src: add helpers for common clinet/service side utils

src/helpers.h

@@ -0,0 +1,42 @@
+/* helpers.h
+ *
+ * Copyright 2019 Christian Hergert <chergert@redhat.com>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <gio/gio.h>
+#ifdef __linux__
+# include <linux/perf_event.h>
+#endif
+
+G_BEGIN_DECLS
+
+gboolean helpers_list_processes  (gint32   **processes,
+                                  gsize     *n_processes);
+gboolean helpers_perf_event_open (GVariant  *options,
+                                  gint32     pid,
+                                  gint32     cpu,
+                                  gint       group_fd,
+                                  guint64    flags,
+                                  gint      *out_fd);
+gboolean helpers_get_proc_file   (const gchar  *path,
+                                  gchar       **contents,
+                                  gsize        *len);
+
+G_END_DECLS