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qdbusunixfiledescriptor.cpp

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1/****************************************************************************-
2**-
3** Copyright (C) 2016 The Qt Company Ltd.-
4** Contact: https://www.qt.io/licensing/-
5**-
6** This file is part of the QtDBus module of the Qt Toolkit.-
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38****************************************************************************/-
39-
40-
41#include "qdbusunixfiledescriptor.h"-
42-
43#ifdef Q_OS_UNIX-
44# include <private/qcore_unix_p.h>-
45#endif-
46-
47QT_BEGIN_NAMESPACE-
48-
49#ifndef QT_NO_DBUS-
50-
51/*!-
52 \class QDBusUnixFileDescriptor-
53 \inmodule QtDBus-
54 \ingroup shared-
55 \since 4.8-
56-
57 \brief The QDBusUnixFileDescriptor class holds one Unix file descriptor.-
58-
59 The QDBusUnixFileDescriptor class is used to hold one Unix file-
60 descriptor for use with the Qt D-Bus module. This allows applications to-
61 send and receive Unix file descriptors over the D-Bus connection, mapping-
62 automatically to the D-Bus type 'h'.-
63-
64 Objects of type QDBusUnixFileDescriptors can be used also as parameters-
65 in signals and slots that get exported to D-Bus by registering with-
66 QDBusConnection::registerObject.-
67-
68 QDBusUnixFileDescriptor does not take ownership of the file descriptor.-
69 Instead, it will use the Unix system call \c dup(2) to make a copy of the-
70 file descriptor. This file descriptor belongs to the-
71 QDBusUnixFileDescriptor object and should not be stored or closed by the-
72 user. Instead, you should make your own copy if you need that.-
73-
74 \section2 Availability-
75-
76 Unix file descriptor passing is not available in all D-Bus connections.-
77 This feature is present with D-Bus library and bus daemon version 1.4 and-
78 upwards on Unix systems. Qt D-Bus automatically enables the feature if such-
79 a version was found at compile-time and run-time.-
80-
81 To verify that your connection does support passing file descriptors,-
82 check if the QDBusConnection::UnixFileDescriptorPassing capability is set-
83 with QDBusConnection::connectionCapabilities(). If the flag is not-
84 active, then you will not be able to make calls to methods that have-
85 QDBusUnixFileDescriptor as arguments or even embed such a type in a-
86 variant. You will also not receive calls containing that type.-
87-
88 Note also that remote applications may not have support for Unix file-
89 descriptor passing. If you make a D-Bus to a remote application that-
90 cannot receive such a type, you will receive an error reply. If you try-
91 to send a signal containing a D-Bus file descriptor or return one from a-
92 method call, the message will be silently dropped.-
93-
94 Even if the feature is not available, QDBusUnixFileDescriptor will-
95 continue to operate, so code need not have compile-time checks for the-
96 availability of this feature.-
97-
98 On non-Unix systems, QDBusUnixFileDescriptor will always report an-
99 invalid state and QDBusUnixFileDescriptor::isSupported() will return-
100 false.-
101-
102 \sa QDBusConnection::ConnectionCapabilities, QDBusConnection::connectionCapabilities()-
103*/-
104-
105/*!-
106 \typedef QDBusUnixFileDescriptor::Data-
107 \internal-
108*/-
109-
110/*!-
111 \variable QDBusUnixFileDescriptor::d-
112 \internal-
113*/-
114-
115class QDBusUnixFileDescriptorPrivate : public QSharedData {-
116public:-
117 QDBusUnixFileDescriptorPrivate() : fd(-1) { }
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118 QDBusUnixFileDescriptorPrivate(const QDBusUnixFileDescriptorPrivate &other)-
119 : QSharedData(other), fd(-1)-
120 { }
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121 ~QDBusUnixFileDescriptorPrivate();-
122-
123 QAtomicInt fd;-
124};-
125-
126template<> inline-
127QExplicitlySharedDataPointer<QDBusUnixFileDescriptorPrivate>::~QExplicitlySharedDataPointer()-
128{
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dDescription
TRUEevaluated 94 times by 1 test
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FALSEevaluated 10 times by 1 test
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!d->ref.deref()Description
