lib: shm_du_map: Clean sdus upon exit

When an application closes the shm_du_map, it will clean all remaining
sdu's for that application. Adds a function to clean the shm_du_map on
close.

Fixes #20.

3 files changed, 31 insertions, 5 deletions

diff --git a/src/lib/dev.c b/src/lib/dev.c
index d85afc45..f13c8423 100644
--- a/src/lib/dev.c
+++ b/src/lib/dev.c
@@ -113,10 +113,10 @@ void ap_fini(void)
 
         if (_ap_instance->fds != NULL)
                 bmp_destroy(_ap_instance->fds);
-        if (_ap_instance->dum != NULL)
-                shm_du_map_close(_ap_instance->dum);
         if (_ap_instance->rb != NULL)
                 shm_ap_rbuff_destroy(_ap_instance->rb);
+        if (_ap_instance->dum != NULL)
+                shm_du_map_close_on_exit(_ap_instance->dum);
 
         pthread_rwlock_rdlock(&_ap_instance->flows_lock);
 
diff --git a/src/lib/shm_ap_rbuff.c b/src/lib/shm_ap_rbuff.c
index e90afe19..4eb91136 100644
--- a/src/lib/shm_ap_rbuff.c
+++ b/src/lib/shm_ap_rbuff.c
@@ -36,6 +36,7 @@
 #include <stdint.h>
 #include <unistd.h>
 #include <errno.h>
+#include <signal.h>
 #include <sys/stat.h>
 
 #define SHM_RBUFF_FILE_SIZE (SHM_RBUFF_SIZE * sizeof(struct rb_entry)          \
@@ -161,7 +162,7 @@ struct shm_ap_rbuff * shm_ap_rbuff_open(pid_t api)
 
         shm_fd = shm_open(fn, O_RDWR, 0666);
         if (shm_fd == -1) {
-                LOG_DBGF("Failed opening shared memory %s.", fn);
+                LOG_DBGF("%d failed opening shared memory %s.", getpid(), fn);
                 return NULL;
         }
 
diff --git a/src/lib/shm_du_map.c b/src/lib/shm_du_map.c
index 6289857f..68452158 100644
--- a/src/lib/shm_du_map.c
+++ b/src/lib/shm_du_map.c
@@ -123,8 +123,10 @@ static void clean_sdus(struct shm_du_map * dum, pid_t api)
         if (kill(api, 0) == 0) {
                 struct shm_ap_rbuff * rb;
                 rb = shm_ap_rbuff_open(api);
-                shm_ap_rbuff_reset(rb);
-                shm_ap_rbuff_close(rb);
+                if (rb != NULL) {
+                        shm_ap_rbuff_reset(rb);
+                        shm_ap_rbuff_close(rb);
+                }
         }
 
         *dum->choked = 0;
@@ -347,6 +349,24 @@ void * shm_du_map_sanitize(void * o)
         return (void *) 0;
 }
 
+void shm_du_map_close_on_exit(struct shm_du_map * dum)
+{
+        if (dum == NULL) {
+                LOG_DBGF("Bogus input. Bugging out.");
+                return;
+        }
+
+        clean_sdus(dum, getpid());
+
+        if (close(dum->fd) < 0)
+                LOG_DBGF("Couldn't close shared memory.");
+
+        if (munmap(dum->shm_base, SHM_FILE_SIZE) == -1)
+                LOG_DBGF("Couldn't unmap shared memory.");
+
+        free(dum);
+}
+
 void shm_du_map_close(struct shm_du_map * dum)
 {
         if (dum == NULL) {
@@ -370,6 +390,11 @@ void shm_du_map_destroy(struct shm_du_map * dum)
                 return;
         }
 
+        if (getpid() != *dum->api) {
+                LOG_DBGF("Only IRMd can destroy %s.", SHM_DU_MAP_FILENAME);
+                return;
+        }
+
         if (close(dum->fd) < 0)
                 LOG_DBGF("Couldn't close shared memory.");