lib: Add lockfile

The pid of the IRMd is stored in a lockfile in shared memory. This
makes checking if the IRMd is running independent of the
configuration, as previously the IRMd pid was stored at the end of the
shm_du_map, which could not be read by an IRMd that would be compiled
with different configuration options.

Also corrects some unnecessary includes

Fixes #21.

1 files changed, 37 insertions, 0 deletions

diff --git a/include/ouroboros/lockfile.h b/include/ouroboros/lockfile.h
new file mode 100644
index 00000000..c2cf4572
--- /dev/null
+++ b/include/ouroboros/lockfile.h
@@ -0,0 +1,37 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Lockfile for ouroboros system
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef OUROBOROS_LOCKFILE_H
+#define OUROBOROS_LOCKFILE_H
+
+#include <sys/types.h>
+
+struct lockfile;
+
+struct lockfile * lockfile_create();
+struct lockfile * lockfile_open();
+void              lockfile_close(struct lockfile * lf);
+void              lockfile_destroy(struct lockfile * lf);
+
+pid_t             lockfile_owner(struct lockfile * lf);
+
+#endif