diff options
Diffstat (limited to 'src/corelib/kernel/qsharedmemory_systemv.cpp')
| -rw-r--r-- | src/corelib/kernel/qsharedmemory_systemv.cpp | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/src/corelib/kernel/qsharedmemory_systemv.cpp b/src/corelib/kernel/qsharedmemory_systemv.cpp deleted file mode 100644 index cdeed6a668..0000000000 --- a/src/corelib/kernel/qsharedmemory_systemv.cpp +++ /dev/null @@ -1,226 +0,0 @@ -// Copyright (C) 2016 The Qt Company Ltd. -// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only - -#include "qplatformdefs.h" - -#include "qsharedmemory.h" -#include "qsharedmemory_p.h" -#include "qsystemsemaphore.h" -#include <qdir.h> -#include <qdebug.h> - -#include <errno.h> - -#ifndef QT_POSIX_IPC - -#ifndef QT_NO_SHAREDMEMORY -#include <sys/types.h> -#include <sys/ipc.h> -#include <sys/shm.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <unistd.h> -#endif //QT_NO_SHAREDMEMORY - -#include "private/qcore_unix_p.h" - -#ifndef QT_NO_SHAREDMEMORY -QT_BEGIN_NAMESPACE - -using namespace Qt::StringLiterals; - -/*! - \internal - - If not already made create the handle used for accessing the shared memory. -*/ -key_t QSharedMemoryPrivate::handle() -{ - // already made - if (unix_key) - return unix_key; - - // don't allow making handles on empty keys - if (nativeKey.isEmpty()) { - errorString = QSharedMemory::tr("%1: key is empty").arg("QSharedMemory::handle:"_L1); - error = QSharedMemory::KeyError; - return 0; - } - - // ftok requires that an actual file exists somewhere - if (!QFile::exists(nativeKey)) { - errorString = QSharedMemory::tr("%1: UNIX key file doesn't exist").arg("QSharedMemory::handle:"_L1); - error = QSharedMemory::NotFound; - return 0; - } - - unix_key = ftok(QFile::encodeName(nativeKey).constData(), 'Q'); - if (-1 == unix_key) { - errorString = QSharedMemory::tr("%1: ftok failed").arg("QSharedMemory::handle:"_L1); - error = QSharedMemory::KeyError; - unix_key = 0; - } - return unix_key; -} - -#endif // QT_NO_SHAREDMEMORY - -#if !(defined(QT_NO_SHAREDMEMORY) && defined(QT_NO_SYSTEMSEMAPHORE)) -/*! - \internal - Creates the unix file if needed. - returns \c true if the unix file was created. - - -1 error - 0 already existed - 1 created - */ -int QT_PREPEND_NAMESPACE(QSharedMemoryPrivate)::createUnixKeyFile(const QString &fileName) -{ - int fd = qt_safe_open(QFile::encodeName(fileName).constData(), - O_EXCL | O_CREAT | O_RDWR, 0640); - if (-1 == fd) { - if (errno == EEXIST) - return 0; - return -1; - } else { - close(fd); - } - return 1; -} -#endif // QT_NO_SHAREDMEMORY && QT_NO_SYSTEMSEMAPHORE - -#ifndef QT_NO_SHAREDMEMORY - -bool QSharedMemoryPrivate::cleanHandle() -{ - unix_key = 0; - return true; -} - -bool QSharedMemoryPrivate::create(qsizetype size) -{ - // build file if needed - bool createdFile = false; - int built = createUnixKeyFile(nativeKey); - if (built == -1) { - errorString = QSharedMemory::tr("%1: unable to make key").arg("QSharedMemory::handle:"_L1); - error = QSharedMemory::KeyError; - return false; - } - if (built == 1) { - createdFile = true; - } - - // get handle - if (!handle()) { - if (createdFile) - QFile::remove(nativeKey); - return false; - } - - // create - if (-1 == shmget(unix_key, size_t(size), 0600 | IPC_CREAT | IPC_EXCL)) { - const auto function = "QSharedMemory::create"_L1; - switch (errno) { - case EINVAL: - errorString = QSharedMemory::tr("%1: system-imposed size restrictions").arg("QSharedMemory::handle"_L1); - error = QSharedMemory::InvalidSize; - break; - default: - setErrorString(function); - } - if (createdFile && error != QSharedMemory::AlreadyExists) - QFile::remove(nativeKey); - return false; - } - - return true; -} - -bool QSharedMemoryPrivate::attach(QSharedMemory::AccessMode mode) -{ - // grab the shared memory segment id - int id = shmget(unix_key, 0, (mode == QSharedMemory::ReadOnly ? 0400 : 0600)); - if (-1 == id) { - setErrorString("QSharedMemory::attach (shmget)"_L1); - return false; - } - - // grab the memory - memory = shmat(id, nullptr, (mode == QSharedMemory::ReadOnly ? SHM_RDONLY : 0)); - if ((void *)-1 == memory) { - memory = nullptr; - setErrorString("QSharedMemory::attach (shmat)"_L1); - return false; - } - - // grab the size - shmid_ds shmid_ds; - if (!shmctl(id, IPC_STAT, &shmid_ds)) { - size = (qsizetype)shmid_ds.shm_segsz; - } else { - setErrorString("QSharedMemory::attach (shmctl)"_L1); - return false; - } - - return true; -} - -bool QSharedMemoryPrivate::detach() -{ - // detach from the memory segment - if (-1 == shmdt(memory)) { - const auto function = "QSharedMemory::detach"_L1; - switch (errno) { - case EINVAL: - errorString = QSharedMemory::tr("%1: not attached").arg(function); - error = QSharedMemory::NotFound; - break; - default: - setErrorString(function); - } - return false; - } - memory = nullptr; - size = 0; - - // Get the number of current attachments - int id = shmget(unix_key, 0, 0400); - cleanHandle(); - - struct shmid_ds shmid_ds; - if (0 != shmctl(id, IPC_STAT, &shmid_ds)) { - switch (errno) { - case EINVAL: - return true; - default: - return false; - } - } - // If there are no attachments then remove it. - if (shmid_ds.shm_nattch == 0) { - // mark for removal - if (-1 == shmctl(id, IPC_RMID, &shmid_ds)) { - setErrorString("QSharedMemory::remove"_L1); - switch (errno) { - case EINVAL: - return true; - default: - return false; - } - } - - // remove file - if (!QFile::remove(nativeKey)) - return false; - } - return true; -} - - -QT_END_NAMESPACE - -#endif // QT_NO_SHAREDMEMORY - -#endif // QT_POSIX_IPC |