Integrate libmnl (minimal netlink) library with libosmocore select loop

This adds an easy way to listen to netlink events form the Linux kernel
from within libosmocore applications.

The new dependency can be disabled via the "--disable-lbimnl" configure flag.

Change-Id: I4f787ee68f0d6d04f0a5655eb57d55b3b326a42f

1 files changed, 22 insertions, 0 deletions

diff --git a/include/osmocom/core/mnl.h b/include/osmocom/core/mnl.h
new file mode 100644
index 00000000..11c83530
--- /dev/null
+++ b/include/osmocom/core/mnl.h
@@ -0,0 +1,22 @@
+/*! \file select.h
+ *  libmnl integration
+ */
+#pragma once
+
+#include <osmocom/core/select.h>
+#include <libmnl/libmnl.h>
+
+/*! osmocom wrapper around libmnl abstraction of netlink socket */
+struct osmo_mnl {
+	/*! osmo-wrapped netlink file descriptor */
+	struct osmo_fd ofd;
+	/*! libmnl socket abstraction */
+	struct mnl_socket *mnls;
+	/*! call-back called for received netlink messages */
+	mnl_cb_t mnl_cb;
+	/*! opaque data provided by user */
+	void *priv;
+};
+
+struct osmo_mnl *osmo_mnl_init(void *ctx, int bus, unsigned int groups, mnl_cb_t mnl_cb, void *priv);
+void osmo_mnl_destroy(struct osmo_mnl *omnl);