This seems like it has 2 use cases.
Internal console management around reprinting command prompt, but many
modes of operation delegate the prompt processing to tkcon or readline.
Process termination to restore the termios.
This function is related to libreadline rl_pre_input_hook callback
which is invoked as (not making use of any function return value):
readline.c: (*rl_pre_input_hook) ();
The general prototype for this function is:
rltypedefs.h:typedef int rl_hook_func_t PARAMS((void));
So the resolution is to provide a known value as the return value, which
resolves the concern.
SonarCloud
textio/txInput.c:550 non-void function does not return a value
https://sonarcloud.io/project/issues?open=AZJB17NwNGfDNup0Rj5G&id=dlmiles_magic
Darryl L. Miles
Johan Euphrosine
Alessandro De Laurenzis
Brad Smith
Tim Edwards