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+// Copyright 2015 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#if !defined(UTILS_PROCESS_EXECUTOR_IPP)
+#define UTILS_PROCESS_EXECUTOR_IPP
+
+#include "utils/process/executor.hpp"
+
+#include "utils/fs/path.hpp"
+#include "utils/optional.ipp"
+#include "utils/passwd.hpp"
+#include "utils/process/child.ipp"
+
+namespace utils {
+namespace process {
+
+
+namespace executor {
+namespace detail {
+
+/// Functor to execute a hook in a child process.
+///
+/// The hook is executed after the process has been isolated per the logic in
+/// utils::process::isolation based on the input parameters at construction
+/// time.
+template< class Hook >
+class run_child {
+    /// Function or functor to invoke in the child.
+    Hook _hook;
+
+    /// Directory where the hook may place control files.
+    const fs::path& _control_directory;
+
+    /// Directory to enter when running the subprocess.
+    ///
+    /// This is a subdirectory of _control_directory but is separate so that
+    /// subprocess operations do not inadvertently affect our files.
+    const fs::path& _work_directory;
+
+    /// User to switch to when running the subprocess.
+    ///
+    /// If not none, the subprocess will be executed as the provided user and
+    /// the control and work directories will be writable by this user.
+    const optional< passwd::user > _unprivileged_user;
+
+public:
+    /// Constructor.
+    ///
+    /// \param hook Function or functor to invoke in the child.
+    /// \param control_directory Directory where control files can be placed.
+    /// \param work_directory Directory to enter when running the subprocess.
+    /// \param unprivileged_user If set, user to switch to before execution.
+    run_child(Hook hook,
+              const fs::path& control_directory,
+              const fs::path& work_directory,
+              const optional< passwd::user > unprivileged_user) :
+        _hook(hook),
+        _control_directory(control_directory),
+        _work_directory(work_directory),
+        _unprivileged_user(unprivileged_user)
+    {
+    }
+
+    /// Body of the subprocess.
+    void
+    operator()(void)
+    {
+        executor::detail::setup_child(_unprivileged_user,
+                                      _control_directory, _work_directory);
+        _hook(_control_directory);
+    }
+};
+
+}  // namespace detail
+}  // namespace executor
+
+
+/// Forks and executes a subprocess asynchronously.
+///
+/// \tparam Hook Type of the hook.
+/// \param hook Function or functor to run in the subprocess.
+/// \param timeout Maximum amount of time the subprocess can run for.
+/// \param unprivileged_user If not none, user to switch to before execution.
+/// \param stdout_target If not none, file to which to write the stdout of the
+///     test case.
+/// \param stderr_target If not none, file to which to write the stderr of the
+///     test case.
+///
+/// \return A handle for the background operation.  Used to match the result of
+/// the execution returned by wait_any() with this invocation.
+template< class Hook >
+executor::exec_handle
+executor::executor_handle::spawn(
+    Hook hook,
+    const datetime::delta& timeout,
+    const optional< passwd::user > unprivileged_user,
+    const optional< fs::path > stdout_target,
+    const optional< fs::path > stderr_target)
+{
+    const fs::path unique_work_directory = spawn_pre();
+
+    const fs::path stdout_path = stdout_target ?
+        stdout_target.get() : (unique_work_directory / detail::stdout_name);
+    const fs::path stderr_path = stderr_target ?
+        stderr_target.get() : (unique_work_directory / detail::stderr_name);
+
+    std::auto_ptr< process::child > child = process::child::fork_files(
+        detail::run_child< Hook >(hook,
+                                  unique_work_directory,
+                                  unique_work_directory / detail::work_subdir,
+                                  unprivileged_user),
+        stdout_path, stderr_path);
+
+    return spawn_post(unique_work_directory, stdout_path, stderr_path,
+                      timeout, unprivileged_user, child);
+}
+
+
+/// Forks and executes a subprocess asynchronously in the context of another.
+///
+/// By context we understand the on-disk state of a previously-executed process,
+/// thus the new subprocess spawned by this function will run with the same
+/// control and work directories as another process.
+///
+/// \tparam Hook Type of the hook.
+/// \param hook Function or functor to run in the subprocess.
+/// \param base Context of the subprocess in which to run this one.  The
+///     exit_handle provided here must remain alive throughout the existence of
+///     this other object because the original exit_handle is the one that owns
+///     the on-disk state.
+/// \param timeout Maximum amount of time the subprocess can run for.
+///
+/// \return A handle for the background operation.  Used to match the result of
+/// the execution returned by wait_any() with this invocation.
+template< class Hook >
+executor::exec_handle
+executor::executor_handle::spawn_followup(Hook hook,
+                                          const exit_handle& base,
+                                          const datetime::delta& timeout)
+{
+    spawn_followup_pre();
+
+    std::auto_ptr< process::child > child = process::child::fork_files(
+        detail::run_child< Hook >(hook,
+                                  base.control_directory(),
+                                  base.work_directory(),
+                                  base.unprivileged_user()),
+        base.stdout_file(), base.stderr_file());
+
+    return spawn_followup_post(base, timeout, child);
+}
+
+
+}  // namespace process
+}  // namespace utils
+
+#endif  // !defined(UTILS_PROCESS_EXECUTOR_IPP)