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, 2 insertions, 8 deletions

diff --git a/src/lib/shm_du_map.c b/src/lib/shm_du_map.c
index 53959676..01d1e23d 100644
--- a/src/lib/shm_du_map.c
+++ b/src/lib/shm_du_map.c
@@ -29,9 +29,11 @@
 #include <pthread.h>
 #include <sys/mman.h>
 #include <fcntl.h>
+#include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <signal.h>
+#include <errno.h>
 #include <sys/stat.h>
 
 #define OUROBOROS_PREFIX "shm_du_map"
@@ -270,14 +272,6 @@ struct shm_du_map * shm_du_map_open()
         return dum;
 }
 
-pid_t shm_du_map_owner(struct shm_du_map * dum)
-{
-        if (dum == NULL)
-                return -1;
-
-        return *dum->api;
-}
-
 void * shm_du_map_sanitize(void * o)
 {
         struct shm_du_map * dum = (struct shm_du_map *) o;