Merge pull request #83 from daniel-baumann/master

Creating /dev/shm if its not existing, otherwise haveged fails to start.

src/haveged.c

@@ -489,7 +489,13 @@ int main(int argc, char **argv)
             fprintf(stderr, "%s: disabling command mode for this instance\n", params->daemon);
          }
       }
-      /* Initilize named semaphore to synchronize command instances */
+      /* Initialize named semaphore to synchronize command instances */
+      if (mkdir("/dev/shm", 0755) != 0) {
+        if (errno != EEXIST) {
+          error_exit("Couldn't create /dev/shm directory: %s", strerror(errno));
+        }
+      }
+
       sem = sem_open(SEM_NAME, O_CREAT, 0644, 1);
       if (sem == NULL) {
          fprintf(stderr, "Warning: Couldn't create named semaphore " SEM_NAME" error: %s", strerror(errno));