Index: lldb/include/lldb/Host/Terminal.h =================================================================== --- lldb/include/lldb/Host/Terminal.h +++ lldb/include/lldb/Host/Terminal.h @@ -13,6 +13,10 @@ #include "lldb/Host/Config.h" #include "lldb/lldb-private.h" +#if LLDB_ENABLE_TERMIOS +#include +#endif + struct termios; namespace lldb_private { @@ -41,17 +45,26 @@ int m_fd; // This may or may not be a terminal file descriptor }; -/// \class State Terminal.h "lldb/Host/Terminal.h" -/// A terminal state saving/restoring class. +/// \class TerminalState Terminal.h "lldb/Host/Terminal.h" +/// A RAII-friendly terminal state saving/restoring class. /// /// This class can be used to remember the terminal state for a file /// descriptor and later restore that state as it originally was. class TerminalState { public: - /// Default constructor - TerminalState(); + /// Construct a new instance and optionally save terminal state. + /// + /// \param[in] fd + /// The file descriptor to save the state of. If -1, the class will + /// be initialized without saved state. + /// + /// \param[in] save_process_group + /// If \b true, save the process group settings, else do not + /// save the process group settings for a TTY. + TerminalState(int fd = -1, bool save_process_group = false); - /// Destructor + /// Destroy the instance, restoring terminal state if saved. If restoring + /// state is undesirable, the instance needs to be reset before destruction. ~TerminalState(); /// Save the TTY state for \a fd. @@ -115,11 +128,11 @@ bool ProcessGroupIsValid() const; // Member variables - Terminal m_tty; ///< A terminal - int m_tflags = -1; ///< Cached tflags information. + Terminal m_tty; ///< A terminal + int m_tflags = -1; ///< Cached tflags information. + bool m_termios_saved = false; ///< Indication whether termios was saved. #if LLDB_ENABLE_TERMIOS - std::unique_ptr - m_termios_up; ///< Cached terminal state information. + struct termios m_termios; ///< Cached terminal state information. #endif lldb::pid_t m_process_group = -1; ///< Cached process group information. }; Index: lldb/source/Host/common/Terminal.cpp =================================================================== --- lldb/source/Host/common/Terminal.cpp +++ lldb/source/Host/common/Terminal.cpp @@ -15,10 +15,6 @@ #include #include -#if LLDB_ENABLE_TERMIOS -#include -#endif - using namespace lldb_private; bool Terminal::IsATerminal() const { return m_fd >= 0 && ::isatty(m_fd); } @@ -81,63 +77,39 @@ return false; } -// Default constructor -TerminalState::TerminalState() - : m_tty() -#if LLDB_ENABLE_TERMIOS - , - m_termios_up() -#endif -{ +TerminalState::TerminalState(int fd, bool save_process_group) : m_tty(fd) { + if (fd != -1) + Save(fd, save_process_group); } -// Destructor -TerminalState::~TerminalState() = default; +TerminalState::~TerminalState() { + Restore(); +} void TerminalState::Clear() { m_tty.Clear(); m_tflags = -1; -#if LLDB_ENABLE_TERMIOS - m_termios_up.reset(); -#endif + m_termios_saved = false; m_process_group = -1; } -// Save the current state of the TTY for the file descriptor "fd" and if -// "save_process_group" is true, attempt to save the process group info for the -// TTY. bool TerminalState::Save(int fd, bool save_process_group) { + Clear(); m_tty.SetFileDescriptor(fd); if (m_tty.IsATerminal()) { #if LLDB_ENABLE_POSIX m_tflags = ::fcntl(fd, F_GETFL, 0); -#endif #if LLDB_ENABLE_TERMIOS - if (m_termios_up == nullptr) - m_termios_up.reset(new struct termios); - int err = ::tcgetattr(fd, m_termios_up.get()); - if (err != 0) - m_termios_up.reset(); -#endif // #if LLDB_ENABLE_TERMIOS -#if LLDB_ENABLE_POSIX + if (::tcgetattr(fd, &m_termios) == 0) + m_termios_saved = true; +#endif // LLDB_ENABLE_TERMIOS if (save_process_group) m_process_group = ::tcgetpgrp(0); - else - m_process_group = -1; -#endif - } else { - m_tty.Clear(); - m_tflags = -1; -#if LLDB_ENABLE_TERMIOS - m_termios_up.reset(); -#endif - m_process_group = -1; +#endif // LLDB_ENABLE_POSIX } return IsValid(); } -// Restore the state of the TTY using the cached values from a previous call to -// Save(). bool TerminalState::Restore() const { #if LLDB_ENABLE_POSIX if (IsValid()) { @@ -147,8 +119,8 @@ #if LLDB_ENABLE_TERMIOS if (TTYStateIsValid()) - tcsetattr(fd, TCSANOW, m_termios_up.get()); -#endif // #if LLDB_ENABLE_TERMIOS + tcsetattr(fd, TCSANOW, &m_termios); +#endif // LLDB_ENABLE_TERMIOS if (ProcessGroupIsValid()) { // Save the original signal handler. @@ -161,30 +133,19 @@ } return true; } -#endif +#endif // LLDB_ENABLE_POSIX return false; } -// Returns true if this object has valid saved TTY state settings that can be -// used to restore a previous state. bool TerminalState::IsValid() const { return m_tty.FileDescriptorIsValid() && - (TFlagsIsValid() || TTYStateIsValid()); + (TFlagsIsValid() || TTYStateIsValid() || ProcessGroupIsValid()); } -// Returns true if m_tflags is valid bool TerminalState::TFlagsIsValid() const { return m_tflags != -1; } -// Returns true if m_ttystate is valid -bool TerminalState::TTYStateIsValid() const { -#if LLDB_ENABLE_TERMIOS - return m_termios_up != nullptr; -#else - return false; -#endif -} +bool TerminalState::TTYStateIsValid() const { return m_termios_saved; } -// Returns true if m_process_group is valid bool TerminalState::ProcessGroupIsValid() const { return static_cast(m_process_group) != -1; } Index: lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp =================================================================== --- lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp +++ lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp @@ -355,7 +355,6 @@ PyEval_InitThreads(); } - TerminalState m_stdin_tty_state; PyGILState_STATE m_gil_state = PyGILState_UNLOCKED; bool m_was_already_initialized = false; }; Index: lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPythonImpl.h =================================================================== --- lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPythonImpl.h +++ lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPythonImpl.h @@ -430,11 +430,9 @@ int stdin_fd = GetInputFD(); if (stdin_fd >= 0) { Terminal terminal(stdin_fd); - TerminalState terminal_state; - const bool is_a_tty = terminal.IsATerminal(); + TerminalState terminal_state(stdin_fd); - if (is_a_tty) { - terminal_state.Save(stdin_fd, false); + if (terminal.IsATerminal()) { terminal.SetCanonical(false); terminal.SetEcho(true); } @@ -464,9 +462,6 @@ run_string.Printf("run_python_interpreter (%s)", m_python->GetDictionaryName()); PyRun_SimpleString(run_string.GetData()); - - if (is_a_tty) - terminal_state.Restore(); } } SetIsDone(true); Index: lldb/source/Target/Process.cpp =================================================================== --- lldb/source/Target/Process.cpp +++ lldb/source/Target/Process.cpp @@ -4351,9 +4351,8 @@ SetIsDone(false); const int read_fd = m_read_file.GetDescriptor(); - TerminalState terminal_state; - terminal_state.Save(read_fd, false); Terminal terminal(read_fd); + TerminalState terminal_state(read_fd, false); terminal.SetCanonical(false); terminal.SetEcho(false); // FD_ZERO, FD_SET are not supported on windows @@ -4399,7 +4398,6 @@ } m_is_running = false; #endif - terminal_state.Restore(); } void Cancel() override {