[PATCH 2/2] app/pdump: handle SIGTERM and SIGHUP

[Stephen Hemminger]

On Tue, 27 Feb 2024 09:59:37 +0000
"Pattan, Reshma" <reshma.pattan at intel.com> wrote:

> > -----Original Message-----
> > From: Stephen Hemminger <stephen at networkplumber.org>
> > +	sigaction(SIGHUP, NULL, &origaction);  
>  
> Why do we need this ?  Can't be this direct sigaction(SIGHUP, &action, NULL)  without a below if code? 
> Can you please explain how this works. 
> 
> > +	if (origaction.sa_handler == SIG_DFL)
> > +		sigaction(SIGHUP, &action, NULL);
> >   
> 


If sighup is being ignored already (for example being run by nohup)
then the program should keep ignoring SIGHUP.

This is the method used in tshark and dumpcap utilities in wireshark
and it made sense.