Re: signal catching not work

Terry schrieb:
> The code is supposed to catch two segment fault, but the second is
> always missing on my machine. Could anyone tell me why this code
> doesn't work as expected?

> void sighandler(int a){
>     static int i=0;
>     longjmp(buf, ++i);
> }

The manual of signal also states:

       Upon arrival of a signal with number signum the following happens. 
 If  the  corresponding  handler  is  set  to
       SIG_IGN,  then  the signal is ignored.  If the handler is set to
SIG_DFL, then the default action associated with
       the signal (see signal(7)) occurs.  Finally, if the handler is set
to a function sighandler then first either the
       handler  is  reset to SIG_DFL or an implementation-dependent
blocking of the signal is performed and next sighan-
       dler is called with argument signum.

Check, especially, the last sentence. It states that you have to
re-install your signal handler to ensure that it will be used again.


Greetings,
	Thomas
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