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);
}
_______________________________________________
Kernelnewbies mailing list
Kernelnewbies@xxxxxxxxxxxxxxxxx
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
