizeof(TTYState); }
  51   bool ValidStateIndex(uint32_t idx) const { return idx < NumStates(); }
  52
  53 protected:
  54   mutable uint32_t m_currentState;
  55   TTYState m_ttystates[2];
  56 };
  57
  58 #endif