diff --git a/src/Context.cc b/src/Context.cc
index da23982d..7543a28f 100644
--- a/src/Context.cc
+++ b/src/Context.cc
@@ -175,14 +175,16 @@ void showFiles
 } // namespace
 #endif // ENABLE_BITTORRENT || ENABLE_METALINK
 
-extern void option_processing(Option& option, std::vector<std::string>& uris,
-                              int argc, char* argv[]);
+extern void option_processing(Option& option, bool standalone,
+                              std::vector<std::string>& uris,
+                              int argc, char** argv, const KeyVals& options);
 
-Context::Context(int argc, char** argv)
+Context::Context(bool standalone,
+                 int argc, char** argv, const KeyVals& options)
 {
   std::vector<std::string> args;
   SharedHandle<Option> op(new Option());
-  option_processing(*op.get(), args, argc, argv);
+  option_processing(*op.get(), standalone, args, argc, argv, options);
 
   SimpleRandomizer::init();
 #ifdef ENABLE_BITTORRENT
@@ -281,7 +283,8 @@ Context::Context(int argc, char** argv)
     i->remove(PREF_CHECKSUM);
     i->remove(PREF_GID);
   }
-  if(!op->getAsBool(PREF_ENABLE_RPC) && requestGroups.empty() &&
+  if(standalone &&
+     !op->getAsBool(PREF_ENABLE_RPC) && requestGroups.empty() &&
      !uriListParser) {
     global::cout()->printf("%s\n", MSG_NO_FILES_TO_DOWNLOAD);
   } else {
diff --git a/src/Context.h b/src/Context.h
index 7a873bdd..061c9969 100644
--- a/src/Context.h
+++ b/src/Context.h
@@ -36,6 +36,7 @@
 #define CONTEXT_H
 
 #include "common.h"
+#include <aria2/aria2.h>
 #include "SharedHandle.h"
 
 namespace aria2 {
@@ -43,7 +44,12 @@ namespace aria2 {
 class MultiUrlRequestInfo;
 
 struct Context {
-  Context(int argc, char** argv);
+  // Set the |standalone| false if the context is created via libaria2
+  // API. The |argc| and |argv| is expected to the command-line
+  // arguments, which will be passed to getopt_long(3) in the end.
+  // The |options| is the additional option values and is considered
+  // as a part of command-line arguments.
+  Context(bool standalone, int argc, char** argv, const KeyVals& options);
   ~Context();
   SharedHandle<MultiUrlRequestInfo> reqinfo;
 };
diff --git a/src/DownloadEngine.cc b/src/DownloadEngine.cc
index 0f266b58..4df4aed1 100644
--- a/src/DownloadEngine.cc
+++ b/src/DownloadEngine.cc
@@ -88,6 +88,7 @@ DownloadEngine::DownloadEngine(const SharedHandle<EventPoll>& eventPoll)
     haltRequested_(0),
     noWait_(true),
     refreshInterval_(DEFAULT_REFRESH_INTERVAL),
+    lastRefresh_(0),
     cookieStorage_(new CookieStorage()),
 #ifdef ENABLE_BITTORRENT
     btRegistry_(new BtRegistry()),
@@ -141,8 +142,6 @@ void executeCommand(std::deque<Command*>& commands,
 
 int DownloadEngine::run(bool oneshot)
 {
-  Timer cp;
-  cp.reset(0);
   while(!commands_.empty() || !routineCommands_.empty()) {
     if(!commands_.empty()) {
       waitData();
@@ -150,17 +149,17 @@ int DownloadEngine::run(bool oneshot)
     noWait_ = false;
     global::wallclock().reset();
     calculateStatistics();
-    if(cp.differenceInMillis(global::wallclock())+A2_DELTA_MILLIS >=
+    if(lastRefresh_.differenceInMillis(global::wallclock())+A2_DELTA_MILLIS >=
        refreshInterval_) {
       refreshInterval_ = DEFAULT_REFRESH_INTERVAL;
-      cp = global::wallclock();
+      lastRefresh_ = global::wallclock();
       executeCommand(commands_, Command::STATUS_ALL);
     } else {
       executeCommand(commands_, Command::STATUS_ACTIVE);
     }
     executeCommand(routineCommands_, Command::STATUS_ALL);
     afterEachIteration();
-    if(oneshot) {
+    if(!noWait_ && oneshot) {
       return 1;
     }
   }
diff --git a/src/DownloadEngine.h b/src/DownloadEngine.h
index f382a6c1..ff14a93e 100644
--- a/src/DownloadEngine.h
+++ b/src/DownloadEngine.h
@@ -124,6 +124,7 @@ private:
 