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FALSEevaluated 70 times by 1 test
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 if (d && !d->ref.deref()) delete d; }
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dDescription
TRUEevaluated 94 times by 1 test
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FALSEevaluated 10 times by 1 test
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!d->ref.deref()Description
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FALSEevaluated 70 times by 1 test
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10-104
129-
130/*!-
131 Constructs a QDBusUnixFileDescriptor without a wrapped file descriptor.-
132 This is equivalent to constructing the object with an invalid file-
133 descriptor (like -1).-
134-
135 \sa fileDescriptor(), isValid()-
136*/-
137QDBusUnixFileDescriptor::QDBusUnixFileDescriptor()-
138 : d(0)-
139{-
140}
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141-
142/*!-
143 Constructs a QDBusUnixFileDescriptor object by copying the \a-
144 fileDescriptor parameter. The original file descriptor is not touched and-
145 must be closed by the user.-
146-
147 Note that the value returned by fileDescriptor() will be different from-
148 the \a fileDescriptor parameter passed.-
149-
150 If the \a fileDescriptor parameter is not valid, isValid() will return-
151 false and fileDescriptor() will return -1.-
152-
153 \sa setFileDescriptor(), fileDescriptor()-
154*/-
155QDBusUnixFileDescriptor::QDBusUnixFileDescriptor(int fileDescriptor)-
156 : d(0)-
157{-
158 if (fileDescriptor != -1)
fileDescriptor != -1Description
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FALSEevaluated 1 time by 1 test
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159 setFileDescriptor(fileDescriptor);
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160}
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161-
162/*!-
163 Constructs a QDBusUnixFileDescriptor object by copying \a other.-
164*/-
165QDBusUnixFileDescriptor::QDBusUnixFileDescriptor(const QDBusUnixFileDescriptor &other)-
166 : d(other.d)-
167{-
168}
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169-
170/*!-
171 Copies the Unix file descriptor from the \a other QDBusUnixFileDescriptor-
172 object. If the current object contained a file descriptor, it will be-
173 properly disposed of before.-
174*/-
175QDBusUnixFileDescriptor &QDBusUnixFileDescriptor::operator=(const QDBusUnixFileDescriptor &other)-
176{-
177 if (this != &other)
this != &otherDescription
TRUEnever evaluated
FALSEnever evaluated
0
178 d.operator=(other.d);
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0
179 return *this;
never executed: return *this;
0
180}-
181-
182/*!-
183 \fn QDBusUnixFileDescriptor &QDBusUnixFileDescriptor::operator=(QDBusUnixFileDescriptor &&other)-
184-
185 Move-assigns \a other to this QDBusUnixFileDescriptor.-
186*/-
187-
188/*!-
189 Destroys this QDBusUnixFileDescriptor object and disposes of the Unix file descriptor that it contained.-
190*/-
191QDBusUnixFileDescriptor::~QDBusUnixFileDescriptor()-
192{-
193}-
194-
195/*!-
196 \fn void QDBusUnixFileDescriptor::swap(QDBusUnixFileDescriptor &other)-
197 \since 5.0-
198-
199 Swaps this file descriptor instance with \a other. This function-
200 is very fast and never fails.-
201*/-
202-
203/*!-
204 Returns \c true if this Unix file descriptor is valid. A valid Unix file-
205 descriptor is not -1.-
206-
207 \sa fileDescriptor()-
208*/-
209bool QDBusUnixFileDescriptor::isValid() const-
210{-
211 return d ? d->fd.load() != -1 : false;
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212}-
213-
214/*!-
215 Returns the Unix file descriptor contained by this-
216 QDBusUnixFileDescriptor object. An invalid file descriptor is represented-
217 by the value -1.-
218-
219 Note that the file descriptor returned by this function is owned by the-
220 QDBusUnixFileDescriptor object and must not be stored past the lifetime-
221 of this object. It is ok to use it while this object is valid, but if one-
222 wants to store it for longer use, the file descriptor should be cloned-
223 using the Unix \c dup(2), \c dup2(2) or \c dup3(2) functions.-
224-
225 \sa isValid()-
226*/-
227int QDBusUnixFileDescriptor::fileDescriptor() const-
