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+//
+// Automated Testing Framework (atf)
+//
+// Copyright (c) 2008 The NetBSD Foundation, Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// 2. 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.
+//
+// THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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(TOOLS_PROCESS_HPP)
+#define TOOLS_PROCESS_HPP
+
+extern "C" {
+#include <sys/types.h>
+
+#include <unistd.h>
+}
+
+#include <cerrno>
+#include <cstdlib>
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "auto_array.hpp"
+#include "exceptions.hpp"
+#include "fs.hpp"
+
+namespace tools {
+namespace process {
+
+class child;
+class status;
+
+// ------------------------------------------------------------------------
+// The "argv_array" type.
+// ------------------------------------------------------------------------
+
+class argv_array {
+ typedef std::vector< std::string > args_vector;
+ args_vector m_args;
+
+ // TODO: This is immutable, so we should be able to use
+ // std::tr1::shared_array instead when it becomes widely available.
+ // The reason would be to remove all copy constructors and assignment
+ // operators from this class.
+ auto_array< const char* > m_exec_argv;
+ void ctor_init_exec_argv(void);
+
+public:
+ typedef args_vector::const_iterator const_iterator;
+ typedef args_vector::size_type size_type;
+
+ argv_array(void);
+ argv_array(const char*, ...);
+ explicit argv_array(const char* const*);
+ template< class C > explicit argv_array(const C&);
+ argv_array(const argv_array&);
+
+ const char* const* exec_argv(void) const;
+ size_type size(void) const;
+ const char* operator[](int) const;
+
+ const_iterator begin(void) const;
+ const_iterator end(void) const;
+
+ argv_array& operator=(const argv_array&);
+};
+
+template< class C >
+argv_array::argv_array(const C& c)
+{
+ for (typename C::const_iterator iter = c.begin(); iter != c.end();
+ iter++)
+ m_args.push_back(*iter);
+ ctor_init_exec_argv();
+}
+
+// ------------------------------------------------------------------------
+// The "stream" types.
+// ------------------------------------------------------------------------
+
+class stream_capture {
+ int m_pipefds[2];
+
+ // Allow access to the getters.
+ template< class OutStream, class ErrStream > friend
+ child fork(void (*)(void*), OutStream, ErrStream, void*);
+ template< class OutStream, class ErrStream > friend
+ status exec(const tools::fs::path&, const argv_array&,
+ const OutStream&, const ErrStream&, void (*)(void));
+
+ void prepare(void);
+ int connect_parent(void);
+ void connect_child(const int);
+
+public:
+ stream_capture(void);
+ ~stream_capture(void);
+};
+
+class stream_connect {
+ int m_src_fd;
+ int m_tgt_fd;
+
+ // Allow access to the getters.
+ template< class OutStream, class ErrStream > friend
+ child fork(void (*)(void*), OutStream, ErrStream, void*);
+ template< class OutStream, class ErrStream > friend
+ status exec(const tools::fs::path&, const argv_array&,
+ const OutStream&, const ErrStream&, void (*)(void));
+
+ void prepare(void);
+ int connect_parent(void);
+ void connect_child(const int);
+
+public:
+ stream_connect(const int, const int);
+};
+
+class stream_inherit {
+ // Allow access to the getters.
+ template< class OutStream, class ErrStream > friend
+ child fork(void (*)(void*), OutStream, ErrStream, void*);
+ template< class OutStream, class ErrStream > friend
+ status exec(const tools::fs::path&, const argv_array&,
+ const OutStream&, const ErrStream&, void (*)(void));
+
+ void prepare(void);
+ int connect_parent(void);
+ void connect_child(const int);
+
+public:
+ stream_inherit(void);
+};
+
+class stream_redirect_fd {
+ int m_fd;
+
+ // Allow access to the getters.
+ template< class OutStream, class ErrStream > friend
+ child fork(void (*)(void*), OutStream, ErrStream, void*);
+ template< class OutStream, class ErrStream > friend
+ status exec(const tools::fs::path&, const argv_array&,
+ const OutStream&, const ErrStream&, void (*)(void));
+
+ void prepare(void);
+ int connect_parent(void);
+ void connect_child(const int);
+
+public:
+ stream_redirect_fd(const int);
+};
+
+class stream_redirect_path {
+ const tools::fs::path m_path;
+
+ // Allow access to the getters.
