diff options
Diffstat (limited to 'src/platformsupport/fbconvenience/qfbvthandler.cpp')
| -rw-r--r-- | src/platformsupport/fbconvenience/qfbvthandler.cpp | 174 |
1 files changed, 137 insertions, 37 deletions
diff --git a/src/platformsupport/fbconvenience/qfbvthandler.cpp b/src/platformsupport/fbconvenience/qfbvthandler.cpp index 511f723dd9..c46e470c34 100644 --- a/src/platformsupport/fbconvenience/qfbvthandler.cpp +++ b/src/platformsupport/fbconvenience/qfbvthandler.cpp @@ -1,7 +1,7 @@ /**************************************************************************** ** -** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). -** Contact: http://www.qt-project.org/legal +** Copyright (C) 2015 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ ** ** This file is part of the plugins of the Qt Toolkit. ** @@ -10,9 +10,9 @@ ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and Digia. For licensing terms and -** conditions see http://qt.digia.com/licensing. For further information -** use the contact form at http://qt.digia.com/contact-us. +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see http://www.qt.io/terms-conditions. For further +** information use the contact form at http://www.qt.io/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser @@ -23,8 +23,8 @@ ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** -** In addition, as a special exception, Digia gives you certain additional -** rights. These rights are described in the Digia Qt LGPL Exception +** As a special exception, The Qt Company gives you certain additional +** rights. These rights are described in The Qt Company LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** $QT_END_LICENSE$ @@ -32,72 +32,172 @@ ****************************************************************************/ #include "qfbvthandler_p.h" -#include <QtCore/private/qcrashhandler_p.h> -#include <QtGui/private/qguiapplication_p.h> +#include <QtCore/QSocketNotifier> -#if defined(Q_OS_LINUX) && !defined(QT_NO_EVDEV) -#define HAS_VT -#endif +#if defined(Q_OS_LINUX) && !defined(Q_OS_ANDROID) && (!defined(QT_NO_EVDEV) || !defined(QT_NO_LIBINPUT)) -#ifdef HAS_VT +#define VTH_ENABLED +#include <private/qcore_unix_p.h> +#include <unistd.h> +#include <signal.h> +#include <errno.h> +#include <fcntl.h> +#include <sys/signalfd.h> #include <sys/ioctl.h> #include <linux/kd.h> +#ifndef KDSKBMUTE +#define KDSKBMUTE 0x4B51 +#endif + #ifdef K_OFF #define KBD_OFF_MODE K_OFF #else #define KBD_OFF_MODE K_RAW #endif -#endif // HAS_VT +#endif QT_BEGIN_NAMESPACE -QFbVtHandler *QFbVtHandler::self = 0; +#ifdef VTH_ENABLED +static void setTTYCursor(bool enable) +{ + const char * const devs[] = { "/dev/tty0", "/dev/tty", "/dev/console", 0 }; + int fd = -1; + for (const char * const *dev = devs; *dev; ++dev) { + fd = QT_OPEN(*dev, O_RDWR); + if (fd != -1) { + // Enable/disable screen blanking and the blinking cursor. + const char *termctl = enable ? "\033[9;15]\033[?33h\033[?25h\033[?0c" : "\033[9;0]\033[?33l\033[?25l\033[?1c"; + QT_WRITE(fd, termctl, strlen(termctl) + 1); + QT_CLOSE(fd); + return; + } + } +} +#endif QFbVtHandler::QFbVtHandler(QObject *parent) - : QObject(parent), m_tty(-1) + : QObject(parent), + m_tty(-1), + m_signalFd(-1), + m_signalNotifier(0) { - Q_ASSERT(!self); - self = this; +#ifdef VTH_ENABLED + setTTYCursor(false); + + if (isatty(0)) { + m_tty = 0; + ioctl(m_tty, KDGKBMODE, &m_oldKbdMode); + + if (!qEnvironmentVariableIntValue("QT_QPA_ENABLE_TERMINAL_KEYBOARD")) { + // Disable the tty keyboard. + ioctl(m_tty, KDSKBMUTE, 1); + ioctl(m_tty, KDSKBMODE, KBD_OFF_MODE); + } + } -#ifdef HAS_VT - if (!isatty(0)) - return; + // SIGSEGV and such cannot safely be blocked. We cannot handle them in an + // async-safe manner either. Restoring the keyboard, video mode, etc. may + // all contain calls that cannot safely be made from a signal handler. + + // Other signals: block them and use signalfd. + sigset_t mask; + sigemptyset(&mask); + + // Catch Ctrl+C. + sigaddset(&mask, SIGINT); + + // Ctrl+Z. Up to the platform plugins to handle it in a meaningful way. + sigaddset(&mask, SIGTSTP); + sigaddset(&mask, SIGCONT); + + // Default signal used by kill. To overcome the common issue of no cleaning + // up when killing a locally started app via a remote session. + sigaddset(&mask, SIGTERM); - m_tty = 0; - ::ioctl(m_tty, KDGKBMODE, &m_oldKbdMode); - if (!qgetenv("QT_QPA_ENABLE_TERMINAL_KEYBOARD").toInt()) { - ::ioctl(m_tty, KDSKBMODE, KBD_OFF_MODE); - QGuiApplicationPrivate *appd = QGuiApplicationPrivate::instance(); - Q_ASSERT(appd); - QSegfaultHandler::initialize(appd->argv, appd->argc); - QSegfaultHandler::installCrashHandler(crashHandler); + m_signalFd = signalfd(-1, &mask, SFD_CLOEXEC); + if (m_signalFd < 0) { + qErrnoWarning(errno, "signalfd() failed"); + } else { + m_signalNotifier = new QSocketNotifier(m_signalFd, QSocketNotifier::Read, this); + connect(m_signalNotifier, &QSocketNotifier::activated, this, &QFbVtHandler::handleSignal); + + // Block the signals that are handled via signalfd. Applies only to the current + // thread, but new threads will inherit the creator's signal mask. + pthread_sigmask(SIG_BLOCK, &mask, 0); } #endif } QFbVtHandler::~QFbVtHandler() { - self->cleanup(); - self = 0; +#ifdef VTH_ENABLED + restoreKeyboard(); + setTTYCursor(true); + + if (m_signalFd != -1) + close(m_signalFd); +#endif } -void QFbVtHandler::cleanup() +void QFbVtHandler::restoreKeyboard() { +#ifdef VTH_ENABLED if (m_tty == -1) return; -#ifdef HAS_VT - ::ioctl(m_tty, KDSKBMODE, m_oldKbdMode); + ioctl(m_tty, KDSKBMUTE, 0); + ioctl(m_tty, KDSKBMODE, m_oldKbdMode); +#endif +} + +// To be called from the slot connected to suspendRequested() in case the +// platform plugin does in fact allow suspending on Ctrl+Z. +void QFbVtHandler::suspend() +{ +#ifdef VTH_ENABLED + kill(getpid(), SIGSTOP); +#endif +} + +void QFbVtHandler::handleSignal() +{ +#ifdef VTH_ENABLED + m_signalNotifier->setEnabled(false); + + signalfd_siginfo sig; + if (read(m_signalFd, &sig, sizeof(sig)) == sizeof(sig)) { + switch (sig.ssi_signo) { + case SIGINT: // fallthrough + case SIGTERM: + handleInt(); + break; + case SIGTSTP: + emit suspendRequested(); + break; + case SIGCONT: + emit resumed(); + break; + default: + break; + } + } + + m_signalNotifier->setEnabled(true); #endif } -void QFbVtHandler::crashHandler() +void QFbVtHandler::handleInt() { - Q_ASSERT(self); - self->cleanup(); +#ifdef VTH_ENABLED + emit interrupted(); + restoreKeyboard(); + setTTYCursor(true); + _exit(1); +#endif } QT_END_NAMESPACE |