lib: api for handling flows

moved the flow definition to the library and made it public.
thread-safety implemented without compiler checks.

2 files changed, 78 insertions, 0 deletions

diff --git a/src/lib/CMakeLists.txt b/src/lib/CMakeLists.txt
index 42a4d5c0..7a78bf3e 100644
--- a/src/lib/CMakeLists.txt
+++ b/src/lib/CMakeLists.txt
@@ -21,6 +21,7 @@ set(SOURCE_FILES
         da.c
         dev.c
         du_buff.c
+        flow.c
         ipcp.c
         irm.c
         list.c
diff --git a/src/lib/flow.c b/src/lib/flow.c
new file mode 100644
index 00000000..67b8e71b
--- /dev/null
+++ b/src/lib/flow.c
@@ -0,0 +1,77 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Flows
+ *
+ *    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 <malloc.h>
+#include <ouroboros/flow.h>
+
+#define OUROBOROS_PREFIX "ipcpd/flow"
+
+#include <ouroboros/logs.h>
+
+flow_t * flow_create(int32_t port_id)
+{
+        flow_t * flow = malloc(sizeof *flow);
+        flow->port_id = port_id;
+        flow->oflags = FLOW_O_DEFAULT;
+        flow->state = FLOW_INIT;
+
+        pthread_mutex_init(&flow->lock, NULL);
+
+        return flow;
+}
+
+void flow_destroy(flow_t * flow)
+{
+        free(flow);
+}
+
+int flow_set_opts(flow_t * flow, uint16_t opts)
+{
+        if (flow == NULL) {
+                LOG_ERR("Non-existing flow.");
+                return -1;
+        }
+
+        pthread_mutex_lock(&flow->lock);
+
+        if ((opts & FLOW_O_ACCMODE) == FLOW_O_ACCMODE) {
+                pthread_mutex_unlock(&flow->lock);
+                LOG_WARN("Invalid flow options. Setting default.");
+                opts = FLOW_O_DEFAULT;
+        }
+
+        flow->oflags = opts;
+
+        pthread_mutex_unlock(&flow->lock);
+
+        return 0;
+}
+
+uint16_t flow_get_opts(const flow_t * flow)
+{
+        if (flow == NULL) {
+                LOG_ERR("Non-existing flow.");
+                return FLOW_O_INVALID;
+        }
+
+        return flow->oflags;
+}