   // Milliseconds
   int64_t refreshInterval_;
+  Timer lastRefresh_;
 
   std::deque<Command*> routineCommands_;
 
diff --git a/src/Makefile.am b/src/Makefile.am
index ef4ff62b..72fae525 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,9 +1,10 @@
 SUBDIRS = includes
 bin_PROGRAMS = aria2c
-aria2c_SOURCES = main.cc\
-	version_usage.cc
+aria2c_SOURCES = main.cc
 SRCS =  option_processing.cc\
+	version_usage.cc\
 	Context.cc Context.h\
+	aria2api.cc aria2api.h\
 	SocketCore.cc SocketCore.h\
 	BinaryStream.h\
 	Command.cc Command.h\
@@ -632,15 +633,18 @@ SRCS += KqueueEventPoll.cc KqueueEventPoll.h
 endif # HAVE_KQUEUE
 
 AR = @AR@
-noinst_LTLIBRARIES = libaria2c.la
-libaria2c_la_SOURCES = $(SRCS)
-libaria2c_la_LIBADD = @WSLAY_LIBS@
-aria2c_LDADD = libaria2c.la @LIBINTL@ @ALLOCA@ #-lprofiler
+
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = libaria2.pc
+DISTCLEANFILES = $(pkgconfig_DATA)
+
+lib_LTLIBRARIES = libaria2.la
+libaria2_la_SOURCES = $(SRCS)
+libaria2_la_LIBADD = @WSLAY_LIBS@
+
+LDADD = libaria2.la @LIBINTL@ @ALLOCA@ #-lprofiler
 #aria2c_LDFLAGS = -pg
 AM_CPPFLAGS =  -Wall\
 	-I$(top_srcdir)/lib -I$(top_srcdir)/intl\
+	-I$(srcdir)/includes -I$(builddir)/includes\
 	-DLOCALEDIR=\"@localedir@\" -DCA_BUNDLE=\"$(ca_bundle)\" @DEFS@ #-pg
-
-lib_LTLIBRARIES = libaria2.la
-libaria2_la_SOURCES =
-libaria2_la_LIBADD = libaria2c.la
diff --git a/src/MultiUrlRequestInfo.cc b/src/MultiUrlRequestInfo.cc
index 3f2b3e9f..5746b748 100644
--- a/src/MultiUrlRequestInfo.cc
+++ b/src/MultiUrlRequestInfo.cc
@@ -128,7 +128,7 @@ void MultiUrlRequestInfo::printMessageForContinue()
      _("If there are any errors, then see the log file. See '-l' option in help/man page for details."));
 }
 
-error_code::Value MultiUrlRequestInfo::prepare()
+int MultiUrlRequestInfo::prepare()
 {
   try {
     SharedHandle<rpc::WebSocketSessionMan> wsSessionMan;
@@ -259,9 +259,9 @@ error_code::Value MultiUrlRequestInfo::prepare()
   } catch(RecoverableException& e) {
     SingletonHolder<Notifier>::clear();
     resetSignalHandlers();
-    return error_code::UNKNOWN_ERROR;
+    return -1;
   }
-  return error_code::FINISHED;
+  return 0;
 }
 
 error_code::Value MultiUrlRequestInfo::getResult()
@@ -306,30 +306,19 @@ error_code::Value MultiUrlRequestInfo::getResult()
   return returnValue;
 }
 
