Message ID | 20190428231238.30547-1-laurent.pinchart@ideasonboard.com |
---|---|
State | Accepted |
Headers | show |
Series |
|
Related | show |
HI Laurent, On Mon, Apr 29, 2019 at 02:12:37AM +0300, Laurent Pinchart wrote: > The glibc read() and write() functions are defined with the > __warn_unused_result__ attribute when using FORTIFY_SOURCE. Don't ignore > their return value. > Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> > Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > --- > src/libcamera/event_dispatcher_poll.cpp | 8 ++++++-- > test/event.cpp | 13 +++++++++++-- > 2 files changed, 17 insertions(+), 4 deletions(-) > > diff --git a/src/libcamera/event_dispatcher_poll.cpp b/src/libcamera/event_dispatcher_poll.cpp > index 1f0f352a8e0a..2621b7d96b1e 100644 > --- a/src/libcamera/event_dispatcher_poll.cpp > +++ b/src/libcamera/event_dispatcher_poll.cpp > @@ -162,7 +162,9 @@ void EventDispatcherPoll::processEvents() > void EventDispatcherPoll::interrupt() > { > uint64_t value = 1; > - write(eventfd_, &value, sizeof(value)); > + ssize_t ret = write(eventfd_, &value, sizeof(value)); > + if (ret < 0) > + LOG(Event, Error) << "Failed to interrupt event dispatcher"; > } > > short EventDispatcherPoll::EventNotifierSetPoll::events() const > @@ -214,7 +216,9 @@ void EventDispatcherPoll::processInterrupt(const struct pollfd &pfd) > return; > > uint64_t value; > - read(eventfd_, &value, sizeof(value)); > + ssize_t ret = read(eventfd_, &value, sizeof(value)); > + if (ret < 0) > + LOG(Event, Error) << "Failed to process interrupt"; > } > > void EventDispatcherPoll::processNotifiers(const std::vector<struct pollfd> &pollfds) > diff --git a/test/event.cpp b/test/event.cpp > index 52bc0c7e77f5..9bd876153a18 100644 > --- a/test/event.cpp > +++ b/test/event.cpp > @@ -38,6 +38,7 @@ protected: > EventDispatcher *dispatcher = CameraManager::instance()->eventDispatcher(); > std::string data("H2G2"); > Timer timeout; > + ssize_t ret; > > EventNotifier readNotifier(pipefd_[0], EventNotifier::Read); > readNotifier.activated.connect(this, &EventTest::readReady); > @@ -46,7 +47,11 @@ protected: > memset(data_, 0, sizeof(data_)); > size_ = 0; > > - write(pipefd_[1], data.data(), data.size()); > + ret = write(pipefd_[1], data.data(), data.size()); > + if (ret < 0) { > + cout << "Pipe write failed" << endl; > + return TestFail; > + } > > timeout.start(100); > dispatcher->processEvents(); > @@ -73,7 +78,11 @@ protected: > notified_ = false; > readNotifier.setEnabled(false); > > - write(pipefd_[1], data.data(), data.size()); > + ret = write(pipefd_[1], data.data(), data.size()); > + if (ret < 0) { > + cout << "Pipe write failed" << endl; > + return TestFail; > + } > > timeout.start(100); > dispatcher->processEvents(); > -- > Regards, > > Laurent Pinchart > > _______________________________________________ > libcamera-devel mailing list > libcamera-devel@lists.libcamera.org > https://lists.libcamera.org/listinfo/libcamera-devel
Hi Laurent, On 29/04/2019 00:12, Laurent Pinchart wrote: > The glibc read() and write() functions are defined with the > __warn_unused_result__ attribute when using FORTIFY_SOURCE. Don't ignore > their return value. > > Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > --- > src/libcamera/event_dispatcher_poll.cpp | 8 ++++++-- > test/event.cpp | 13 +++++++++++-- > 2 files changed, 17 insertions(+), 4 deletions(-) > > diff --git a/src/libcamera/event_dispatcher_poll.cpp b/src/libcamera/event_dispatcher_poll.cpp > index 1f0f352a8e0a..2621b7d96b1e 100644 > --- a/src/libcamera/event_dispatcher_poll.cpp > +++ b/src/libcamera/event_dispatcher_poll.cpp > @@ -162,7 +162,9 @@ void EventDispatcherPoll::processEvents() > void EventDispatcherPoll::interrupt() > { > uint64_t value = 1; > - write(eventfd_, &value, sizeof(value)); > + ssize_t ret = write(eventfd_, &value, sizeof(value));> + if (ret < 0) Do we care if ret != sizeof(value)? (I think it must be highly unlikely that the