2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
//===-- TTYState.cpp --------------------------------------------*- C++ -*-===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Created by Greg Clayton on 3/26/07.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "TTYState.h"
|
|
#include <fcntl.h>
|
|
#include <sys/signal.h>
|
|
#include <unistd.h>
|
|
|
|
TTYState::TTYState()
|
|
: m_fd(-1), m_tflags(-1), m_ttystateErr(-1), m_processGroup(-1) {}
|
|
|
|
TTYState::~TTYState() {}
|
|
|
|
bool TTYState::GetTTYState(int fd, bool saveProcessGroup) {
|
|
if (fd >= 0 && ::isatty(fd)) {
|
|
m_fd = fd;
|
|
m_tflags = fcntl(fd, F_GETFL, 0);
|
|
m_ttystateErr = tcgetattr(fd, &m_ttystate);
|
|
if (saveProcessGroup)
|
|
m_processGroup = tcgetpgrp(0);
|
|
else
|
|
m_processGroup = -1;
|
|
} else {
|
|
m_fd = -1;
|
|
m_tflags = -1;
|
|
m_ttystateErr = -1;
|
|
m_processGroup = -1;
|
|
}
|
|
return m_ttystateErr == 0;
|
|
}
|
|
|
|
bool TTYState::SetTTYState() const {
|
|
int result = 0;
|
|
if (IsValid()) {
|
|
if (TFlagsValid())
|
|
result = fcntl(m_fd, F_SETFL, m_tflags);
|
|
|
|
if (TTYStateValid())
|
|
result = tcsetattr(m_fd, TCSANOW, &m_ttystate);
|
|
|
|
if (ProcessGroupValid()) {
|
|
// Save the original signal handler.
|
|
void (*saved_sigttou_callback)(int) = NULL;
|
|
saved_sigttou_callback = (void (*)(int))signal(SIGTTOU, SIG_IGN);
|
|
// Set the process group
|
|
result = tcsetpgrp(m_fd, m_processGroup);
|
|
// Restore the original signal handler.
|
|
signal(SIGTTOU, saved_sigttou_callback);
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
TTYStateSwitcher::TTYStateSwitcher() : m_currentState(~0) {}
|
|
|
|
TTYStateSwitcher::~TTYStateSwitcher() {}
|
|
|
|
bool TTYStateSwitcher::GetState(uint32_t idx, int fd, bool saveProcessGroup) {
|
|
if (ValidStateIndex(idx))
|
|
return m_ttystates[idx].GetTTYState(fd, saveProcessGroup);
|
|
return false;
|
|
}
|
|
|
|
bool TTYStateSwitcher::SetState(uint32_t idx) const {
|
|
if (!ValidStateIndex(idx))
|
|
return false;
|
|
|
|
// See if we already are in this state?
|
|
if (ValidStateIndex(m_currentState) && (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].SetTTYState()) {
|
|
m_currentState = idx;
|
|
return true;
|
|
}
|
|
|
|
// We failed to set the state. The tty state was invalid or not
|
|
// initialized.
|
|
return false;
|
|
}
|