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-rw-r--r--src/corelib/kernel/qsharedmemory_unix.cpp215
1 files changed, 16 insertions, 199 deletions
diff --git a/src/corelib/kernel/qsharedmemory_unix.cpp b/src/corelib/kernel/qsharedmemory_unix.cpp
index 8d616af4fe..ec6223142f 100644
--- a/src/corelib/kernel/qsharedmemory_unix.cpp
+++ b/src/corelib/kernel/qsharedmemory_unix.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 QtCore module 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.
**
** $QT_END_LICENSE$
@@ -36,15 +36,18 @@
#include "qsharedmemory.h"
#include "qsharedmemory_p.h"
#include "qsystemsemaphore.h"
-#include <qdir.h>
#include <qdebug.h>
#include <errno.h>
#ifndef QT_NO_SHAREDMEMORY
#include <sys/types.h>
+#ifndef QT_POSIX_IPC
#include <sys/ipc.h>
#include <sys/shm.h>
+#else
+#include <sys/mman.h>
+#endif
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
@@ -60,11 +63,15 @@ QSharedMemoryPrivate::QSharedMemoryPrivate()
#ifndef QT_NO_SYSTEMSEMAPHORE
systemSemaphore(QString()), lockedByMe(false),
#endif
+#ifndef QT_POSIX_IPC
unix_key(0)
+#else
+ hand(-1)
+#endif
{
}
-void QSharedMemoryPrivate::setErrorString(const QString &function)
+void QSharedMemoryPrivate::setErrorString(QLatin1String function)
{
// EINVAL is handled in functions so they can give better error strings
switch (errno) {
@@ -95,196 +102,6 @@ void QSharedMemoryPrivate::setErrorString(const QString &function)
}
}
-/*!
- \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(QLatin1String("QSharedMemory::handle:"));
- 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(QLatin1String("QSharedMemory::handle:"));
- error = QSharedMemory::NotFound;
- return 0;
- }
-
- unix_key = ftok(QFile::encodeName(nativeKey).constData(), 'Q');
- if (-1 == unix_key) {
- errorString = QSharedMemory::tr("%1: ftok failed").arg(QLatin1String("QSharedMemory::handle:"));
- 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 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(int size)
-{
- // build file if needed
- bool createdFile = false;
- int built = createUnixKeyFile(nativeKey);
- if (built == -1) {
- errorString = QSharedMemory::tr("%1: unable to make key").arg(QLatin1String("QSharedMemory::handle:"));
- 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, 0600 | IPC_CREAT | IPC_EXCL)) {
- QString function = QLatin1String("QSharedMemory::create");
- switch (errno) {
- case EINVAL:
- errorString = QSharedMemory::tr("%1: system-imposed size restrictions").arg(QLatin1String("QSharedMemory::handle"));
- 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(QLatin1String("QSharedMemory::attach (shmget)"));
- return false;
- }
-
- // grab the memory
- memory = shmat(id, 0, (mode == QSharedMemory::ReadOnly ? SHM_RDONLY : 0));
- if ((void*) - 1 == memory) {
- memory = 0;
- setErrorString(QLatin1String("QSharedMemory::attach (shmat)"));
- return false;
- }
-
- // grab the size
- shmid_ds shmid_ds;
- if (!shmctl(id, IPC_STAT, &shmid_ds)) {
- size = (int)shmid_ds.shm_segsz;
- } else {
- setErrorString(QLatin1String("QSharedMemory::attach (shmctl)"));
- return false;
- }
-
- return true;
-}
-
-bool QSharedMemoryPrivate::detach()
-{
- // detach from the memory segment
- if (-1 == shmdt(memory)) {
- QString function = QLatin1String("QSharedMemory::detach");
- switch (errno) {
- case EINVAL:
- errorString = QSharedMemory::tr("%1: not attached").arg(function);
- error = QSharedMemory::NotFound;
- break;
- default:
- setErrorString(function);
- }
- return false;
- }
- memory = 0;
- 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(QLatin1String("QSharedMemory::remove"));
- 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
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-09 03:05:06 +0000