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- // Copyright 2015 The Go Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
- //go:build !windows && !android
- // +build !windows,!android
- // Test that the Go runtime still works if C code changes the signal stack.
- package cgotest
- /*
- #include <signal.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #ifdef _AIX
- // On AIX, SIGSTKSZ is too small to handle Go sighandler.
- #define CSIGSTKSZ 0x4000
- #else
- #define CSIGSTKSZ SIGSTKSZ
- #endif
- static stack_t oss;
- static char signalStack[CSIGSTKSZ];
- static void changeSignalStack(void) {
- stack_t ss;
- memset(&ss, 0, sizeof ss);
- ss.ss_sp = signalStack;
- ss.ss_flags = 0;
- ss.ss_size = CSIGSTKSZ;
- if (sigaltstack(&ss, &oss) < 0) {
- perror("sigaltstack");
- abort();
- }
- }
- static void restoreSignalStack(void) {
- #if (defined(__x86_64__) || defined(__i386__)) && defined(__APPLE__)
- // The Darwin C library enforces a minimum that the kernel does not.
- // This is OK since we allocated this much space in mpreinit,
- // it was just removed from the buffer by stackalloc.
- oss.ss_size = MINSIGSTKSZ;
- #endif
- if (sigaltstack(&oss, NULL) < 0) {
- perror("sigaltstack restore");
- abort();
- }
- }
- static int zero(void) {
- return 0;
- }
- */
- import "C"
- import (
- "runtime"
- "testing"
- )
- func testSigaltstack(t *testing.T) {
- switch {
- case runtime.GOOS == "solaris", runtime.GOOS == "illumos", runtime.GOOS == "ios" && runtime.GOARCH == "arm64":
- t.Skipf("switching signal stack not implemented on %s/%s", runtime.GOOS, runtime.GOARCH)
- }
- C.changeSignalStack()
- defer C.restoreSignalStack()
- defer func() {
- if recover() == nil {
- t.Error("did not see expected panic")
- }
- }()
- v := 1 / int(C.zero())
- t.Errorf("unexpected success of division by zero == %d", v)
- }
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