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core/tun: Add API osmo_tundev_get_fd

Change-Id: Ia8a7e7ec6d96c7aebc80528236a0e0d035e7f38d
---
M TODO-RELEASE
M include/osmocom/core/tun.h
M src/core/libosmocore.map
M src/core/tun.c
4 files changed, 13 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/79/38479/1

diff --git a/TODO-RELEASE b/TODO-RELEASE
index 8a1e0dc..b3e4742 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -9,3 +9,4 @@
 #library	what			description / commit summary line
 gb		ADD			add bssgp_parse_cell_id2/bssgp_create_cell_id2
 gsm		ADD			add osmo_rai_to_gprs/gprs_rai_to_osmo
+core  ADD     add API osmo_tundev_get_fd()
\ No newline at end of file
diff --git a/include/osmocom/core/tun.h b/include/osmocom/core/tun.h
index 86bd8df..21e7703 100644
--- a/include/osmocom/core/tun.h
+++ b/include/osmocom/core/tun.h
@@ -29,6 +29,8 @@
 
 const char *osmo_tundev_get_name(const struct osmo_tundev *tundev);
 
+int osmo_tundev_get_fd(const struct osmo_tundev *tundev);
+
 int osmo_tundev_set_dev_name(struct osmo_tundev *tundev, const char *dev_name);
 const char *osmo_tundev_get_dev_name(const struct osmo_tundev *tundev);
 
diff --git a/src/core/libosmocore.map b/src/core/libosmocore.map
index c5ab6e3..c48a2b9 100644
--- a/src/core/libosmocore.map
+++ b/src/core/libosmocore.map
@@ -569,6 +569,7 @@
 osmo_tundev_close;
 osmo_tundev_free;
 osmo_tundev_get_dev_name;
+osmo_tundev_get_fd;
 osmo_tundev_get_name;
 osmo_tundev_get_netdev;
 osmo_tundev_get_netns_name;
diff --git a/src/core/tun.c b/src/core/tun.c
index ec68a96..04a1972 100644
--- a/src/core/tun.c
+++ b/src/core/tun.c
@@ -489,6 +489,15 @@
 	return tundev->name;
 }
 
+/*! Get FD associated to the tundev object.
+ *  \param[in] tundev The tundev object from where to retrieve the field
+ *  \returns The fd of the currently open tundev, negative otherwise
+ */
+int osmo_tundev_get_fd(const struct osmo_tundev *tundev)
+{
+	return tundev->wqueue.bfd.fd;
+}
+
 /*! Set name used to name the tunnel interface created by the tundev object.
  *  \param[in] tundev The tundev object where the field is set
  *  \param[in] dev_name The tunnel interface name to use

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