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#include <execinfo.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/// build with `gcc -march=core2 -g -O2 test19.c -o test19 -no-pie -rdynamic`
#define BT_BUF_SIZE 100
void myfunc3()
{
int nptrs;
void *buffer[BT_BUF_SIZE];
char **strings;
nptrs = backtrace(buffer, BT_BUF_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 (int j = 0; j < nptrs; j++) {
// clean-up output so it can be compared
char* p = strchr(strings[j], '[');
if(p)
p[-1] = '\0';
p = strchr(strings[j], '(');
if(p)
*p = ':';
p = strchr(p?p:strings[j], '+');
if(p)
*p = '\0';
p = strchr(p?p:strings[j], ')');
if(p)
*p = '\0';
p = strchr(strings[j], ':');
if(!p)
p = strings[j];
if(!strcmp(p, ":ExitEmulation"))
p = "???";
printf("%s\n", p);
}
free(strings);
}
static void /* "static" means don't export the symbol... */
myfunc2(void)
{
myfunc3();
}
void myfunc(int ncalls)
{
if (ncalls > 1)
myfunc(ncalls - 1);
else
myfunc2();
}
int main(int argc, char *argv[])
{
int ncall = 4;
if (argc == 2) {
ncall = atoi(argv[1]);
}
myfunc(ncall);
exit(EXIT_SUCCESS);
}
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