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+// Copyright 2010 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.
+
+/// \file utils/process/child.hpp
+/// Spawning and manipulation of children processes.
+///
+/// The child module provides a set of functions to spawn subprocesses with
+/// different settings, and the corresponding set of classes to interact with
+/// said subprocesses.  The interfaces to fork subprocesses are very simplified
+/// and only provide the minimum functionality required by the rest of the
+/// project.
+///
+/// Be aware that the semantics of the fork and wait methods exposed by this
+/// module are slightly different from that of the native calls.  Any process
+/// spawned by fork here will be isolated in its own session; once any of
+/// such children processes is awaited for, its whole process group will be
+/// terminated.  This is the semantics we want in the above layers to ensure
+/// that test programs (and, for that matter, external utilities) do not leak
+/// subprocesses on the system.
+
+#if !defined(UTILS_PROCESS_CHILD_HPP)
+#define UTILS_PROCESS_CHILD_HPP
+
+#include "utils/process/child_fwd.hpp"
+
+#include <istream>
+#include <memory>
+#include <stdexcept>
+
+#include "utils/defs.hpp"
+#include "utils/fs/path_fwd.hpp"
+#include "utils/noncopyable.hpp"
+#include "utils/process/operations_fwd.hpp"
+#include "utils/process/status_fwd.hpp"
+
+namespace utils {
+namespace process {
+
+
+namespace detail {
+
+void report_error_and_abort(void) UTILS_NORETURN;
+void report_error_and_abort(const std::runtime_error&) UTILS_NORETURN;
+
+
+}  // namespace detail
+
+
+/// Child process spawner and controller.
+class child : noncopyable {
+    struct impl;
+
+    /// Pointer to the shared internal implementation.
+    std::auto_ptr< impl > _pimpl;
+
+    static std::auto_ptr< child > fork_capture_aux(void);
+
+    static std::auto_ptr< child > fork_files_aux(const fs::path&,
+                                                 const fs::path&);
+
+    explicit child(impl *);
+
+public:
+    ~child(void);
+
+    template< typename Hook >
+    static std::auto_ptr< child > fork_capture(Hook);
+    std::istream& output(void);
+
+    template< typename Hook >
+    static std::auto_ptr< child > fork_files(Hook, const fs::path&,
+                                             const fs::path&);
+
+    static std::auto_ptr< child > spawn_capture(
+        const fs::path&, const args_vector&);
+    static std::auto_ptr< child > spawn_files(
+        const fs::path&, const args_vector&, const fs::path&, const fs::path&);
+
+    int pid(void) const;
+
+    status wait(void);
+};
+
+
+}  // namespace process
+}  // namespace utils
+
+#endif  // !defined(UTILS_PROCESS_CHILD_HPP)