-int MultiUrlRequestInfo::run()
-{
-  int rv;
-  try {
-    rv = e_->run(true);
-  } catch(RecoverableException& e) {
-    rv = -1;
-  }
-  return rv;
-}
-
 error_code::Value MultiUrlRequestInfo::execute()
 {
-  error_code::Value returnValue;
-  returnValue = prepare();
-  if(returnValue != error_code::FINISHED) {
-    return returnValue;
+  if(prepare() != 0) {
+    return error_code::UNKNOWN_ERROR;
   }
+  // TODO Enclosed in try..catch block for just in case. Really need
+  // this?
   try {
     e_->run();
   } catch(RecoverableException& e) {
     A2_LOG_ERROR_EX(EX_EXCEPTION_CAUGHT, e);
   }
-  returnValue = getResult();
+  error_code::Value returnValue = getResult();
   resetSignalHandlers();
   return returnValue;
 }
@@ -346,4 +335,10 @@ void MultiUrlRequestInfo::resetSignalHandlers()
   util::setGlobalSignalHandler(SIGTERM, &mask_, SIG_DFL, 0);
 }
 
+const SharedHandle<DownloadEngine>&
+MultiUrlRequestInfo::getDownloadEngine() const
+{
+  return e_;
+}
+
 } // namespace aria2
diff --git a/src/MultiUrlRequestInfo.h b/src/MultiUrlRequestInfo.h
index 0d6b7377..1d0176dd 100644
--- a/src/MultiUrlRequestInfo.h
+++ b/src/MultiUrlRequestInfo.h
@@ -86,19 +86,25 @@ public:
 
   virtual ~MultiUrlRequestInfo();
 
-  /**
-   * Returns FINISHED if all downloads have completed, otherwise returns the
-   * last download result.
-   */
+  // Returns FINISHED if all downloads have completed, otherwise returns the
+  // last download result.
+  //
+  // This method actually calls prepare() and
+  // getDownloadEngine()->run(true) and getResult().
   error_code::Value execute();
 
-  error_code::Value prepare();
+  // Performs preparations for downloads, including creating
+  // DownloadEngine instance. This function returns 0 if it succeeds,
+  // or -1.
+  int prepare();
+
+  // Performs finalization of download process, including saving
+  // sessions. This function returns last error code in this session,
+  // in particular, this function returns FINISHED if all downloads
+  // have completed.
   error_code::Value getResult();
-  // Returns 1 if the caller needs to call this function one or more
-  // time. Returns 0 if the function succeeds. Returns -1 on error.
-  // For return value 0 and -1, the caller must call tearDown() to get
-  // final error code.
-  int run();
+
+  const SharedHandle<DownloadEngine>& getDownloadEngine() const;
 };
 
 } // namespace aria2
diff --git a/src/OptionParser.cc b/src/OptionParser.cc
index 8aed0259..efa01514 100644
--- a/src/OptionParser.cc
+++ b/src/OptionParser.cc
@@ -245,6 +245,21 @@ void OptionParser::parse(Option& option, std::istream& is) const
   }
 }
 
+void OptionParser::parse(Option& option, const KeyVals& options) const
+{
+  std::string line;
+  for(KeyVals::const_iterator i = options.begin(), eoi = options.end();
+      i != eoi; ++i) {
+    const Pref* pref = option::k2p((*i).first);
+    const OptionHandler* handler = find(pref);
+    if(handler) {
+      handler->parse(option, (*i).second);
+    } else {
+      A2_LOG_WARN(fmt("Unknown option: %s", line.c_str()));
+    }
+  }
+}
+
 void OptionParser::setOptionHandlers
 (const std::vector<OptionHandler*>& handlers)
 {
diff --git a/src/OptionParser.h b/src/OptionParser.h
index 2cd9f8e7..4f7d11a5 100644
--- a/src/OptionParser.h
+++ b/src/OptionParser.h
@@ -41,6 +41,7 @@
 #include <vector>
 #include <iosfwd>
 
+#include <aria2/aria2.h>
 #include "SharedHandle.h"
 
 namespace aria2 {
@@ -67,6 +68,8 @@ public:
 
   void parse(Option& option, std::istream& ios) const;
 
+  void parse(Option& option, const KeyVals& options) const;
+
   void parseDefaultValues(Option& option) const;
 
