I want my C (NOT C++) program to have its input be the text that was
hi-lited with a mouse and then the user pressed Ctl-C.
It would be nice if EVERY time new text is hi-lited and Ctl-C is
pressed my program can be notified that NEW data is available.
I am guessing that my program should run as a daemon and be sent
a USR1 or USR2 signal to tell me that new data was hi-lited.

1 Where is this buffer kept, what is its name, how to access it.
2 What is the OS program name that DOES the pasting to the buffer.
I may need to modify it to send my program a Signal that new text
has been hi-lited, Ctl-C was pressed and new text is in the buffer.

Possible starting point: https://www.uninformativ.de/blog/pos...OSTING-en.html

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I dunno what you're asking. I do know highlighted text pasting with middle click is part of X11 itself, not a particular desktop, and doesnt always work in wayland anymore It is separate and independent of desktops and apps and xclip and pyclip etc copy/paste functionality.

Keywords: Clipboard, selection, Primary, secondary...
Try something like 'man xclip'.
or 'apropos clipboard'
Results do not seem to be specific to C but it's a starting point.
Happy web searching!

Source for xorg-xclipboard
https://xorg.freedesktop.org/archive...-1.1.3.tar.bz2

xclip
https://github.com/astrand/xclip

wl-clipboard
https://github.com/bugaevc/wl-clipboard

1 members found this post helpful.