* Added "working_directory" option that calls chdir.

* Added "session_on_completion" option which saves the session torrent
when a download finishes.

* Handle SIGTERM gracefully, saving session torrents etc.

* Implemented session directory lockfile, use "session_lock" option to
disable.


git-svn-id: svn://rakshasa.no/libtorrent/trunk/rtorrent@629 e378c898-3ddf-0310-93e7-cc216c733640

src/utils/lockfile.cc

@@ -0,0 +1,75 @@
+// rTorrent - BitTorrent client
+// Copyright (C) 2005-2006, Jari Sundell
+//
+// 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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.
+//
+// Contact:  Jari Sundell <jaris@ifi.uio.no>
+//
+//           Skomakerveien 33
+//           3185 Skoppum, NORWAY
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "lockfile.h"
+
+namespace utils {
+
+bool
+Lockfile::try_lock() {
+  if (m_path.empty()) {
+    m_id = "foo";
+    return true;
+  }
+
+  // Just do a simple locking for now that isn't safe for network
+  // devices.
+  int fd = ::open(m_path.c_str(), O_RDWR | O_CREAT | O_EXCL);
+
+  if (fd == -1)
+    return false;
+
+  m_id = "foo";
+  ::close(fd);
+
+  return true;
+}
+
+bool
+Lockfile::unlock() {
+  if (m_path.empty())
+    return true;
+  else
+    return ::unlink(m_path.c_str()) != -1;
+}
+
+}