diff options
Diffstat (limited to 'src/corelib/kernel/qsystemsemaphore_unix.cpp')
| -rw-r--r-- | src/corelib/kernel/qsystemsemaphore_unix.cpp | 164 |
1 files changed, 15 insertions, 149 deletions
diff --git a/src/corelib/kernel/qsystemsemaphore_unix.cpp b/src/corelib/kernel/qsystemsemaphore_unix.cpp index 3d0cc76804..d1ec39ea40 100644 --- a/src/corelib/kernel/qsystemsemaphore_unix.cpp +++ b/src/corelib/kernel/qsystemsemaphore_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. ** ** $QT_END_LICENSE$ @@ -35,30 +35,29 @@ #include "qsystemsemaphore_p.h" #include <qdebug.h> -#include <qfile.h> #include <qcoreapplication.h> #ifndef QT_NO_SYSTEMSEMAPHORE #include <sys/types.h> +#ifndef QT_POSIX_IPC #include <sys/ipc.h> #include <sys/sem.h> +#endif #include <fcntl.h> #include <errno.h> #include "private/qcore_unix_p.h" -// OpenBSD 4.2 doesn't define EIDRM, see BUGS section: -// http://www.openbsd.org/cgi-bin/man.cgi?query=semop&manpath=OpenBSD+4.2 -#if defined(Q_OS_OPENBSD) && !defined(EIDRM) -#define EIDRM EINVAL -#endif - QT_BEGIN_NAMESPACE QSystemSemaphorePrivate::QSystemSemaphorePrivate() : - semaphore(-1), createdFile(false), - createdSemaphore(false), unix_key(-1), error(QSystemSemaphore::NoError) +#ifndef QT_POSIX_IPC + unix_key(-1), semaphore(-1), createdFile(false), +#else + semaphore(SEM_FAILED), +#endif // QT_POSIX_IPC + createdSemaphore(false), error(QSystemSemaphore::NoError) { } @@ -93,139 +92,6 @@ void QSystemSemaphorePrivate::setErrorString(const QString &function) } } -/*! - \internal - - Setup unix_key - */ -key_t QSystemSemaphorePrivate::handle(QSystemSemaphore::AccessMode mode) -{ - if (key.isEmpty()){ - errorString = QCoreApplication::tr("%1: key is empty", "QSystemSemaphore").arg(QLatin1String("QSystemSemaphore::handle:")); - error = QSystemSemaphore::KeyError; - return -1; - } - - // ftok requires that an actual file exists somewhere - if (-1 != unix_key) - return unix_key; - - // Create the file needed for ftok - int built = QSharedMemoryPrivate::createUnixKeyFile(fileName); - if (-1 == built) { - errorString = QCoreApplication::tr("%1: unable to make key", "QSystemSemaphore").arg(QLatin1String("QSystemSemaphore::handle:")); - error = QSystemSemaphore::KeyError; - 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) { - errorString = QCoreApplication::tr("%1: ftok failed", "QSystemSemaphore").arg(QLatin1String("QSystemSemaphore::handle:")); - error = QSystemSemaphore::KeyError; - return -1; - } - - // Get semaphore - semaphore = semget(unix_key, 1, 0600 | IPC_CREAT | IPC_EXCL); - if (-1 == semaphore) { - if (errno == EEXIST) - semaphore = semget(unix_key, 1, 0600 | IPC_CREAT); - if (-1 == semaphore) { - setErrorString(QLatin1String("QSystemSemaphore::handle")); - cleanHandle(); - return -1; - } - } else { - createdSemaphore = true; - // Force cleanup of file, it is possible that it can be left over from a crash - createdFile = true; - } - - if (mode == QSystemSemaphore::Create) { - createdSemaphore = true; - createdFile = true; - } - - // Created semaphore so initialize its value. - if (createdSemaphore && initialValue >= 0) { - qt_semun init_op; - init_op.val = initialValue; - if (-1 == semctl(semaphore, 0, SETVAL, init_op)) { - setErrorString(QLatin1String("QSystemSemaphore::handle")); - cleanHandle(); - return -1; - } - } - - return unix_key; -} - -/*! - \internal - - Cleanup the unix_key - */ -void QSystemSemaphorePrivate::cleanHandle() -{ - unix_key = -1; - - // remove the file if we made it - if (createdFile) { - QFile::remove(fileName); - createdFile = false; - } - - if (createdSemaphore) { - if (-1 != semaphore) { - if (-1 == semctl(semaphore, 0, IPC_RMID, 0)) { - setErrorString(QLatin1String("QSystemSemaphore::cleanHandle")); -#if defined QSYSTEMSEMAPHORE_DEBUG - qDebug() << QLatin1String("QSystemSemaphore::cleanHandle semctl failed."); -#endif - } - semaphore = -1; - } - createdSemaphore = false; - } -} - -/*! - \internal - */ -bool QSystemSemaphorePrivate::modifySemaphore(int count) -{ - if (-1 == handle()) - return false; - - struct sembuf operation; - operation.sem_num = 0; - operation.sem_op = count; - operation.sem_flg = SEM_UNDO; - - int res; - EINTR_LOOP(res, semop(semaphore, &operation, 1)); - if (-1 == res) { - // If the semaphore was removed be nice and create it and then modifySemaphore again - if (errno == EINVAL || errno == EIDRM) { - semaphore = -1; - cleanHandle(); - handle(); - return modifySemaphore(count); - } - setErrorString(QLatin1String("QSystemSemaphore::modifySemaphore")); -#if defined QSYSTEMSEMAPHORE_DEBUG - qDebug() << QLatin1String("QSystemSemaphore::modify failed") << count << semctl(semaphore, 0, GETVAL) << errno << EIDRM << EINVAL; -#endif - return false; - } - - clearError(); - return true; -} - - QT_END_NAMESPACE #endif // QT_NO_SYSTEMSEMAPHORE |