Hi,
When upgrading from 8.2.013 -> 8.3.0 on Arch Linux x86_64 I noticed that
one of the software that I use, NGSpice[1], that uses readline stopped
working as expected.
In short; NGSpice spawns a prompt and captures the input from the user,
however when using readline 8.3.0 there is no input being captured.
After testing a bit in their code I found that it's the rl_event_hook
that causes the issue.
For testability, the following code snippet has the same interaction as
NGSpice uses:
```
#include <stdio.h>
#include <stdlib.h>
#include <readline/readline.h>
#include <readline/history.h>
int my_event_hook(void) {
// NGSpice handles input here, for testing purposes just return 0.
return 0;
}
int main(void) {
char *line;
rl_event_hook = my_event_hook;
while ((line = readline("prompt> ")) != NULL) {
if (*line) {
add_history(line);
printf("You typed: %s\n", line);
}
free(line);
}
printf("\nEOF received, exiting...\n");
return 0;
}
```
Using 8.2.013: I get the expected prompt and I can handle input as
expected.
Using 8.3.0: I get no input, and readline pegs one of my CPU cores at 100%
I'm no readline user so please let me know if this is a downstream issue
or not, so I can report it to the proper channels.
Thanks in advance
With best regards,
Torleif Skår
[1]: https://ngspice.sourceforge.io/
