1 files changed, 71 insertions, 0 deletions
diff --git a/dependencies/pkg/mod/golang.org/x/sys@v0.1.0/unix/darwin_test.go b/dependencies/pkg/mod/golang.org/x/sys@v0.1.0/unix/darwin_test.go
new file mode 100644
index 0000000..ef8af08
--- /dev/null
+++ b/dependencies/pkg/mod/golang.org/x/sys@v0.1.0/unix/darwin_test.go
@@ -0,0 +1,71 @@
+// Copyright 2018 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 darwin && go1.12
+// +build darwin,go1.12
+
+package unix
+
+import (
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+type darwinTest struct {
+	name string
+	f    uintptr
+}
+
+// TODO(khr): decide whether to keep this test enabled permanently or
+// only temporarily.
+func TestDarwinLoader(t *testing.T) {
+	// Make sure the Darwin dynamic loader can actually resolve
+	// all the system calls into libSystem.dylib. Unfortunately
+	// there is no easy way to test this at compile time. So we
+	// implement a crazy hack here, calling into the syscall
+	// function with all its arguments set to junk, and see what
+	// error we get. We are happy with any error (or none) except
+	// an error from the dynamic loader.
+	//
+	// We have to run each test in a separate subprocess for fault isolation.
+	//
+	// Hopefully the junk args won't accidentally ask the system to do "rm -fr /".
+	//
+	// In an ideal world each syscall would have its own test, so this test
+	// would be unnecessary. Unfortunately, we do not live in that world.
+	for _, test := range darwinTests {
+		// Call the test binary recursively, giving it a magic argument
+		// (see init below) and the name of the test to run.
+		cmd := exec.Command(os.Args[0], "testDarwinLoader", test.name)
+
+		// Run subprocess, collect results. Note that we expect the subprocess
+		// to fail somehow, so the error is irrelevant.
+		out, _ := cmd.CombinedOutput()
+
+		if strings.Contains(string(out), "dyld: Symbol not found:") {
+			t.Errorf("can't resolve %s in libSystem.dylib", test.name)
+		}
+		if !strings.Contains(string(out), "success") {
+			// Not really an error. Might be a syscall that never returns,
+			// like exit, or one that segfaults, like gettimeofday.
+			t.Logf("test never finished: %s: %s", test.name, string(out))
+		}
+	}
+}
+
+func init() {
+	// The test binary execs itself with the "testDarwinLoader" argument.
+	// Run the test specified by os.Args[2], then panic.
+	if len(os.Args) >= 3 && os.Args[1] == "testDarwinLoader" {
+		for _, test := range darwinTests {
+			if test.name == os.Args[2] {
+				syscall_syscall(test.f, ^uintptr(0), ^uintptr(0), ^uintptr(0))
+			}
+		}
+		// Panic with a "success" label, so the parent process can check it.
+		panic("success")
+	}
+}