'QSharedMemory mapped file always have zero length

When the QSharedMemory example is running, a mapped file is created into /tmp directory.

$ ls -s /tmp/*Example*
0 /tmp/qipc_sharedmemory_QSharedMemoryExampleff77196351dd7c1c8f79461ad32f21726fe31f5b
0 /tmp/qipc_systemsem_QSharedMemoryExampleff77196351dd7c1c8f79461ad32f21726fe31f5b

All works fine, but the file always have zero length. I tried using setNativeKey() but the result is the same.

When I use shm_open/ftruncate/mmap functions from C, the mapped file have the file size indicate in ftruncate() parameter.

Is this the expected behavior?

qtqt5shared-memoryqsharedmemory


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