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IPC: make the two platformSafeKey functions return QNativeIpcKey

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There's no need to return QString, only to create the QNativeIpcKey
elsewhere, when nothing uses this intermediary QString (those two
functions aren't used in unit tests any more, since the two "IPC: add
native key support" commits (2c286561bb
and 3ae052d3bb). Since they aren't used in
the tests, we can remove the Q_AUTOTEST_EXPORT macro too and the
unnecessary default argument.

I'll need the ability to return QNativeIpcKey to store the original,
legacy key inside of it.

Pick-to: 6.6 6.6.0
Change-Id: Idd5e1bb52be047d7b4fffffd17506c05e4f61f79
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
This commit is contained in:
Thiago Macieira 2023-03-27 17:57:13 -06:00
parent b2e5f70490
commit b5584ed224
4 changed files with 51 additions and 45 deletions
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4
src/corelib/ipc/qsharedmemory.cpp
View File

@ -686,12 +686,12 @@ bool QSharedMemory::isKeyTypeSupported(QNativeIpcKey::Type type)
QNativeIpcKey QSharedMemory::platformSafeKey(const QString &key, QNativeIpcKey::Type type)
{
return { QtIpcCommon::platformSafeKey(key, IpcType::SharedMemory, type), type };
return QtIpcCommon::platformSafeKey(key, IpcType::SharedMemory, type);
}
QNativeIpcKey QSharedMemory::legacyNativeKey(const QString &key, QNativeIpcKey::Type type)
{
return { legacyPlatformSafeKey(key, IpcType::SharedMemory, type), type };
return QtIpcCommon::legacyPlatformSafeKey(key, IpcType::SharedMemory, type);
}
#endif // QT_CONFIG(sharedmemory)

4
src/corelib/ipc/qsystemsemaphore.cpp
View File

@ -406,12 +406,12 @@ bool QSystemSemaphore::isKeyTypeSupported(QNativeIpcKey::Type type)
QNativeIpcKey QSystemSemaphore::platformSafeKey(const QString &key, QNativeIpcKey::Type type)
{
return { QtIpcCommon::platformSafeKey(key, IpcType::SystemSemaphore, type), type };
return QtIpcCommon::platformSafeKey(key, IpcType::SystemSemaphore, type);
}
QNativeIpcKey QSystemSemaphore::legacyNativeKey(const QString &key, QNativeIpcKey::Type type)
{
return { legacyPlatformSafeKey(key, IpcType::SystemSemaphore, type), type };
return QtIpcCommon::legacyPlatformSafeKey(key, IpcType::SystemSemaphore, type);
}
QT_END_NAMESPACE

