Resource temporarily unavailable

[huseyinkozan]

Hi,

I am using module with QSerialPort at Qt 5.12 on Manjaro.

After open, there is no error. But after write(), QSerialPort returns Resource temporarily unavailable error, and closes.

I am opening /dev/tnt0 and there is no opened on the other side. I need to write without connection. Trying to implement a virtual electronics device. There is a gui which tries to connect with timer on the other side.

After some search, Resource temporarily unavailable is related with EAGAIN, I think. But I couldn't find at module c file. Specially write function.

I tried with kernels; 5.10, 5.15, 5.19.

At some trials my virtual device and gui connected. But not all the times.

How can I fix this error ?

• Manjaro PKGBUILD file; https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=tty0tty-dkms-git
• Related Qt question; https://forum.qt.io/topic/59425/solved-qserialport-strange-difference-from-win-to-linux/4
• QSerialPort docs ; https://doc.qt.io/qt-5/qserialport.html#details
• Params; Baud=38400, DataBits=Data8, Parity=NoParity, SoptBits=OneStop, Flow=NoFlowControl

Edit1;

• Complete the question.
• Added tried kernel versions.

[huseyinkozan]

After upgrade to Qt 5.15 and kernel 6.1.31, didn't get the error. I am able to connect the softwares.

Got same error with kernel versions 6.3.5 and 6.4.0rc2.