204 kamil@chieftec /tmp/dumper $ cat test.c                                                                                          
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <assert.h>

void
handler(int sig)
{
        printf("Hello from signal handler, captured=%s\n", signalname(sig));
        _exit(0);
}

int
main(int argc, char **argv)
{
        int status;
        pid_t child, wpid;
        volatile int *trigger;

        trigger = (int *)(intptr_t)argc;

        child = fork();
        if (child == 0) {
                signal(SIGSEGV, handler);

                *trigger = 0x0;

                _exit(1);
        }

        wpid = waitpid(child, &status, 0);
        assert(wpid == child);
        assert(WIFEXITED(status));
        assert(WEXITSTATUS(status) == 0);

        return 0;
}
205 kamil@chieftec /tmp/dumper $ file a.out.core
a.out.core: cannot open `a.out.core' (No such file or directory)
206 kamil@chieftec /tmp/dumper $ gcc -g -O0 test.c                                   
207 kamil@chieftec /tmp/dumper $ ./a.out           
Hello from signal handler, captured=SEGV
208 kamil@chieftec /tmp/dumper $ file a.out.core   
a.out.core: cannot open `a.out.core' (No such file or directory)
209 kamil@chieftec /tmp/dumper $ /public/picotrace/coredumper/coredumper -i ./a.out  
Hello from signal handler, captured=SEGV
210 kamil@chieftec /tmp/dumper $ file a.out.core                                     
a.out.core: ELF 64-bit LSB core file, x86-64, version 1 (SYSV), NetBSD-style, from 'a.out', pid=2587, uid=1000, gid=100, nlwps=1, lwp=1 (signal 11/code 1)
211 kamil@chieftec /tmp/dumper $ lldb -c ./a.out.core ./a.out                        
(lldb) target create "./a.out" --core "./a.out.core"
Core file '/tmp/dumper/a.out.core' (x86_64) was loaded.
(lldb) bt
* thread #1, stop reason = signal SIGSEGV
  * frame #0: 0x0000000000400bd4 a.out`main(argc=1, argv=0x00007f7fffffe778) at test.c:28
    frame #1: 0x0000000000400a9d a.out`___start + 280
(lldb) list
   17   {
   18           int status;
   19           pid_t child, wpid;
   20           volatile int *trigger;
   21   
   22           trigger = (int *)(intptr_t)argc;
   23   
   24           child = fork();
   25           if (child == 0) {
   26                   signal(SIGSEGV, handler);
(lldb) 
   27   
   28                   *trigger = 0x0;
   29   
   30                   _exit(1);
   31           }
   32   
   33           wpid = waitpid(child, &status, 0);
   34           assert(wpid == child);
   35           assert(WIFEXITED(status));
   36           assert(WEXITSTATUS(status) == 0);
(lldb)