How to check whether signal handlers remain installed?

[fonz]

From signal(3) (bold face removed because I don't want to look like I'm yelling):

Unlike previous signal facilities, the handler func() remains installed after a signal has been delivered.

Although I personally find this much more convenient than the old way, I was wondering if there is a simple and portable way to check whether this is the case, e.g. something along the lines of

void
sighandler(int sig)
{
    do_something();
    ...
#ifdef SOMETHING_OR_OTHER
    signal(SIGTHIS,&sighandler); /* reinstall the handler */
#endif
}

Fonz

 

[jilles@]

Use sigaction(2)() and it is fully defined and portable that the handler remains installed.

 

[fonz]

Sounds like a plan

Use sigaction(2)()

Thanks, I'll look into that. I'm still used to the simpler signal(3) system, but maybe it's time to switch over.

Fonz