+ template< class OutStream, class ErrStream > friend
+ child fork(void (*)(void*), OutStream, ErrStream, void*);
+ template< class OutStream, class ErrStream > friend
+ status exec(const tools::fs::path&, const argv_array&,
+ const OutStream&, const ErrStream&, void (*)(void));
+
+ void prepare(void);
+ int connect_parent(void);
+ void connect_child(const int);
+
+public:
+ stream_redirect_path(const tools::fs::path&);
+};
+
+// ------------------------------------------------------------------------
+// The "status" type.
+// ------------------------------------------------------------------------
+
+class status {
+ int m_status;
+
+ friend class child;
+ template< class OutStream, class ErrStream > friend
+ status exec(const tools::fs::path&, const argv_array&,
+ const OutStream&, const ErrStream&, void (*)(void));
+
+ status(int);
+
+public:
+ ~status(void);
+
+ bool exited(void) const;
+ int exitstatus(void) const;
+
+ bool signaled(void) const;
+ int termsig(void) const;
+ bool coredump(void) const;
+};
+
+// ------------------------------------------------------------------------
+// The "child" type.
+// ------------------------------------------------------------------------
+
+class child {
+ pid_t m_pid;
+
+ int m_stdout;
+ int m_stderr;
+
+ bool m_waited;
+
+ template< class OutStream, class ErrStream > friend
+ child fork(void (*)(void*), OutStream, ErrStream, void*);
+
+ child(const pid_t, const int, const int);
+
+public:
+ ~child(void);
+
+ status wait(void);
+
+ pid_t pid(void) const;
+ int stdout_fd(void);
+ int stderr_fd(void);
+};
+
+// ------------------------------------------------------------------------
+// Free functions.
+// ------------------------------------------------------------------------
+
+namespace detail {
+void flush_streams(void);
+
+struct exec_args {
+ const tools::fs::path m_prog;
+ const argv_array& m_argv;
+ void (*m_prehook)(void);
+};
+
+void do_exec(void *);
+} // namespace detail
+
+// TODO: The void* cookie can probably be templatized, thus also allowing
+// const data structures.
+template< class OutStream, class ErrStream >
+child
+fork(void (*start)(void*), OutStream outsb, ErrStream errsb, void* v)
+{
+ detail::flush_streams();
+
+ outsb.prepare();
+ errsb.prepare();
+
+ pid_t pid = ::fork();
+ if (pid == -1) {
+ throw system_error("tools::process::child::fork",
+ "Failed to fork", errno);
+ } else if (pid == 0) {
+ try {
+ outsb.connect_child(STDOUT_FILENO);
+ errsb.connect_child(STDERR_FILENO);
+ start(v);
+ std::abort();
+ } catch (...) {
+ std::cerr << "Unhandled error while running subprocess\n";
+ std::exit(EXIT_FAILURE);
+ }
+ } else {
+ const int stdout_fd = outsb.connect_parent();
+ const int stderr_fd = errsb.connect_parent();
+ return child(pid, stdout_fd, stderr_fd);
+ }
+}
+
+template< class OutStream, class ErrStream >
+status
+exec(const tools::fs::path& prog, const argv_array& argv,
+ const OutStream& outsb, const ErrStream& errsb,
+ void (*prehook)(void))
+{
+ struct detail::exec_args ea = { prog, argv, prehook };
+ child c = fork(detail::do_exec, outsb, errsb, &ea);
+
+again:
+ try {
+ return c.wait();
+ } catch (const system_error& e) {
+ if (e.code() == EINTR)
+ goto again;
+ else
+ throw e;
+ }
+}
+
+template< class OutStream, class ErrStream >
+status
+exec(const tools::fs::path& prog, const argv_array& argv,
+ const OutStream& outsb, const ErrStream& errsb)
+{
+ return exec(prog, argv, outsb, errsb, NULL);
+}
+
+} // namespace process
+} // namespace tools
+
+#endif // !defined(TOOLS_PROCESS_HPP)
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