diff options
Diffstat (limited to 'src/corelib/kernel/qsharedmemory_posix.cpp')
-rw-r--r-- | src/corelib/kernel/qsharedmemory_posix.cpp | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/src/corelib/kernel/qsharedmemory_posix.cpp b/src/corelib/kernel/qsharedmemory_posix.cpp deleted file mode 100644 index d83ff4cb92..0000000000 --- a/src/corelib/kernel/qsharedmemory_posix.cpp +++ /dev/null @@ -1,236 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2015 Konstantin Ritt <ritt.ks@gmail.com> -** Copyright (C) 2016 The Qt Company Ltd. -** Copyright (C) 2015 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Tobias Koenig <tobias.koenig@kdab.com> -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the QtCore module of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:LGPL$ -** Commercial License Usage -** 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 The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** GNU Lesser General Public License Usage -** Alternatively, this file may be used under the terms of the GNU Lesser -** General Public License version 3 as published by the Free Software -** Foundation and appearing in the file LICENSE.LGPL3 included in the -** packaging of this file. Please review the following information to -** ensure the GNU Lesser General Public License version 3 requirements -** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. -** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 2.0 or (at your option) the GNU General -** Public license version 3 or any later version approved by the KDE Free -** Qt Foundation. The licenses are as published by the Free Software -** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 -** included in the packaging of this file. Please review the following -** information to ensure the GNU General Public License requirements will -** be met: https://www.gnu.org/licenses/gpl-2.0.html and -** https://www.gnu.org/licenses/gpl-3.0.html. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "qplatformdefs.h" - -#include "qsharedmemory.h" -#include "qsharedmemory_p.h" -#include "qsystemsemaphore.h" -#include <qfile.h> - -#include <errno.h> - -#ifdef QT_POSIX_IPC - -#ifndef QT_NO_SHAREDMEMORY -#include <sys/types.h> -#include <sys/mman.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <unistd.h> - -#include "private/qcore_unix_p.h" - -QT_BEGIN_NAMESPACE - -int QSharedMemoryPrivate::handle() -{ - // don't allow making handles on empty keys - const QString safeKey = makePlatformSafeKey(key); - if (safeKey.isEmpty()) { - errorString = QSharedMemory::tr("%1: key is empty").arg(QLatin1String("QSharedMemory::handle")); - error = QSharedMemory::KeyError; - return 0; - } - - return 1; -} - -bool QSharedMemoryPrivate::cleanHandle() -{ - qt_safe_close(hand); - hand = -1; - - return true; -} - -bool QSharedMemoryPrivate::create(qsizetype size) -{ - if (!handle()) - return false; - - const QByteArray shmName = QFile::encodeName(makePlatformSafeKey(key)); - - int fd; -#ifdef O_CLOEXEC - // First try with O_CLOEXEC flag, if that fails, fall back to normal flags - EINTR_LOOP(fd, ::shm_open(shmName.constData(), O_RDWR | O_CREAT | O_EXCL | O_CLOEXEC, 0600)); - if (fd == -1) - EINTR_LOOP(fd, ::shm_open(shmName.constData(), O_RDWR | O_CREAT | O_EXCL, 0600)); -#else - EINTR_LOOP(fd, ::shm_open(shmName.constData(), O_RDWR | O_CREAT | O_EXCL, 0600)); -#endif - if (fd == -1) { - const int errorNumber = errno; - const QLatin1String function("QSharedMemory::attach (shm_open)"); - switch (errorNumber) { - case ENAMETOOLONG: - case EINVAL: - errorString = QSharedMemory::tr("%1: bad name").arg(function); - error = QSharedMemory::KeyError; - break; - default: - setErrorString(function); - } - return false; - } - - // the size may only be set once - int ret; - EINTR_LOOP(ret, QT_FTRUNCATE(fd, size)); - if (ret == -1) { - setErrorString(QLatin1String("QSharedMemory::create (ftruncate)")); - qt_safe_close(fd); - return false; - } - - qt_safe_close(fd); - - return true; -} - -bool QSharedMemoryPrivate::attach(QSharedMemory::AccessMode mode) -{ - const QByteArray shmName = QFile::encodeName(makePlatformSafeKey(key)); - - const int oflag = (mode == QSharedMemory::ReadOnly ? O_RDONLY : O_RDWR); - const mode_t omode = (mode == QSharedMemory::ReadOnly ? 0400 : 0600); - -#ifdef O_CLOEXEC - // First try with O_CLOEXEC flag, if that fails, fall back to normal flags - EINTR_LOOP(hand, ::shm_open(shmName.constData(), oflag | O_CLOEXEC, omode)); - if (hand == -1) - EINTR_LOOP(hand, ::shm_open(shmName.constData(), oflag, omode)); -#else - EINTR_LOOP(hand, ::shm_open(shmName.constData(), oflag, omode)); -#endif - if (hand == -1) { - const int errorNumber = errno; - const QLatin1String function("QSharedMemory::attach (shm_open)"); - switch (errorNumber) { - case ENAMETOOLONG: - case EINVAL: - errorString = QSharedMemory::tr("%1: bad name").arg(function); - error = QSharedMemory::KeyError; - break; - default: - setErrorString(function); - } - hand = -1; - return false; - } - - // grab the size - QT_STATBUF st; - if (QT_FSTAT(hand, &st) == -1) { - setErrorString(QLatin1String("QSharedMemory::attach (fstat)")); - cleanHandle(); - return false; - } - size = qsizetype(st.st_size); - - // grab the memory - const int mprot = (mode == QSharedMemory::ReadOnly ? PROT_READ : PROT_READ | PROT_WRITE); - memory = QT_MMAP(0, size_t(size), mprot, MAP_SHARED, hand, 0); - if (memory == MAP_FAILED || !memory) { - setErrorString(QLatin1String("QSharedMemory::attach (mmap)")); - cleanHandle(); - memory = 0; - size = 0; - return false; - } - -#ifdef F_ADD_SEALS - // Make sure the shared memory region will not shrink - // otherwise someone could cause SIGBUS on us. - // (see http://lwn.net/Articles/594919/) - fcntl(hand, F_ADD_SEALS, F_SEAL_SHRINK); -#endif - - return true; -} - -bool QSharedMemoryPrivate::detach() -{ - // detach from the memory segment - if (::munmap(memory, size_t(size)) == -1) { - setErrorString(QLatin1String("QSharedMemory::detach (munmap)")); - return false; - } - memory = 0; - size = 0; - -#ifdef Q_OS_QNX - // On QNX the st_nlink field of struct stat contains the number of - // active shm_open() connections to the shared memory file, so we - // can use it to automatically clean up the file once the last - // user has detached from it. - - // get the number of current attachments - int shm_nattch = 0; - QT_STATBUF st; - if (QT_FSTAT(hand, &st) == 0) { - // subtract 2 from linkcount: one for our own open and one for the dir entry - shm_nattch = st.st_nlink - 2; - } - - cleanHandle(); - - // if there are no attachments then unlink the shared memory - if (shm_nattch == 0) { - const QByteArray shmName = QFile::encodeName(makePlatformSafeKey(key)); - if (::shm_unlink(shmName.constData()) == -1 && errno != ENOENT) - setErrorString(QLatin1String("QSharedMemory::detach (shm_unlink)")); - } -#else - // On non-QNX systems (tested Linux and Haiku), the st_nlink field is always 1, - // so we'll simply leak the shared memory files. - cleanHandle(); -#endif - - return true; -} - -QT_END_NAMESPACE - -#endif // QT_NO_SHAREDMEMORY - -#endif // QT_POSIX_IPC |