libgo/misc/cgo/testsanitizers/tsan_shared.go

   1 // Copyright 2017 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package main
   6
   7 // This program failed with SIGSEGV when run under the C/C++ ThreadSanitizer.
   8 // The Go runtime had re-registered the C handler with the wrong flags due to a
   9 // typo, resulting in null pointers being passed for the info and context
  10 // parameters to the handler.
  11
  12 /*
  13 #cgo CFLAGS: -fsanitize=thread
  14 #cgo LDFLAGS: -fsanitize=thread
  15
  16 #include <signal.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <ucontext.h>
  21
  22 void check_params(int signo, siginfo_t *info, void *context) {
  23         ucontext_t* uc = (ucontext_t*)(context);
  24
  25         if (info->si_signo != signo) {
  26                 fprintf(stderr, "info->si_signo does not match signo.\n");
  27                 abort();
  28         }
  29
  30         if (uc->uc_stack.ss_size == 0) {
  31                 fprintf(stderr, "uc_stack has size 0.\n");
  32                 abort();
  33         }
  34 }
  35
  36
  37 // Set up the signal handler in a high priority constructor, so
  38 // that it is installed before the Go code starts.
  39
  40 static void register_handler(void) __attribute__ ((constructor (200)));
  41
  42 static void register_handler() {
  43         struct sigaction sa;
  44         memset(&sa, 0, sizeof(sa));
  45         sigemptyset(&sa.sa_mask);
  46         sa.sa_flags = SA_SIGINFO;
  47         sa.sa_sigaction = check_params;
  48
  49         if (sigaction(SIGUSR1, &sa, NULL) != 0) {
  50                 perror("failed to register SIGUSR1 handler");
  51                 exit(EXIT_FAILURE);
  52         }
  53 }
  54 */
  55 import "C"
  56
  57 import "syscall"
  58
  59 func init() {
  60         C.raise(C.int(syscall.SIGUSR1))
  61 }
  62
  63 func main() {}