irmd: use the shm_du_map as a uniqueness check

This makes sure only one shm_du_map is running in the system.
Starting a second irmd would invalidate the shared memory map.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/irmd/main.c b/src/irmd/main.c
index a33fae84..b84c3327 100644
--- a/src/irmd/main.c
+++ b/src/irmd/main.c
@@ -1487,8 +1487,13 @@ static struct irm * irm_create()
         if (i == NULL)
                 return NULL;
 
-        if (access("/dev/shm/" SHM_DU_MAP_FILENAME, F_OK) != -1)
-                unlink("/dev/shm/" SHM_DU_MAP_FILENAME);
+        if (access("/dev/shm/" SHM_DU_MAP_FILENAME, F_OK) != -1) {
+                LOG_ERR("IRM daemon is running in this system.");
+                LOG_ERR("If you think this message is in error,");
+                LOG_ERR("please remove /dev/shm/" SHM_DU_MAP_FILENAME);
+                LOG_ERR("(root privileges required) or reboot your system.");
+                return NULL;
+        }
 
         i->threadpool = malloc(sizeof(pthread_t) * IRMD_THREADPOOL_SIZE);
         if (i->threadpool == NULL) {