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[리눅스 개발환경] 04. backtrace #74

Open tonykang22 opened 2 years ago

tonykang22 commented 2 years ago

04. backtrace



#include <execinfo.h>

int backtrace (void **buffer, int size);



#include <execinfo.h>

char **backtrace_symbols (void *const *buffer, int size);



#include <execinfo.h>

void backtrace_symbols_fd (void *const *buffer, int size, int fd);



backtrace 예제

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

/* Obtain a backtrace and print it to stdout. 
*/ void print_trace (void)
{
    void *array[10]; 
    size_t size; 
    char **strings; 
    size_t i;

    size = backtrace (array, 10);
    strings = backtrace_symbols (array, size);

    printf ("Obtained %d stack frames.\n", size);
    for (i = 0; i < size; i++) 
        printf ("%s\n", strings[i]);

    free (strings); 
}

/* A dummy function to make the backtrace more interesting. */ 
void dummy_function (void)
{
    print_trace ();
}
int main (void)
{
    dummy_function ();
    return 0; 
}


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addr2line



실전 TIP

문제



해결책



예시

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

void segv_handler(int sig) { 
    int j, nptrs;
#define SIZE 100 
    void *buffer[100];
    char **strings;

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

    fprintf(stderr, "ERROR: signal(%d)\n", sig); 
    backtrace_symbols_fd(buffer, nptrs, STDERR_FILENO); 
    exit(1);
}

void foo() {
    printf("foo\n"); 
}

void bar() {
    printf("bar\n"); 
}

void first_to_space(char *str) { 
    printf("func start\n");
    str[0] = ' ';
    printf("func end\n"); 
}

int main(int argc, char **argv)
{
    char *str = NULL;

    signal(SIGSEGV, segv_handler);

    foo();
    bar(); 
    first_to_space(str);

    return 0; 
}
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