Hello pluggers,
I need to use DBus on a Raspberry Pi 3 running Raspbian Stretch to
synchronize the reading and writing of a PNG file.
One program writes the graphics file, the other program needs to read
it. File locking is cumbersome, how do you make
sure that the the writer gets a lock before the reader does? If only
the writer could talk to the reader before the
reader grabs the file. The writer should indicate whether or not the
file is ready to be read or maybe the file is still
being written. Maybe the camera is still snapping a picture. In
theory, if the programs communicate with each other there
is no need for file system level locks.
Problem, the 2005 Linux Journal article that shows a way to use DBus
does not compile. The original dbus is apparently
too low level and evidently it is deprecated. Ouch!
I'm trying to write a C program to go between the writer and the reader
and communicate with both of them concerning the
file in question using UNIX sockets, but that seems like overkill and
far more involved than I had hoped it would be.
Please help! I have twelve days left to address this synchronization
issues. I can't replace the 6k lines of C code that
comprise the writer of the PNG file in twelve days, it isn't documented
at all hardly.
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