read/write call doesn't at least read the 64 bit value...) > + LOG(Event, Error) << "Failed to interrupt event dispatcher"; What about printing the strerror(errno), as if this ever actually happens (even if unlikely) it would be useful... > } > > short EventDispatcherPoll::EventNotifierSetPoll::events() const > @@ -214,7 +216,9 @@ void EventDispatcherPoll::processInterrupt(const struct pollfd &pfd) > return; > > uint64_t value; > - read(eventfd_, &value, sizeof(value)); > + ssize_t ret = read(eventfd_, &value, sizeof(value)); > + if (ret < 0) > + LOG(Event, Error) << "Failed to process interrupt"; Same comments as above... Could we ever expect ret == 0 on the read call (EOF?)? I presume as we're checking with poll() in advance this should always have at least one event to read. I think the return values are probably fine, and the errno is optional so with or without updates: Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> > } > > void EventDispatcherPoll::processNotifiers(const std::vector<struct pollfd> &pollfds) > diff --git a/test/event.cpp b/test/event.cpp > index 52bc0c7e77f5..9bd876153a18 100644 > --- a/test/event.cpp > +++ b/test/event.cpp > @@ -38,6 +38,7 @@ protected: > EventDispatcher *dispatcher = CameraManager::instance()->eventDispatcher(); > std::string data("H2G2"); > Timer timeout; > + ssize_t ret; > > EventNotifier readNotifier(pipefd_[0], EventNotifier::Read); > readNotifier.activated.connect(this, &EventTest::readReady); > @@ -46,7 +47,11 @@ protected: > memset(data_, 0, sizeof(data_)); > size_ = 0; > > - write(pipefd_[1], data.data(), data.size()); > + ret = write(pipefd_[1], data.data(), data.size()); > + if (ret < 0) { > + cout << "Pipe write failed" << endl; > + return TestFail; > + } > > timeout.start(100); > dispatcher->processEvents(); > @@ -73,7 +78,11 @@ protected: > notified_ = false; > readNotifier.setEnabled(false); > > - write(pipefd_[1], data.data(), data.size()); > + ret = write(pipefd_[1], data.data(), data.size()); > + if (ret < 0) { > + cout << "Pipe write failed" << endl; > + return TestFail; > + } > > timeout.start(100); > dispatcher->processEvents(); >
Hi Kieran, On Mon, Apr 29, 2019 at 01:13:31PM +0100, Kieran Bingham wrote: > On 29/04/2019 00:12, Laurent Pinchart wrote: > > The glibc read() and write() functions are defined with the > > __warn_unused_result__ attribute when using FORTIFY_SOURCE. Don't ignore > > their return value. > > > > Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > > --- > > src/libcamera/event_dispatcher_poll.cpp | 8 ++++++-- > > test/event.cpp | 13 +++++++++++-- > > 2 files changed, 17 insertions(+), 4 deletions(-) > > > > diff --git a/src/libcamera/event_dispatcher_poll.cpp b/src/libcamera/event_dispatcher_poll.cpp > > index 1f0f352a8e0a..2621b7d96b1e 100644 > > --- a/src/libcamera/event_dispatcher_poll.cpp > > +++ b/src/libcamera/event_dispatcher_poll.cpp > > @@ -162,7 +162,9 @@ void EventDispatcherPoll::processEvents() > > void EventDispatcherPoll::interrupt() > > { > > uint64_t value = 1; > > - write(eventfd_, &value, sizeof(value)); > > + ssize_t ret = write(eventfd_, &value, sizeof(value));> + if (ret < 0) > > Do we care if ret != sizeof(value)? (I think it must be highly unlikely > that the read/write call doesn't at least read the 64 bit value...) > > > + LOG(Event, Error) << "Failed to interrupt event dispatcher"; > > What about printing the strerror(errno), as if this ever actually > happens (even if unlikely) it would be useful... Good point. I'll fix this. > > } > > > > short EventDispatcherPoll::EventNotifierSetPoll::events() const > > @@ -214,7 +216,9 @@ void EventDispatcherPoll::processInterrupt(const struct pollfd &pfd) > > return; > > > > uint64_t value; > > - read(eventfd_, &value, sizeof(value)); > > + ssize_t ret = read(eventfd_, &value, sizeof(value)); > > + if (ret < 0) > > + LOG(Event, Error) << "Failed to process interrupt"; > > Same comments as above... > > Could we ever expect ret == 0 on the read call (EOF?)