1 files changed, 43 insertions, 0 deletions
diff --git a/src/internal/testenv/testenv_unix.go b/src/internal/testenv/testenv_unix.go
new file mode 100644
index 0000000..a629078
--- /dev/null
+++ b/src/internal/testenv/testenv_unix.go
@@ -0,0 +1,43 @@
+// Copyright 2021 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 unix
+
+package testenv
+
+import (
+	"errors"
+	"io/fs"
+	"syscall"
+)
+
+// Sigquit is the signal to send to kill a hanging subprocess.
+// Send SIGQUIT to get a stack trace.
+var Sigquit = syscall.SIGQUIT
+
+func syscallIsNotSupported(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	var errno syscall.Errno
+	if errors.As(err, &errno) {
+		switch errno {
+		case syscall.EPERM, syscall.EROFS:
+			// User lacks permission: either the call requires root permission and the
+			// user is not root, or the call is denied by a container security policy.
+			return true
+		case syscall.EINVAL:
+			// Some containers return EINVAL instead of EPERM if a system call is
+			// denied by security policy.
+			return true
+		}
+	}
+
+	if errors.Is(err, fs.ErrPermission) || errors.Is(err, errors.ErrUnsupported) {
+		return true
+	}
+
+	return false
+}