static int thread_callback(Dwfl_Thread *thread, void *userdata) {
struct stack_context *c = userdata;
pid_t tid;
assert(thread);
assert(c);
if (c->n_thread >= THREADS_MAX)
return DWARF_CB_ABORT;
if (c->n_thread != 0)
fputc('\n', c->f);
c->n_frame = 0;
tid = dwfl_thread_tid(thread);
fprintf(c->f, "Stack trace of thread " PID_FMT ":\n", tid);
if (dwfl_thread_getframes(thread, frame_callback, c) < 0)
return DWARF_CB_ABORT;
c->n_thread ++;
return DWARF_CB_OK;
}
static int
unwind_thread(Dwfl_Thread *thread, void *data)
{
struct thread_callback_arg *thread_arg = data;
char **error_msg = &thread_arg->error_msg;
struct sr_core_thread *result = sr_core_thread_new();
if (!result)
{
set_error("Failed to initialize stacktrace memory");
return DWARF_CB_ABORT;
}
result->id = (int64_t)dwfl_thread_tid(thread);
struct frame_callback_arg frame_arg =
{
.thread = result,
.error_msg = NULL
};
int ret = dwfl_thread_getframes(thread, frame_callback, &frame_arg);
if (ret == -1)
{
warn("dwfl_thread_getframes failed for thread id %d: %s",
(int)result->id, dwfl_errmsg(-1));
}
else if (ret == DWARF_CB_ABORT)
{
*error_msg = frame_arg.error_msg;
goto abort;
}
else if (ret != 0 && ret != CB_STOP_UNWIND)
{
*error_msg = sr_strdup("Unknown error in dwfl_thread_getframes");
goto abort;
}
if (!error_msg && !frame_arg.thread->frames)
{
set_error("No frames found for thread id %d", (int)result->id);
goto abort;
}
thread_arg->stacktrace->threads =
sr_core_thread_append(thread_arg->stacktrace->threads, result);
return DWARF_CB_OK;
abort:
sr_core_thread_free(result);
return DWARF_CB_ABORT;
}
static int thread_cb(Dwfl_Thread *thread, void *userdata)
{
int ret;
GString **bt = (GString **)userdata;
pid_t tid;
tid = dwfl_thread_tid(thread);
g_string_append_printf(*bt, "\nBacktrace (TID %u):\n",
(unsigned int)tid);
ret = dwfl_thread_getframes(thread, frame_cb, userdata);
switch (ret) {
case -1:
errorstr = g_strdup_printf("Error while iterating"
" through frames for thread"
" %u: %s\n",
(unsigned int)tid,
dwfl_errmsg(-1));
return DWARF_CB_ABORT;
case DWARF_CB_ABORT:
/* already set the error string in frame_cb */
return DWARF_CB_ABORT;
case DWARF_CB_OK:
break;
default:
telem_log(LOG_ERR, "Unrecognized return code\n");
return DWARF_CB_ABORT;
}
// New threads (if any), will require a fresh frame counter
frame_counter = 0;
#if 0
g_string_append_printf(*bt, "\nRegisters (TID %u):\nTODO\n", current,
(unsigned int)tid);
#endif
return DWARF_CB_OK;
}
