libgo/misc/cgo/testcarchive/main_unix.c

   1 // Copyright 2015 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 #include <signal.h>
   6 #include <stdint.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 struct sigaction sa;
  12 struct sigaction osa;
  13
  14 static void (*oldHandler)(int, siginfo_t*, void*);
  15
  16 static void handler(int signo, siginfo_t* info, void* ctxt) {
  17         if (oldHandler) {
  18                 oldHandler(signo, info, ctxt);
  19         }
  20 }
  21
  22 int install_handler() {
  23         // Install our own signal handler.
  24         memset(&sa, 0, sizeof sa);
  25         sa.sa_sigaction = handler;
  26         sigemptyset(&sa.sa_mask);
  27         sa.sa_flags = SA_ONSTACK | SA_SIGINFO;
  28         memset(&osa, 0, sizeof osa);
  29         sigemptyset(&osa.sa_mask);
  30         if (sigaction(SIGSEGV, &sa, &osa) < 0) {
  31                 perror("sigaction");
  32                 return 2;
  33         }
  34         if (osa.sa_handler == SIG_DFL) {
  35                 fprintf(stderr, "Go runtime did not install signal handler\n");
  36                 return 2;
  37         }
  38         // gccgo does not set SA_ONSTACK for SIGSEGV.
  39         if (getenv("GCCGO") == "" && (osa.sa_flags&SA_ONSTACK) == 0) {
  40                 fprintf(stderr, "Go runtime did not install signal handler\n");
  41                 return 2;
  42         }
  43         oldHandler = osa.sa_sigaction;
  44
  45         return 0;
  46 }
  47
  48 int check_handler() {
  49         if (sigaction(SIGSEGV, NULL, &sa) < 0) {
  50                 perror("sigaction check");
  51                 return 2;
  52         }
  53         if (sa.sa_sigaction != handler) {
  54                 fprintf(stderr, "ERROR: wrong signal handler: %p != %p\n", sa.sa_sigaction, handler);
  55                 return 2;
  56         }
  57         return 0;
  58 }
  59