--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/auto/qsharedmemory/src/qsystemlock_unix.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,233 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#include "qsystemlock.h"
+#include "qsystemlock_p.h"
+
+#include <qdebug.h>
+#include <qfile.h>
+
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/shm.h>
+#include <unistd.h>
+
+#include <sys/sem.h>
+// We have to define this as on some sem.h will have it
+union qt_semun {
+ int val; /* value for SETVAL */
+ struct semid_ds *buf; /* buffer for IPC_STAT, IPC_SET */
+ unsigned short *array; /* array for GETALL, SETALL */
+};
+
+#define tr(x) QT_TRANSLATE_NOOP(QLatin1String("QSystemLock"), (x))
+
+#if defined(Q_OS_SYMBIAN)
+int createUnixKeyFile(const QString &fileName)
+{
+ if (QFile::exists(fileName))
+ return 0;
+
+ int fd = 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
+
+QSystemLockPrivate::QSystemLockPrivate() :
+ semaphore(-1), lockCount(0),
+ error(QSystemLock::NoError), unix_key(-1), createdFile(false), createdSemaphore(false)
+{
+}
+
+void QSystemLockPrivate::setErrorString(const QString &function)
+{
+ switch (errno) {
+ case EIDRM:
+ errorString = function + QLatin1String(": ") + tr("The semaphore set was removed");
+ error = QSystemLock::UnknownError;
+ break;
+ default:
+ errorString = function + QLatin1String(": ") + tr("unknown error");
+ error = QSystemLock::UnknownError;
+ qWarning() << errorString << "key" << key << "errno" << errno << ERANGE << ENOMEM << EINVAL << EINTR << EFBIG << EFAULT << EAGAIN << EACCES << E2BIG;
+ }
+}
+
+/*!
+ \internal
+
+ Setup unix_key
+ */
+key_t QSystemLockPrivate::handle()
+{
+ if (key.isEmpty())
+ return -1;
+
+ // ftok requires that an actual file exists somewhere
+ // If we have already made at some point in the past,
+ // double check that it is still there.
+ if (-1 != unix_key) {
+ int aNewunix_key = ftok(QFile::encodeName(fileName).constData(), 'Q');
+ if (aNewunix_key != unix_key) {
+ cleanHandle();
+ } else {
+ return unix_key;
+ }
+ }
+
+ // Create the file needed for ftok
+#if defined(Q_OS_SYMBIAN)
+ int built = createUnixKeyFile(fileName);
+#else
+ int built = QSharedMemoryPrivate::createUnixKeyFile(fileName);
+#endif
+ if (-1 == built)
+ return -1;
+ createdFile = (1 == built);
+
+ // Get the unix key for the created file
+ unix_key = ftok(QFile::encodeName(fileName).constData(), 'Q');
+ if (-1 == unix_key) {
+ setErrorString(QLatin1String("QSystemLock::handle ftok"));
+ return -1;
+ }
+
+ // Get semaphore
+ semaphore = semget(unix_key, 1, 0666 | IPC_CREAT | IPC_EXCL);
+ if (-1 == semaphore) {
+ if (errno == EEXIST)
+ semaphore = semget(unix_key, 1, 0666 | IPC_CREAT);
+ if (-1 == semaphore) {
+ setErrorString(QLatin1String("QSystemLock::handle semget"));
+ cleanHandle();
+ return -1;
+ }
+ } else {
+ // Created semaphore, initialize value.
+ createdSemaphore = true;
+ qt_semun init_op;
+ init_op.val = MAX_LOCKS;
+ if (-1 == semctl(semaphore, 0, SETVAL, init_op)) {
+ setErrorString(QLatin1String("QSystemLock::handle semctl"));
+ cleanHandle();
+ return -1;
+ }
+ }
+
+ return unix_key;
+}
+
+/*!
+ \internal
+
+ Cleanup the unix_key
+ */
+void QSystemLockPrivate::cleanHandle()
+{
+ unix_key = -1;
+
+ // remove the file if we made it
+ if (createdFile) {
+ if (!QFile::remove(fileName))
+ setErrorString(QLatin1String("QSystemLock::cleanHandle QFile::remove"));
+ createdFile = false;
+ }
+
+ if (createdSemaphore) {
+ if (-1 != semaphore) {
+ if (-1 == semctl(semaphore, 0, IPC_RMID)) {
+ setErrorString(QLatin1String("QSystemLock::cleanHandle semctl"));
+ }
+ semaphore = -1;
+ }
+ createdSemaphore = false;
+ }
+}
+
+/*!
+ \internal
+
+ modifySemaphore generates operation.sem_op and handles recursive behavior.
+ */
+bool QSystemLockPrivate::modifySemaphore(QSystemLockPrivate::Operation op,
+ QSystemLock::LockMode mode)
+{
+ if (-1 == handle())
+ return false;
+
+ if ((lockCount == 0 && op == Lock) || (lockCount > 0 && op == Unlock)) {
+ if (op == Unlock) {
+ --lockCount;
+ Q_ASSERT(lockCount >= 0);
+ if (lockCount > 0)
+ return true;
+ }
+
+ struct sembuf operation;
+ operation.sem_num = 0;
+ operation.sem_op = (mode == QSystemLock::ReadWrite) ? MAX_LOCKS : 1;
+ if (op == Lock)
+ operation.sem_op *= -1;
+ operation.sem_flg = SEM_UNDO;
+
+ if (-1 == semop(semaphore, &operation, 1)) {
+ setErrorString(QLatin1String("QSystemLock::modify"));
+ return false;
+ }
+ lockedMode = mode;
+ }
+ if (op == Lock)
+ lockCount++;
+
+ return true;
+}
+