   void setOptionHandlers
diff --git a/src/aria2api.cc b/src/aria2api.cc
new file mode 100644
index 00000000..0d1e984a
--- /dev/null
+++ b/src/aria2api.cc
@@ -0,0 +1,185 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2013 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#include "aria2api.h"
+
+#include <functional>
+
+#include "Platform.h"
+#include "Context.h"
+#include "DownloadEngine.h"
+#include "OptionParser.h"
+#include "Option.h"
+#include "DlAbortEx.h"
+#include "fmt.h"
+#include "OptionHandler.h"
+#include "RequestGroupMan.h"
+#include "RequestGroup.h"
+#include "MultiUrlRequestInfo.h"
+#include "prefs.h"
+#include "download_helper.h"
+#include "LogFactory.h"
+
+namespace aria2 {
+
+Session::Session(const KeyVals& options)
+  : context(new Context(false, 0, 0, options))
+{}
+
+Session::~Session()
+{}
+
+namespace {
+Platform* platform = 0;
+} // namespace
+
+int libraryInit()
+{
+  platform = new Platform();
+  return 0;
+}
+
+int libraryDeinit()
+{
+  delete platform;
+  return 0;
+}
+
+Session* sessionNew(const KeyVals& options)
+{
+  int rv;
+  Session* session = new Session(options);
+  if(session->context->reqinfo) {
+    rv = session->context->reqinfo->prepare();
+    if(rv != 0) {
+      delete session;
+      session = 0;
+    }
+  } else {
+    delete session;
+    session = 0;
+  }
+  return session;
+}
+
+int sessionFinal(Session* session)
+{
+  error_code::Value rv = session->context->reqinfo->getResult();
+  delete session;
+  return rv;
+}
+
+int run(Session* session, RUN_MODE mode)
+{
+  const SharedHandle<DownloadEngine>& e =
+    session->context->reqinfo->getDownloadEngine();
+  return e->run(mode == RUN_ONCE);
+}
+
+namespace {
+template<typename InputIterator, typename Pred>
+void apiGatherOption
+(InputIterator first, InputIterator last,
+ Pred pred,
+ Option* option,
+ const SharedHandle<OptionParser>& optionParser)
+{
+  for(; first != last; ++first) {
+    const std::string& optionName = (*first).first;
+    const Pref* pref = option::k2p(optionName);
+    if(!pref) {
+      throw DL_ABORT_EX
+        (fmt("We don't know how to deal with %s option", optionName.c_str()));
+    }
+    const OptionHandler* handler = optionParser->find(pref);
+    if(!handler || !pred(handler)) {
+      // Just ignore the unacceptable options in this context.
+      continue;
+    }
+    handler->parse(*option, (*first).second);
+  }
+}
+} // namespace
+
+namespace {
+void apiGatherRequestOption(Option* option, const KeyVals& options,
+                            const SharedHandle<OptionParser>& optionParser)
+{
+  apiGatherOption(options.begin(), options.end(),
+                  std::mem_fun(&OptionHandler::getInitialOption),
+                  option, optionParser);
+}
+} // namespace
+
+namespace {
+void addRequestGroup(const SharedHandle<RequestGroup>& group,
+                     const SharedHandle<DownloadEngine>& e,
+                     int position)
+{
+  if(position >= 0) {
+    e->getRequestGroupMan()->insertReservedGroup(position, group);
+  } else {
+    e->getRequestGroupMan()->addReservedGroup(group);
+  }
+}
+} // namespace
+
+int addUri(Session* session,
+           A2Gid& gid,
+           const std::vector<std::string>& uris,
+           const KeyVals& options,
+           int position)
+{
+  const SharedHandle<DownloadEngine>& e =
+    session->context->reqinfo->getDownloadEngine();
+  SharedHandle<Option> requestOption(new Option(*e->getOption()));
+  try {
+    apiGatherRequestOption(requestOption.get(), options,
+                           OptionParser::getInstance());
+  } catch(RecoverableException& e) {
+    A2_LOG_INFO_EX(EX_EXCEPTION_CAUGHT, e);
+    return -1;
+  }
+  std::vector<SharedHandle<RequestGroup> > result;
+  createRequestGroupForUri(result, requestOption, uris,
+                           /* ignoreForceSeq = */ true,
+                           /* ignoreLocalPath = */ true);
+  if(!result.empty()) {
+    gid = result.front()->getGID();
+    addRequestGroup(result.front(), e, position);
+  }
+  return 0;
+}
+
+} // namespace aria2
