See sigaction. --- On Thu, 1/12/11, naveen yadav <yad.naveen@gmail.com> wrote:
From: naveen yadav <yad.naveen@gmail.com> Subject: About signal handler install info To: Kernelnewbies@kernelnewbies.org, kernelnewbies@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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