82
src/corelib/ipc/qtipccommon.cpp
View File

@ -98,11 +98,12 @@ static QNativeIpcKey::Type stringToType(QStringView typeString)
On Unix this will be a file name
*/
QString QtIpcCommon::legacyPlatformSafeKey(const QString &key, QtIpcCommon::IpcType ipcType,
QNativeIpcKey::Type type)
QNativeIpcKey QtIpcCommon::legacyPlatformSafeKey(const QString &key, QtIpcCommon::IpcType ipcType,
QNativeIpcKey::Type type)
{
QNativeIpcKey k(type);
if (key.isEmpty())
return QString();
return k;
QByteArray hex = QCryptographicHash::hash(key.toUtf8(), QCryptographicHash::Sha1).toHex();
@ -113,13 +114,15 @@ QString QtIpcCommon::legacyPlatformSafeKey(const QString &key, QtIpcCommon::IpcT
// to be in the form <application group identifier>/<custom identifier>.
// Since we don't know which application group identifier the user wants
// to apply, we instead document that requirement, and use the key directly.
return key;
k.setNativeKey(key);
} else {
// The shared memory name limit on Apple platforms is very low (30 characters),
// so we can't use the logic below of combining the prefix, key, and a hash,
// to ensure a unique and valid name. Instead we use the first part of the
// hash, which should still long enough to avoid collisions in practice.
k.setNativeKey(u'/' + QLatin1StringView(hex).left(SHM_NAME_MAX - 1));
}
// The shared memory name limit on Apple platforms is very low (30 characters),
// so we can't use the logic below of combining the prefix, key, and a hash,
// to ensure a unique and valid name. Instead we use the first part of the
// hash, which should still long enough to avoid collisions in practice.
return u'/' + QLatin1StringView(hex).left(SHM_NAME_MAX - 1);
return k;
#endif
}
@ -143,38 +146,41 @@ QString QtIpcCommon::legacyPlatformSafeKey(const QString &key, QtIpcCommon::IpcT
switch (type) {
case QNativeIpcKey::Type::Windows:
if (!isIpcSupported(ipcType, QNativeIpcKey::Type::Windows))
return QString();
return result;
if (isIpcSupported(ipcType, QNativeIpcKey::Type::Windows))
k.setNativeKey(result);
return k;
case QNativeIpcKey::Type::PosixRealtime:
if (!isIpcSupported(ipcType, QNativeIpcKey::Type::PosixRealtime))
return QString();
return result.prepend(u'/');
if (isIpcSupported(ipcType, QNativeIpcKey::Type::PosixRealtime))
k.setNativeKey(result.prepend(u'/'));
return k;
case QNativeIpcKey::Type::SystemV:
break;
}
if (!isIpcSupported(ipcType, QNativeIpcKey::Type::SystemV))
return QString();
return QStandardPaths::writableLocation(QStandardPaths::TempLocation) + u'/' + result;
if (isIpcSupported(ipcType, QNativeIpcKey::Type::SystemV))
k.setNativeKey(QStandardPaths::writableLocation(QStandardPaths::TempLocation) + u'/' + result);
return k;
}
QString QtIpcCommon::platformSafeKey(const QString &key, QtIpcCommon::IpcType ipcType,
QNativeIpcKey::Type type)
QNativeIpcKey QtIpcCommon::platformSafeKey(const QString &key, QtIpcCommon::IpcType ipcType,
QNativeIpcKey::Type type)
{
QNativeIpcKey k(type);
if (key.isEmpty())
return key;
return k;
switch (type) {
case QNativeIpcKey::Type::PosixRealtime:
if (!isIpcSupported(ipcType, QNativeIpcKey::Type::PosixRealtime))
return QString();
if (isIpcSupported(ipcType, QNativeIpcKey::Type::PosixRealtime)) {
#ifdef SHM_NAME_MAX
// The shared memory name limit on Apple platforms is very low (30
// characters), so we have to cut it down to avoid ENAMETOOLONG. We
// hope that there won't be too many collisions...
return u'/' + QStringView(key).left(SHM_NAME_MAX - 1);
// The shared memory name limit on Apple platforms is very low (30
// characters), so we have to cut it down to avoid ENAMETOOLONG. We
// hope that there won't be too many collisions...
k.setNativeKey(u'/' + QStringView(key).left(SHM_NAME_MAX - 1));
#else
k.setNativeKey(u'/' + key);
#endif
return u'/' + key;
}
return k;
case QNativeIpcKey::Type::Windows:
if (isIpcSupported(ipcType, QNativeIpcKey::Type::Windows)) {
@ -199,22 +205,24 @@ QString QtIpcCommon::platformSafeKey(const QString &key, QtIpcCommon::IpcType ip
#ifdef Q_OS_WINDOWS
result.truncate(MAX_PATH);
#endif
return result;
k.setNativeKey(result);
}
return QString();
return k;
case QNativeIpcKey::Type::SystemV:
break;
}
// System V
if (!isIpcSupported(ipcType, QNativeIpcKey::Type::SystemV))
return QString();
if (key.startsWith(u'/'))
return key;
QString baseDir = QStandardPaths::writableLocation(QStandardPaths::RuntimeLocation);
return baseDir + u'/' + key;
if (isIpcSupported(ipcType, QNativeIpcKey::Type::SystemV)) {
if (key.startsWith(u'/')) {
k.setNativeKey(key);
} else {
QString baseDir = QStandardPaths::writableLocation(QStandardPaths::RuntimeLocation);
k.setNativeKey(baseDir + u'/' + key);
}
}
return k;
}
/*!

6
src/corelib/ipc/qtipccommon_p.h
View File

@ -136,10 +136,8 @@ public:
}
};
Q_AUTOTEST_EXPORT QString
legacyPlatformSafeKey(const QString &key, IpcType ipcType,
QNativeIpcKey::Type type = QNativeIpcKey::legacyDefaultTypeForOs());
Q_AUTOTEST_EXPORT QString platformSafeKey(const QString &key, IpcType ipcType, QNativeIpcKey::Type type);
QNativeIpcKey legacyPlatformSafeKey(const QString &key, IpcType ipcType, QNativeIpcKey::Type type);
QNativeIpcKey platformSafeKey(const QString &key, IpcType ipcType, QNativeIpcKey::Type type);
#ifdef Q_OS_UNIX
// Convenience function to create the file if needed