diff --git a/src/aria2api.h b/src/aria2api.h
new file mode 100644
index 00000000..29fe529e
--- /dev/null
+++ b/src/aria2api.h
@@ -0,0 +1,55 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2013 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef ARIA2_API_H
+#define ARIA2_API_H
+
+#include "common.h"
+
+#include <aria2/aria2.h>
+#include "SharedHandle.h"
+
+namespace aria2 {
+
+struct Context;
+
+struct Session {
+  Session(const KeyVals& options);
+  ~Session();
+  SharedHandle<Context> context;
+};
+
+} // namespace aria2
+
+#endif // ARIA2_API_H
diff --git a/src/includes/Makefile.am b/src/includes/Makefile.am
index e69de29b..d270bef8 100644
--- a/src/includes/Makefile.am
+++ b/src/includes/Makefile.am
@@ -0,0 +1 @@
+nobase_include_HEADERS = aria2/aria2.h
diff --git a/src/includes/aria2/aria2.h b/src/includes/aria2/aria2.h
new file mode 100644
index 00000000..625c1ec3
--- /dev/null
+++ b/src/includes/aria2/aria2.h
@@ -0,0 +1,113 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2013 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef ARIA2_H
+#define ARIA2_H
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <string>
+#include <vector>
+
+namespace aria2 {
+
+struct Session;
+
+// Initializes the global data. It also initializes
+// underlying libraries libaria2 depends on. This function returns 0
+// if it succeeds, or -1.
+int libraryInit();
+
+// Releases the global data. This function returns 0 if
+// it succeeds, or -1.
+int libraryDeinit();
+
+// type of GID
+typedef uint64_t A2Gid;
+
+// type of Key/Value pairs
+typedef std::vector<std::pair<std::string, std::string> > KeyVals;
+
+// Creates new Session object using the |options| as additional
+// parameters. The |options| is treated as if they are specified in
+// command-line to aria2c(1). This function returns the pointer to the
+// newly created Session object if it succeeds, or NULL.
+Session* sessionNew(const KeyVals& options);
+
+// Performs post-download action, including saving sessions etc and
+// destroys the |session| object, releasing the allocated resources
+// for it. This function returns the last error code and it is the
+// equivalent to the exit status of aria2c(1).
+int sessionFinal(Session* session);
+
+enum RUN_MODE {
+  RUN_DEFAULT,
+  RUN_ONCE
+};
+
+// Performs event polling and actions for them. If the |mode| is
+// RUN_DEFAULT, this function returns when no downloads are left to be
+// processed. In this case, this function returns 0.
+//
+// If the |mode| is RUN_ONCE, this function returns after one event
+// polling. In the current implementation, event polling timeouts in 1
+// second, so this function returns at most 1 second. On return, when
+// no downloads are left to be processed, this function returns
+// 0. Otherwise, returns 1, indicating that the caller must call this
+// function one or more time to complete downloads.
+int run(Session* session, RUN_MODE mode);
+
+// This method adds new HTTP(S)/FTP/BitTorrent Magnet URI.  On
+// successful return, the |gid| includes the GID of newly added
+// download.  The |uris| includes URI to be downloaded.  For
+// BitTorrent Magnet URI, the |uris| must have only one element and it
+// should be BitTorrent Magnet URI. URIs in uris must point to the
+// same file. If you mix other URIs which point to another file, aria2
+// does not complain but download may fail. The |options| is a pair of
+// option name and value. If the |position| is not negative integer,
+// the new download is inserted at position in the waiting queue. If
+// the |position| is negative or the |position| is larger than the
+// size of the queue, it is appended at the end of the queue.  This
+// function returns 0 if it succeeds, or -1.
+int addUri(Session* session,
+           A2Gid& gid,
+           const std::vector<std::string>& uris,
+           const KeyVals& options,
+           int position = -1);
+
+} // namespace aria2
+
+#endif // ARIA2_H
diff --git a/src/main.cc b/src/main.cc
index 47968f2e..ebb7e9de 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -36,6 +36,7 @@
 
