On Tue, 16 Jun 1998, James wrote:
> is it possible to have a function called when the user presses ^C or kills
^C generates SIGINT so u may catch it by sigaction()/signal()
SIGKILL cannot be caught so if your process is kill-ed it has no chance of
cleaning after itself. Cleanup routines registered with atexit() are not
called also.
> the program so that the program can 'clean up' before being terminated? (i.e
> close all open files,
automatically done by the kernel when the process is terminated/exits
>write out data,
add the necessary code to the signal handler
>free allocated memory etc).
automatically done by the kernel when the process is terminated/exits
>if so, how?
This ugly piece of code shows the idea...You may wish to take a look at
the Signal Handling section of the libc info files (Ctrl-H , and then I
in emacs)
#include <stdio.h>
#include <signal.h>
struct sigaction sa;
void handle_sigint()
{
/* your cleanup code */
printf("Doing cleanup\n");
fflush(stdout);
raise(SIGINT);
return;
}
int main()
{
sa.sa_handler = handle_sigint;
sa.sa_flags |= SA_ONESHOT;
sigaction(SIGINT,&sa,NULL);
printf("Press Ctrl+C...\n");
return 0;
}
Hope this helps...
Marin
-= Why do we need gates in a world without fences? =-
