The ups and downs of strlcpy()

The ups and downs of strlcpy()

Posted Jul 25, 2012 15:40 UTC (Wed) by mmorrow (subscriber, #83845)
In reply to: The ups and downs of strlcpy() by nix
Parent article: The ups and downs of strlcpy()

Backtracing on x86_64 is actually quite reasonable. Here are two methods:

#if defined(USE_BACKTRACE)
/*
  -DUSE_BACKTRACE -rdynamic
  (-rdynamic for backtrace_symbols)
*/
#include <execinfo.h>
void print_trace(void)
{
  const size_t n = 10
  void *array[n];
  size_t size = backtrace(array,n);
  char **strings = backtrace_symbols(array,size);
  for(size_t i = 0; i < size; i++)
    fprintf(stderr,"%s\n",strings[i]);
  free(strings);
}
#elif defined(USE_LIBUNWIND)
/*
  -DUSE_LIBUNWIND -lunwind-x86_64
*/
#include <libunwind.h>
void print_trace(void)
{
  unw_cursor_t cur;
  unw_context_t cxt;
  unw_getcontext(&cxt);
  unw_init_local(&cur,&cxt);
  while(unw_step(&cur) > 0)
  {
    unw_word_t off, pc;
    char fname[64] = {[0] = '\0'};
    unw_get_reg(&cur,UNW_REG_IP,&pc);
    unw_get_proc_name(&cur,fname,sizeof(fname),&off);
    printf("%p: (%s+0x%x) [%p]\n",pc,fname,off,pc);
  }
}
#endif

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9c9
<   const size_t n = 10
---
>   const size_t n = 10;