I just started using Glade 3.8.5 on Slackware 14.2. I have successfully created a simple window with a callback handler for the "destroy" signal. This is fine for a small and simple tutorial. However, it can be tedious to implement all callback functions manually. There is a chance that I will even forget a few if the GUI is a bit more complicated. Are there any tools that will automatically generate a skeleton for those callback functions in c? I could not find anything via websearch and I am also not sure what tags to search for.
Not sure I understand what you mean by "implement all callback functions manually". The implementation is the content of your callback function, and writing it is your job, because you're the only one who knows what you are trying to achieve.
There is a chance that I will even forget a few if the GUI is a bit more complicated
Each widget has lots and lots of signals. Glade helps you design the UI, but you only have to implement those for which the default comportment doesn't suit what you are trying to achieve.
Now if by "implement all callback functions manually" you mean "write the callback skeleton manually", well at some point back in time glade had some code generation features, but that has been (rightfuly) removed. That's because modifying generated code is a mess to maintain. Coding that skeleton is just a matter of copy/pasting the signal signature from the documentation and giving your callback a name.