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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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