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#include <dlfcn.h>
#include <stddef.h>
#include <stdlib.h>
#define _frame_level(addr_buf, curr, frame, size) \
do { \
if (__builtin_frame_address(frame) != NULL \
&& (curr = __builtin_return_address(frame)) > 0x1000 \
&& frame <= size) { \
addr_buf[frame] = curr; \
} else { \
return size; \
} \
} while (0)
int backtrace(void **addr_buf, int size)
{
void *curr;
_frame_level(addr_buf, curr, 0, size);
_frame_level(addr_buf, curr, 1, size);
_frame_level(addr_buf, curr, 2, size);
_frame_level(addr_buf, curr, 3, size);
_frame_level(addr_buf, curr, 4, size);
_frame_level(addr_buf, curr, 5, size);
_frame_level(addr_buf, curr, 6, size);
_frame_level(addr_buf, curr, 7, size);
_frame_level(addr_buf, curr, 8, size);
_frame_level(addr_buf, curr, 9, size);
return 9;
}
char **backtrace_symbols(void *const *addr_buf, int size)
{
char **result = calloc(sizeof(char *), size);
if (result == NULL) {
return result;
}
for (int next = 0; next < size; next++) {
Dl_info info;
int err = dladdr(addr_buf[next], &info);
if (err != 0) {
result[next] = "??:0";
} else {
result[next] = info.dli_sname;
}
}
return result;
}
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