228{-
229 return d ? d->fd.load() : -1;
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230}-
231-
232// actual implementation-
233#ifdef Q_OS_UNIX-
234-
235// qdoc documentation is generated on Unix-
236-
237/*!-
238 Returns \c true if Unix file descriptors are supported on this platform. In-
239 other words, this function returns \c true if this is a Unix platform.-
240-
241 Note that QDBusUnixFileDescriptor continues to operate even if this-
242 function returns \c false. The only difference is that the-
243 QDBusUnixFileDescriptor objects will always be in the isValid() == false-
244 state and fileDescriptor() will always return -1. The class will not-
245 consume any operating system resources.-
246*/-
247bool QDBusUnixFileDescriptor::isSupported()-
248{-
249 return true;
never executed: return true;
0
250}-
251-
252/*!-
253 Sets the file descriptor that this QDBusUnixFileDescriptor object holds-
254 to a copy of \a fileDescriptor. The original file descriptor is not-
255 touched and must be closed by the user.-
256-
257 Note that the value returned by fileDescriptor() will be different from-
258 the \a fileDescriptor parameter passed.-
259-
260 If the \a fileDescriptor parameter is not valid, isValid() will return-
261 false and fileDescriptor() will return -1.-
262-
263 \sa isValid(), fileDescriptor()-
264*/-
265void QDBusUnixFileDescriptor::setFileDescriptor(int fileDescriptor)-
266{-
267 if (fileDescriptor != -1)
fileDescriptor != -1Description
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268 giveFileDescriptor(qt_safe_dup(fileDescriptor));
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269}
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270-
271/*!-
272 \internal-
273 Sets the Unix file descriptor to \a fileDescriptor without copying.-
274-
275 \sa setFileDescriptor()-
276*/-
277void QDBusUnixFileDescriptor::giveFileDescriptor(int fileDescriptor)-
278{-
279 // if we are the sole ref, d remains unchanged-
280 // if detaching happens, d->fd will be -1-
281 if (d)
dDescription
TRUEnever evaluated
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282 d.detach();
never executed: d.detach();
0
283 else-
284 d = new QDBusUnixFileDescriptorPrivate;
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285-
286 const int fdl = d->fd.load();-
287 if (fdl != -1)
fdl != -1Description
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288 qt_safe_close(fdl);
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289-
290 if (fileDescriptor != -1)
fileDescriptor != -1Description
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291 d->fd.store(fileDescriptor);
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292}
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293-
294/*!-
295 \internal-
296 Extracts the Unix file descriptor from the QDBusUnixFileDescriptor object-
297 and transfers ownership.-
298-
299 Note: since QDBusUnixFileDescriptor is implicitly shared, this function-
300 is inherently racy and should be avoided.-
301*/-
302int QDBusUnixFileDescriptor::takeFileDescriptor()-
303{-
304 if (!d)
!dDescription
TRUEnever evaluated
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0
305 return -1;
never executed: return -1;
0
306-
307 return d->fd.fetchAndStoreRelaxed(-1);
never executed: return d->fd.fetchAndStoreRelaxed(-1);
0
308}-
309-
310QDBusUnixFileDescriptorPrivate::~QDBusUnixFileDescriptorPrivate()-
311{-
312 const int fdl = fd.load();-
313 if (fdl != -1)
fdl != -1Description
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314 qt_safe_close(fdl);
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315}
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316-
317#else-
318bool QDBusUnixFileDescriptor::isSupported()-
319{-
320 return false;-
321}-
322-
323void QDBusUnixFileDescriptor::setFileDescriptor(int)-
324{-
325}-
326-
327void QDBusUnixFileDescriptor::giveFileDescriptor(int)-
328{-
329}-
330-
331int QDBusUnixFileDescriptor::takeFileDescriptor()-
332{-
333 return -1;-
334}-
335-
336QDBusUnixFileDescriptorPrivate::~QDBusUnixFileDescriptorPrivate()-
337{-
338}-
339-
340#endif-
341-
342#endif // QT_NO_DBUS-
343-
344QT_END_NAMESPACE-
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