See sigaction.
--- On Thu, 1/12/11, naveen yadav <yad.naveen at gmail.com> wrote:
> From: naveen yadav <yad.naveen at gmail.com>
> Subject: About signal handler install info
> To: Kernelnewbies at kernelnewbies.org, kernelnewbies at nl.linux.org
> Date: Thursday, 1 December, 2011, 3:33 PM
> Dear All,
>
> I want to know is there any method/API to know
> whether there is
> previous signal handler for specific signal no.
>
> Example:
>
> In below case we install 3 handler. So my question is
> if before
> calling signal (SIGUSR1, handler2); is there any way i can
> get info
> that there is "handler1" already install with SIGUSR1.
>
> signal (SIGUSR1, handler1);
> signal (SIGUSR1, handler2);
> signal (SIGUSR1, handler3);
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <pthread.h>
> #include <signal.h>
>
> void *func ();
>
> void handler1 ()
> {
> printf ("\nIn handler 1\n");
> }
>
> void handler2 ()
> {
> printf ("\nIn handler 2\n");
> }
>
> void handler3 ()
> { printf ("\nIn handler 3\n"); }
> int main ()
> {
> int err=-1;
> pthread_t t1,t2;
>
>
> signal (SIGUSR1, handler1);
> sleep(5);
> signal (SIGUSR1, handler2);
> sleep(5);
> signal (SIGUSR1, handler3);
> sleep(5);
> pthread_create (&t1, NULL,
> &func, NULL);
>
> sleep(20);
>
> return 0;
> }
>
> void *func()
> {
> while (1) usleep(10);
> }
>
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