catching problematic signals into a file

[linux_noob0]

Hi, I'd like to know if there's a way to record signals like SIGSEGV and SIGABRT into a file. For example, if I have a program called prog, and I execute it from terminal like:

./prog
it does something, but it touches some forbidden memory and produces a SIGSEGV... I'd like to record that information...

Also, if someone knows how to limit the memory and time given to a program (actual time, not general user time), I'd be really thankful for sharing!

Thanks! :)

[dwhitney67]

AFAIK, you can catch any signal, with the exception of SIGKILL (9).

Here's how to catch SIGSEGV:


#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>


void sighandler(int signo)
{
printf("caught signal %d\n", signo);
exit(signo);
}

int main()
{
struct sigaction sa;

memset(&sa, 0, sizeof(sa));

sa.sa_handler = sighandler;
sigemptyset(&sa.sa_mask);

sigaction(SIGSEGV, &sa, NULL);

int* i = 0;
int j = *i; /* illegal operation that will generate a SIGSEGV */

printf("j = %d\n", j);

return 0;
}

You can place quick/simple code in the signal handler, such as toggling a semaphore; don't make it overly complex because you never know -- another signal may be sent.

[linux_noob0]

Thanks a lot!! :)