backtrace와 addr2line을 이용한 디버깅 방법

backtrace.c

#include <execinfo.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <signal.h>
/* sig ==> signal number */
void calltrace(int sig)
{
    int j, nptrs;
#define SIZE 3 
    void *buffer[100];
    char **strings;

    nptrs = backtrace(buffer, SIZE);
    printf("backtrace() returned %d addresses\n", nptrs);

    /* The call backtrace_symbols_fd(buffer, nptrs, STDOUT_FILENO)
       would produce similar output to the following: */

    strings = backtrace_symbols(buffer, nptrs);
    if (strings == NULL) {
        perror("backtrace_symbols");
        exit(EXIT_FAILURE);
    }


    for (j = 0; j < nptrs; j++)
        printf(">>> %s\n", strings[j]);

    free(strings);
    exit(255);
}

void
myfunc3(void)
{
    fprintf(stderr, "%s \n", __func__);

    int *p = NULL;
    *p = 1;
}

static void   /* "static" means don't export the symbol... */
myfunc2(void)
{
    fprintf(stderr, "%s \n", __func__);
    myfunc3();
}

void
myfunc(int ncalls)
{
    fprintf(stderr, "%s \n", __func__);
    if (ncalls > 1)
        myfunc(ncalls - 1);
    else
        myfunc2();
}

int
main(int argc, char *argv[])
{
    if (argc != 2) {
        fprintf(stderr, "%s num-calls\n", argv[0]);
        exit(EXIT_FAILURE);
    }
    (void) signal (SIGSEGV,  calltrace);

    myfunc(atoi(argv[1]));
    exit(EXIT_SUCCESS);
}