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//===-- Terminal.cpp ------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/Terminal.h"
#include "lldb/Host/Config.h"
#include "lldb/Host/PosixApi.h"
#include "llvm/ADT/STLExtras.h"
#include <fcntl.h>
#include <signal.h>
#if LLDB_ENABLE_TERMIOS
#include <termios.h>
#endif
using namespace lldb_private;
bool Terminal::IsATerminal() const { return m_fd >= 0 && ::isatty(m_fd); }
bool Terminal::SetEcho(bool enabled) {
if (FileDescriptorIsValid()) {
#if LLDB_ENABLE_TERMIOS
if (IsATerminal()) {
struct termios fd_termios;
if (::tcgetattr(m_fd, &fd_termios) == 0) {
bool set_corectly = false;
if (enabled) {
if (fd_termios.c_lflag & ECHO)
set_corectly = true;
else
fd_termios.c_lflag |= ECHO;
} else {
if (fd_termios.c_lflag & ECHO)
fd_termios.c_lflag &= ~ECHO;
else
set_corectly = true;
}
if (set_corectly)
return true;
return ::tcsetattr(m_fd, TCSANOW, &fd_termios) == 0;
}
}
#endif // #if LLDB_ENABLE_TERMIOS
}
return false;
}
bool Terminal::SetCanonical(bool enabled) {
if (FileDescriptorIsValid()) {
#if LLDB_ENABLE_TERMIOS
if (IsATerminal()) {
struct termios fd_termios;
if (::tcgetattr(m_fd, &fd_termios) == 0) {
bool set_corectly = false;
if (enabled) {
if (fd_termios.c_lflag & ICANON)
set_corectly = true;
else
fd_termios.c_lflag |= ICANON;
} else {
if (fd_termios.c_lflag & ICANON)
fd_termios.c_lflag &= ~ICANON;
else
set_corectly = true;
}
if (set_corectly)
return true;
return ::tcsetattr(m_fd, TCSANOW, &fd_termios) == 0;
}
}
#endif // #if LLDB_ENABLE_TERMIOS
}
return false;
}
// Default constructor
TerminalState::TerminalState()
: m_tty(), m_tflags(-1),
#if LLDB_ENABLE_TERMIOS
m_termios_up(),
#endif
m_process_group(-1) {
}
// Destructor
TerminalState::~TerminalState() {}
void TerminalState::Clear() {
m_tty.Clear();
m_tflags = -1;
#if LLDB_ENABLE_TERMIOS
m_termios_up.reset();
#endif
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) {
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 (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;
}
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()) {
const int fd = m_tty.GetFileDescriptor();
if (TFlagsIsValid())
fcntl(fd, F_SETFL, m_tflags);
#if LLDB_ENABLE_TERMIOS
if (TTYStateIsValid())
tcsetattr(fd, TCSANOW, m_termios_up.get());
#endif // #if LLDB_ENABLE_TERMIOS
if (ProcessGroupIsValid()) {
// Save the original signal handler.
void (*saved_sigttou_callback)(int) = nullptr;
saved_sigttou_callback = (void (*)(int))signal(SIGTTOU, SIG_IGN);
// Set the process group
tcsetpgrp(fd, m_process_group);
// Restore the original signal handler.
signal(SIGTTOU, saved_sigttou_callback);
}
return true;
}
#endif
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());
}
// 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
}
// Returns true if m_process_group is valid
bool TerminalState::ProcessGroupIsValid() const {
return static_cast<int32_t>(m_process_group) != -1;
}
// Constructor
TerminalStateSwitcher::TerminalStateSwitcher() : m_currentState(UINT32_MAX) {}
// Destructor
TerminalStateSwitcher::~TerminalStateSwitcher() {}
// Returns the number of states that this switcher contains
uint32_t TerminalStateSwitcher::GetNumberOfStates() const {
return llvm::array_lengthof(m_ttystates);
}
// Restore the state at index "idx".
//
// Returns true if the restore was successful, false otherwise.
bool TerminalStateSwitcher::Restore(uint32_t idx) const {
const uint32_t num_states = GetNumberOfStates();
if (idx >= num_states)
return false;
// See if we already are in this state?
if (m_currentState < num_states && (idx == m_currentState) &&
m_ttystates[idx].IsValid())
return true;
// Set the state to match the index passed in and only update the current
// state if there are no errors.
if (m_ttystates[idx].Restore()) {
m_currentState = idx;
return true;
}
// We failed to set the state. The tty state was invalid or not initialized.
return false;
}
// Save the state at index "idx" for file descriptor "fd" and save the process
// group if requested.
//
// Returns true if the restore was successful, false otherwise.
bool TerminalStateSwitcher::Save(uint32_t idx, int fd,
bool save_process_group) {
const uint32_t num_states = GetNumberOfStates();
if (idx < num_states)
return m_ttystates[idx].Save(fd, save_process_group);
return false;
}
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