? I presume as > we're checking with poll() in advance this should always have at least > one event to read. Yes, there should also be data to read. > I think the return values are probably fine, and the errno is optional > so with or without updates: > > Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> > > > } > > > > void EventDispatcherPoll::processNotifiers(const std::vector<struct pollfd> &pollfds) > > diff --git a/test/event.cpp b/test/event.cpp > > index 52bc0c7e77f5..9bd876153a18 100644 > > --- a/test/event.cpp > > +++ b/test/event.cpp > > @@ -38,6 +38,7 @@ protected: > > EventDispatcher *dispatcher = CameraManager::instance()->eventDispatcher(); > > std::string data("H2G2"); > > Timer timeout; > > + ssize_t ret; > > > > EventNotifier readNotifier(pipefd_[0], EventNotifier::Read); > > readNotifier.activated.connect(this, &EventTest::readReady); > > @@ -46,7 +47,11 @@ protected: > > memset(data_, 0, sizeof(data_)); > > size_ = 0; > > > > - write(pipefd_[1], data.data(), data.size()); > > + ret = write(pipefd_[1], data.data(), data.size()); > > + if (ret < 0) { > > + cout << "Pipe write failed" << endl; > > + return TestFail; > > + } > > > > timeout.start(100); > > dispatcher->processEvents(); > > @@ -73,7 +78,11 @@ protected: > > notified_ = false; > > readNotifier.setEnabled(false); > > > > - write(pipefd_[1], data.data(), data.size()); > > + ret = write(pipefd_[1], data.data(), data.size()); > > + if (ret < 0) { > > + cout << "Pipe write failed" << endl; > > + return TestFail; > > + } > > > > timeout.start(100); > > dispatcher->processEvents();
diff --git a/src/libcamera/event_dispatcher_poll.cpp b/src/libcamera/event_dispatcher_poll.cpp index 1f0f352a8e0a..2621b7d96b1e 100644 --- a/src/libcamera/event_dispatcher_poll.cpp +++ b/src/libcamera/event_dispatcher_poll.cpp @@ -162,7 +162,9 @@ void EventDispatcherPoll::processEvents() void EventDispatcherPoll::interrupt() { uint64_t value = 1; - write(eventfd_, &value, sizeof(value)); + ssize_t ret = write(eventfd_, &value, sizeof(value)); + if (ret < 0) + LOG(Event, Error) << "Failed to interrupt event dispatcher"; } short EventDispatcherPoll::EventNotifierSetPoll::events() const @@ -214,7 +216,9 @@ void EventDispatcherPoll::processInterrupt(const struct pollfd &pfd) return; uint64_t value; - read(eventfd_, &value, sizeof(value)); + ssize_t ret = read(eventfd_, &value, sizeof(value)); + if (ret < 0) + LOG(Event, Error) << "Failed to process interrupt"; } void EventDispatcherPoll::processNotifiers(const std::vector<struct pollfd> &pollfds) diff --git a/test/event.cpp b/test/event.cpp index 52bc0c7e77f5..9bd876153a18 100644 --- a/test/event.cpp +++ b/test/event.cpp @@ -38,6 +38,7 @@ protected: EventDispatcher *dispatcher = CameraManager::instance()->eventDispatcher(); std::string data("H2G2"); Timer timeout; + ssize_t ret; EventNotifier readNotifier(pipefd_[0], EventNotifier::Read); readNotifier.activated.connect(this, &EventTest::readReady); @@ -46,7 +47,11 @@ protected: memset(data_, 0, sizeof(data_)); size_ = 0; - write(pipefd_[1], data.data(), data.size()); + ret = write(pipefd_[1], data.data(), data.size()); + if (ret < 0) { + cout << "Pipe write failed" << endl; + return TestFail; + } timeout.start(100); dispatcher->processEvents(); @@ -73,7 +78,11 @@ protected: notified_ = false; readNotifier.setEnabled(false); - write(pipefd_[1], data.data(), data.size()); + ret = write(pipefd_[1], data.data(), data.size()); + if (ret < 0) { + cout << "Pipe write failed" << endl; + return TestFail; + } timeout.start(100); dispatcher->processEvents();
The glibc read() and write() functions are defined with the __warn_unused_result__ attribute when using FORTIFY_SOURCE. Don't ignore their return value. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> --- src/libcamera/event_dispatcher_poll.cpp | 8 ++++++-- test/event.cpp | 13 +++++++++++-- 2 files changed, 17 insertions(+), 4 deletions(-)