1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Ensure that the unwinder can cope with the signal handler.
// REQUIRES: x86_64-linux
#include <assert.h>
#include <dlfcn.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <unwind.h>
_Unwind_Reason_Code frame_handler(struct _Unwind_Context* ctx, void* arg) {
(void)arg;
Dl_info info = { 0, 0, 0, 0 };
assert(dladdr((void*)_Unwind_GetIP(ctx), &info));
// Unwind util the main is reached, above frames deeped on the platfrom and architecture.
if(info.dli_sname && !strcmp("main", info.dli_sname)) {
_Exit(0);
}
return _URC_NO_REASON;
}
void signal_handler(int signum) {
(void)signum;
_Unwind_Backtrace(frame_handler, NULL);
_Exit(-1);
}
int main() {
signal(SIGUSR1, signal_handler);
kill(getpid(), SIGUSR1);
return -2;
}
|
