This is the mail archive of the
gdb@sources.redhat.com
mailing list for the GDB project.
How to get a context ?
- From: Janier Julien <Julien dot Janier at fr dot thalesgroup dot com>
- To: "'gdb at sources dot redhat dot com'" <gdb at sources dot redhat dot com>
- Date: Fri, 4 Jul 2003 18:26:01 +0200
- Subject: How to get a context ?
I hope this is the rigth place for this question, I thinks that gdb dev team
can give me some hints.
I'm trying to get information on a process when a signal is raised like a
sigsegv in order to print a backtrace.
I first try to get the address of the instruction that cause the segfault
with the siginfo_t structure, but this one is most of the time empty and not
filled by the kernel (it depends of the signal and how the crash happen).
Here the code I use :
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <signal.h>
void handler(int cause, siginfo_t *HowCome, void *uap) {
printf("SIGSEGV raised at adress %p\n", HowCome->si_addr);
exit(0);
}
int main(void) {
struct sigaction sa;
sa.sa_sigaction = handler;
sigemptyset( &sa.sa_mask);
sa.sa_flags = SA_SIGINFO;
if (sigaction( SIGSEGV, &sa, 0)) {
perror("Sigaction SUGSEGV");
exit(0);
}
*((int*)0) = 0;
return 0;
}
}
I'd tryed to look on te gdb source but I cant figured out how it is done.
If you can give me some pist I can explore I would be very pleased.
Thanks In advance.
julien