Qt Embedded 4.8.5 cannot open display lock

qtsri

We are running a Qt Embedded 4.8.5 application on Android 9 OSP and seeing this error:

QLock::QLock: Cannot create semaphore /tmp/qtembedded-0/QtEmbedded-0 'd' (38, Function not implemented)
Cannot get display lock
Aborted

despite enabling SYSVIPC in the underlying Linux kernel.

SGaist

Hi,

Did you implement the code as well in Qt ?
By the way, if your are locked to Qt 4, at least consider using the latest version of that series.

qtsri

Hi.
Yes, the code is implemented using Qt 4.8.5. We can try with 4.8.7. Thanks.

qtsri

We didn't have to upgrade to Qt 4.8.7 as were using the Android 9 kernel that doesn't use System V IPC where we assumed we were using Linux kernel with system V enabled. Pointing to the correct kernel in the build fixed the issue.

SGaist

Nice !

Note that the upgrade is still a good idea since you are using an outdated version of Qt. Even more, it has reached end of life a long time ago.