Re: [Help-bash] readline does not always handle SIGTERM on reboot

[Chet Ramey]

On 4/7/18 6:03 PM, john smith wrote:
> I discovered that I can kill current session of bash with the following:
> 
> (sleep 1; kill $$) &
> 
> Only in such situation is rl_signal_handler() called, errno is set to
> EINTR in rl_getc() and EOF is returned.  I just don't understand why
> rl_signal_handler() is not called when this is done:
> 
> kill $$

Because readline's signal handlers are not installed when the calling
application is not making a call to readline().

Think about what happens when you run this. You hit return, readline
uninstalls its signal handlers and returns "kill $$" to bash, the calling
application. Bash takes that command and runs it, waiting for the command
to complete and collecting its return status. The command causes a signal
to be sent, which is handled by the bash SIGTERM signal handler.

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