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#include <signal.h>
main()
{
/*
* Declare handler routine so we can use its
* name.
*/
extern int handler();
/*
* Send signal to handler routine. Only do so
* if the signal is not already being ignored.
*/
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, handler);
/*
* Loop here.
*/
for (;;)
pause();
}
/*
* handler--handle the signal. sig is the signal
* number which interrupted us.
*/
handler(sig)
int sig;
{
/*
* Users of 4.2 and 4.3BSD systems should un-comment
* this line, which will make this program
* behave as if it were on a non-Berkeley
* system (we reset the signal by hand).
*/
/* signal(sig, SIG_DFL); */
/*
* Ignore the signal for the duration of this
* routine.
*/
signal(sig, SIG_IGN);
printf("OUCH\n");
/*
* Reset the signal to come here again.
*/
signal(SIGINT, handler);
}
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