[ILUG] Signal handling thing

[Padraig Brady]

Sorry I haven't looked at this, but
my motto is don't use signal, use sigaction
for many reasons.

Padraig.

David Neary wrote:
> Hi all,
> 
> This is kind of puzzling me - I'm sure I've done stuff similar to
> this a million tomes, but I'm having trouble getting this
> working. Can anyone see what I'm doing wrong here?
> 
> Basically I'm expecting signal 42 (MYSIG) to be raised an
> indefinite number of times, until I raise SIGINT in the usual
> manner. But I'm getting a system "Real-time signal 10" message,
> and the program exits, after the first call (presumably, when my
> sign-handler's called a second time). Any idea why? Something
> idiotic I'm missing?
> 
> Cheers,
> Dave.
> 
> ------- test_signal.c ------------
> 
> #include <signal.h> /* Signal stuff */
> #include <stdlib.h> /* exit() */
> #include <errno.h> 
> #include <stdio.h> /* fprintf() */
> 
> enum custom_sigs{
>   MY_SIG=42
> }; /* Name signals - just out of habit. */
> 
> void custom_signal(int sig)
> {
>   fprintf(stderr, "My signal got raised. It's signal number %d.\n", sig);
> }
>     
> void interrupt(int sig)
> {
>   fprintf(stderr, "Received a SIGINT signal - quitting\n");
>   exit(0);
> }
> 
> int main(void)
> {
>   if(signal(SIGINT, interrupt) == SIG_ERR)
>   {
>     perror("Signal attach failed!!!\n");
>     exit(1);
>   }
> 
>   if(signal(MY_SIG, custom_signal) == SIG_ERR)
>     {
>       perror("Custom signal attach failed!!!\n");
>       exit(1);
>     }
> 
>   while(1)
>     raise(MY_SIG); /* To break the loop, interrupt (Ctrl-C) */
> 
>   return 0;
> }
> 
> ------- EOF -----------
>