Re: crash in rl_prep_terminal() without rl_outstream

[Chet Ramey]

On 11/16/20 12:26 PM, Nick Black wrote:
> Chet Ramey left as an exercise for the reader:
> > Readline provides defaults for rl_instream and rl_outstream the first time
> > it's called. These are in place before the first time rl_prep_terminal is
> > called. If an application using readline decides to change the file pointer
> > assigned to either of these variables, readline allows it.
>
> Hrmmm. I definitely was crashing within rl_prep_terminal() (as
> noted with valgrind) until I set this. I'll look deeper into how
> this was happening, but gdb verified that rl_outstream was NULL
> when the writeouts at the end of this function were hit.

Are you calling rl_prep_terminal directly, or letting readline call it for
you? If you call it before readline can initialize, or are calling it
without calling rl_initialize, all bets are off.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/