core: combine common session management utility code

And reformat the systemd session manager for NM code style.

src/nm-session-utils.h

@@ -0,0 +1,41 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
+/* 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.
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ * Author: Dan Williams <dcbw@redhat.com>
+ */
+
+#ifndef NM_SESSION_UTILS_H
+#define NM_SESSION_UTILS_H
+
+#include <glib.h>
+#include <glib-object.h>
+
+#define NM_SESSION_MONITOR_ERROR         (nm_session_monitor_error_quark ())
+GQuark nm_session_monitor_error_quark    (void) G_GNUC_CONST;
+GType  nm_session_monitor_error_get_type (void) G_GNUC_CONST;
+
+typedef enum {
+	NM_SESSION_MONITOR_ERROR_IO_ERROR = 0,
+	NM_SESSION_MONITOR_ERROR_MALFORMED_DATABASE,
+	NM_SESSION_MONITOR_ERROR_UNKNOWN_USER,
+	NM_SESSION_MONITOR_ERROR_NO_DATABASE,
+} NMSessionMonitorError;
+
+gboolean nm_session_uid_to_user (uid_t uid, const char **out_user, GError **error);
+
+gboolean nm_session_user_to_uid (const char *user, uid_t *out_uid, GError **error);
+
+#endif  /* NM_SESSION_UTILS_H */