lib: shared memory map

The shared memory map will allow passing SDU's between IPCPs
efficiently. It is a single block of managed memory. SDU's are stored
in a shm_du_buff datastructure, which is a list of blocks inside the
shared memory region. The mechanism for passing SDU's is not yet
implemented and could be either within the region or using another
local IPC mechanism.

The following things are configured at compile time:

SHM_FILE_NAME         : the name. Default is "ouroboros_du_map".
SHM_DU_BUFF_BLOCK_SIZE: size of a block inside the shared memory
                        region. Default is the pagesize of the system.
SHM_DU_MAP_SIZE       : the approximate size in bytes of the shared
                        memory map. The actual filesize may differ by
                        a small margin. Default is 4MB.

1 files changed, 51 insertions, 0 deletions

diff --git a/src/lib/tests/shm_du_map_test_create.c b/src/lib/tests/shm_du_map_test_create.c
new file mode 100644
index 00000000..dcf3bd45
--- /dev/null
+++ b/src/lib/tests/shm_du_map_test_create.c
@@ -0,0 +1,51 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Test of the Shared Memory Map
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/shm_du_map.h>
+#include <ouroboros/common.h>
+#include <sys/mman.h>
+
+int shm_du_map_test_create(int argc, char ** argv)
+{
+        struct shm_du_map * dum;
+        struct shm_du_map * dum2;
+
+        shm_unlink(SHM_DU_MAP_FILENAME);
+
+        dum = shm_du_map_create();
+
+        if (dum == NULL)
+                return -1;
+
+        dum2 = shm_du_map_open();
+
+        if (dum2 == NULL) {
+                shm_du_map_close(dum);
+                return 1;
+        }
+
+        shm_du_map_close(dum2);
+
+        shm_du_map_close(dum);
+
+        return 0; /* tests succeeded */
+}