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.

3 files changed, 41 insertions, 6 deletions

diff --git a/include/ouroboros/config.h.in b/include/ouroboros/config.h.in
index c11c2d05..7bb4cee0 100644
--- a/include/ouroboros/config.h.in
+++ b/include/ouroboros/config.h.in
@@ -34,12 +34,13 @@
 #define AP_MAX_FLOWS           256
 #define SHM_DU_BUFF_BLOCK_SIZE sysconf(_SC_PAGESIZE)
 #define SHM_DU_MAP_MULTI_BLOCK
-#define SHM_DU_MAP_FILENAME    "ouroboros_du_map"
+#define SHM_DU_MAP_FILENAME    "ouroboros.shm"
+#define LOCKFILE_NAME          "ouroboros.lockfile"
 #define SHM_BLOCKS_IN_MAP      (1 << 14)
 #define SHM_DU_TIMEOUT_MICROS  15000
 #define DU_BUFF_HEADSPACE      128
 #define DU_BUFF_TAILSPACE      0
-#define SHM_AP_RBUFF_PREFIX    "ouroboros_rb_"
+#define SHM_AP_RBUFF_PREFIX    "ouroboros.rbuff."
 #define SHM_RBUFF_SIZE         (1 << 14)
 #define IRMD_MAX_FLOWS         4096
 #define IRMD_THREADPOOL_SIZE   3
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
diff --git a/include/ouroboros/shm_du_map.h b/include/ouroboros/shm_du_map.h
index 59cd94a1..23c0c3aa 100644
--- a/include/ouroboros/shm_du_map.h
+++ b/include/ouroboros/shm_du_map.h
@@ -24,11 +24,9 @@
 #ifndef OUROBOROS_SHM_DU_MAP_H
 #define OUROBOROS_SHM_DU_MAP_H
 
-#include <errno.h>
-#include <unistd.h>
 #include <stdint.h>
-#include <sys/types.h>
 #include <pthread.h>
+#include <sys/types.h>
 
 struct shm_du_buff;
 struct shm_du_map;
@@ -38,7 +36,6 @@ struct shm_du_map * shm_du_map_open();
 void                shm_du_map_close(struct shm_du_map * dum);
 void                shm_du_map_close_on_exit(struct shm_du_map * dum);
 void                shm_du_map_destroy(struct shm_du_map * dum);
-pid_t               shm_du_map_owner(struct shm_du_map * dum);
 void *              shm_du_map_sanitize(void * o);
 
 /* returns the index of the buffer in the DU map */