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1 // Copyright 2015 The Go Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style
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3 // license that can be found in the LICENSE file.
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4
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5 // +build !windows,!android
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6
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7 // Test that the Go runtime still works if C code changes the signal stack.
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8
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9 package cgotest
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10
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11 /*
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12 #include <signal.h>
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13 #include <stdio.h>
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14 #include <stdlib.h>
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15 #include <string.h>
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16
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17 static stack_t oss;
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18 static char signalStack[SIGSTKSZ];
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19
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20 static void changeSignalStack(void) {
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21 stack_t ss;
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22 memset(&ss, 0, sizeof ss);
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23 ss.ss_sp = signalStack;
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24 ss.ss_flags = 0;
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25 ss.ss_size = SIGSTKSZ;
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26 if (sigaltstack(&ss, &oss) < 0) {
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27 perror("sigaltstack");
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28 abort();
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29 }
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30 }
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31
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32 static void restoreSignalStack(void) {
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33 #if (defined(__x86_64__) || defined(__i386__)) && defined(__APPLE__)
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34 // The Darwin C library enforces a minimum that the kernel does not.
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35 // This is OK since we allocated this much space in mpreinit,
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36 // it was just removed from the buffer by stackalloc.
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37 oss.ss_size = MINSIGSTKSZ;
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38 #endif
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39 if (sigaltstack(&oss, NULL) < 0) {
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40 perror("sigaltstack restore");
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41 abort();
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42 }
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43 }
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44
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45 static int zero(void) {
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46 return 0;
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47 }
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48 */
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49 import "C"
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50
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51 import (
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52 "runtime"
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53 "testing"
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54 )
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55
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56 func testSigaltstack(t *testing.T) {
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57 switch {
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58 case runtime.GOOS == "solaris", runtime.GOOS == "darwin" && (runtime.GOARCH == "arm" || runtime.GOARCH == "arm64"):
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59 t.Skipf("switching signal stack not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
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60 case runtime.GOOS == "darwin" && runtime.GOARCH == "386":
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61 t.Skipf("sigaltstack fails on darwin/386")
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62 }
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63
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64 C.changeSignalStack()
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65 defer C.restoreSignalStack()
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66 defer func() {
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67 if recover() == nil {
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68 t.Error("did not see expected panic")
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69 }
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70 }()
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71 v := 1 / int(C.zero())
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72 t.Errorf("unexpected success of division by zero == %d", v)
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73 }
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