lib: Unlink old flow set shared memory

This unlinks previously allocated flow set shared memory. It could be
lingering in case an application with the same pid was SIGKILLED, and
didn't clean up its flow set shared memory.

Signed-off-by: Sander Vrijders <sander.vrijders@ugent.be>
Signed-off-by: Dimitri Staessens <dimitri.staessens@ugent.be>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/lib/shm_flow_set.c b/src/lib/shm_flow_set.c
index 9d0e6c83..ca3a1a87 100644
--- a/src/lib/shm_flow_set.c
+++ b/src/lib/shm_flow_set.c
@@ -84,9 +84,13 @@ struct shm_flow_set * shm_flow_set_create()
         mode_t                mask;
         int                   shm_fd;
         int                   i;
+        struct stat           st;
 
         sprintf(fn, SHM_FLOW_SET_PREFIX "%d", getpid());
 
+        if (stat(fn, &st) != -1 && unlink(fn))
+                return NULL;
+
         set = malloc(sizeof(*set));
         if (set == NULL)
                 return NULL;