162 lines
4.2 KiB
C++
162 lines
4.2 KiB
C++
//===-- Terminal.cpp ------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/Terminal.h"
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#include "lldb/Host/Config.h"
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#include "lldb/Host/PosixApi.h"
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#include "llvm/ADT/STLExtras.h"
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#include <csignal>
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#include <fcntl.h>
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#if LLDB_ENABLE_TERMIOS
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#include <termios.h>
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#endif
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using namespace lldb_private;
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bool Terminal::IsATerminal() const { return m_fd >= 0 && ::isatty(m_fd); }
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bool Terminal::SetEcho(bool enabled) {
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if (FileDescriptorIsValid()) {
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#if LLDB_ENABLE_TERMIOS
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if (IsATerminal()) {
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struct termios fd_termios;
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if (::tcgetattr(m_fd, &fd_termios) == 0) {
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bool set_corectly = false;
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if (enabled) {
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if (fd_termios.c_lflag & ECHO)
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set_corectly = true;
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else
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fd_termios.c_lflag |= ECHO;
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} else {
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if (fd_termios.c_lflag & ECHO)
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fd_termios.c_lflag &= ~ECHO;
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else
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set_corectly = true;
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}
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if (set_corectly)
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return true;
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return ::tcsetattr(m_fd, TCSANOW, &fd_termios) == 0;
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}
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}
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#endif // #if LLDB_ENABLE_TERMIOS
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}
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return false;
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}
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bool Terminal::SetCanonical(bool enabled) {
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if (FileDescriptorIsValid()) {
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#if LLDB_ENABLE_TERMIOS
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if (IsATerminal()) {
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struct termios fd_termios;
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if (::tcgetattr(m_fd, &fd_termios) == 0) {
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bool set_corectly = false;
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if (enabled) {
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if (fd_termios.c_lflag & ICANON)
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set_corectly = true;
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else
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fd_termios.c_lflag |= ICANON;
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} else {
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if (fd_termios.c_lflag & ICANON)
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fd_termios.c_lflag &= ~ICANON;
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else
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set_corectly = true;
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}
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if (set_corectly)
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return true;
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return ::tcsetattr(m_fd, TCSANOW, &fd_termios) == 0;
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}
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}
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#endif // #if LLDB_ENABLE_TERMIOS
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}
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return false;
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}
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struct TerminalState::Data {
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#if LLDB_ENABLE_TERMIOS
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struct termios m_termios; ///< Cached terminal state information.
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#endif
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};
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TerminalState::TerminalState(Terminal term, bool save_process_group)
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: m_tty(term) {
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Save(term, save_process_group);
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}
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TerminalState::~TerminalState() { Restore(); }
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void TerminalState::Clear() {
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m_tty.Clear();
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m_tflags = -1;
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m_data.reset();
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m_process_group = -1;
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}
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bool TerminalState::Save(Terminal term, bool save_process_group) {
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Clear();
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m_tty = term;
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if (m_tty.IsATerminal()) {
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int fd = m_tty.GetFileDescriptor();
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#if LLDB_ENABLE_POSIX
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m_tflags = ::fcntl(fd, F_GETFL, 0);
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#if LLDB_ENABLE_TERMIOS
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std::unique_ptr<Data> new_data{new Data()};
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if (::tcgetattr(fd, &new_data->m_termios) == 0)
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m_data = std::move(new_data);
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#endif // LLDB_ENABLE_TERMIOS
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if (save_process_group)
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m_process_group = ::tcgetpgrp(fd);
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#endif // LLDB_ENABLE_POSIX
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}
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return IsValid();
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}
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bool TerminalState::Restore() const {
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#if LLDB_ENABLE_POSIX
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if (IsValid()) {
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const int fd = m_tty.GetFileDescriptor();
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if (TFlagsIsValid())
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fcntl(fd, F_SETFL, m_tflags);
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#if LLDB_ENABLE_TERMIOS
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if (TTYStateIsValid())
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tcsetattr(fd, TCSANOW, &m_data->m_termios);
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#endif // LLDB_ENABLE_TERMIOS
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if (ProcessGroupIsValid()) {
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// Save the original signal handler.
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void (*saved_sigttou_callback)(int) = nullptr;
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saved_sigttou_callback = (void (*)(int))signal(SIGTTOU, SIG_IGN);
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// Set the process group
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tcsetpgrp(fd, m_process_group);
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// Restore the original signal handler.
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signal(SIGTTOU, saved_sigttou_callback);
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}
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return true;
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}
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#endif // LLDB_ENABLE_POSIX
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return false;
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}
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bool TerminalState::IsValid() const {
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return m_tty.FileDescriptorIsValid() &&
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(TFlagsIsValid() || TTYStateIsValid() || ProcessGroupIsValid());
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}
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bool TerminalState::TFlagsIsValid() const { return m_tflags != -1; }
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bool TerminalState::TTYStateIsValid() const { return bool(m_data); }
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bool TerminalState::ProcessGroupIsValid() const {
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return static_cast<int32_t>(m_process_group) != -1;
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}
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