 #include <unistd.h>
 
+#include <aria2/aria2.h>
 #include "SharedHandle.h"
 #include "Context.h"
 #include "MultiUrlRequestInfo.h"
@@ -48,7 +49,7 @@ namespace aria2 {
 
 error_code::Value main(int argc, char** argv)
 {
-  Context context(argc, argv);
+  Context context(true, argc, argv, KeyVals());
   error_code::Value exitStatus = error_code::FINISHED;
   if(context.reqinfo) {
     exitStatus = context.reqinfo->execute();
diff --git a/src/option_processing.cc b/src/option_processing.cc
index 98ea844f..53689d13 100644
--- a/src/option_processing.cc
+++ b/src/option_processing.cc
@@ -38,6 +38,7 @@
 #include <cstring>
 #include <sstream>
 
+#include <aria2/aria2.h>
 #include "Option.h"
 #include "prefs.h"
 #include "OptionParser.h"
@@ -189,8 +190,9 @@ void optionNativeToUtf8(Option& op)
 } // namespace
 #endif // __MINGW32__
 
-void option_processing(Option& op, std::vector<std::string>& uris,
-                       int argc, char* argv[])
+void option_processing(Option& op, bool standalone,
+                       std::vector<std::string>& uris,
+                       int argc, char** argv, const KeyVals& options)
 {
   const SharedHandle<OptionParser>& oparser = OptionParser::getInstance();
   try {
@@ -279,6 +281,7 @@ void option_processing(Option& op, std::vector<std::string>& uris,
     // finaly let's parse and store command-iine options.
     op.setParent(confOption);
     oparser->parse(op, cmdstream);
+    oparser->parse(op, options);
 #ifdef __MINGW32__
     optionNativeToUtf8(op);
     optionNativeToUtf8(*confOption);
@@ -301,7 +304,8 @@ void option_processing(Option& op, std::vector<std::string>& uris,
     showUsage("", oparser, global::cerr());
     exit(e.getErrorCode());
   }
-  if(!op.getAsBool(PREF_ENABLE_RPC) &&
+  if(standalone &&
+     !op.getAsBool(PREF_ENABLE_RPC) &&
 #ifdef ENABLE_BITTORRENT
      op.blank(PREF_TORRENT_FILE) &&
 #endif // ENABLE_BITTORRENT
diff --git a/test/Makefile.am b/test/Makefile.am
index 68a843ad..2ba15b50 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -237,9 +237,10 @@ if !HAVE_TIMEGM
 aria2c_SOURCES += TimegmTest.cc
 endif # !HAVE_TIMEGM
 
-aria2c_LDADD = ../src/libaria2c.la @LIBINTL@ @CPPUNIT_LIBS@
+aria2c_LDADD = ../src/libaria2.la @LIBINTL@ @CPPUNIT_LIBS@
 AM_CPPFLAGS =  -Wall\
 	-I$(top_srcdir)/src\
+	-I$(top_srcdir)/src/includes -I$(top_builddir)/src/includes\
 	-I$(top_srcdir)/lib -I$(top_srcdir)/intl\
         -DLOCALEDIR=\"$(localedir)\"\
 	-DA2_TEST_DIR=\"$(top_srcdir)/test\"\
diff --git a/test/OptionParserTest.cc b/test/OptionParserTest.cc
index db100102..31aaf93c 100644
--- a/test/OptionParserTest.cc
+++ b/test/OptionParserTest.cc
@@ -27,6 +27,7 @@ class OptionParserTest:public CppUnit::TestFixture {
   CPPUNIT_TEST(testParseDefaultValues);
   CPPUNIT_TEST(testParseArg);
   CPPUNIT_TEST(testParse);
+  CPPUNIT_TEST(testParseKeyVals);
   CPPUNIT_TEST_SUITE_END();
 private:
   SharedHandle<OptionParser> oparser_;
@@ -73,6 +74,7 @@ public:
   void testParseDefaultValues();
   void testParseArg();
   void testParse();
+  void testParseKeyVals();
 };
 
 
@@ -195,4 +197,16 @@ void OptionParserTest::testParse()
   CPPUNIT_ASSERT_EQUAL(std::string("World"), option.get(PREF_DIR));
 }
 
+void OptionParserTest::testParseKeyVals()
+{
+  Option option;
+  KeyVals kv;
+  kv.push_back(std::make_pair("timeout", "Hello"));
+  kv.push_back(std::make_pair("UNKNOWN", "x"));
+  kv.push_back(std::make_pair("dir", "World"));
+  oparser_->parse(option, kv);
+  CPPUNIT_ASSERT_EQUAL(std::string("Hello"), option.get(PREF_TIMEOUT));
+  CPPUNIT_ASSERT_EQUAL(std::string("World"), option.get(PREF_DIR));
+}
+
 } // namespace aria2