osmith has uploaded this change for review.

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dev_create: support returning -EEXIST

Check if netlink has set errno to EEXIST and return -EEXIST in
gtp_dev_create() and gtp_dev_create_sgsn(). Users of the function can
use this to delete the GTP device and try creating it again.

Related: SYS#7240
Change-Id: Ib99bd8eed854014a5c9118c23e4058a41f3145f2
---
M src/gtp-rtnl.c
1 file changed, 7 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/libgtpnl refs/changes/60/39160/1

diff --git a/src/gtp-rtnl.c b/src/gtp-rtnl.c
index e0db921..b43d9d6 100644
--- a/src/gtp-rtnl.c
+++ b/src/gtp-rtnl.c
@@ -25,6 +25,7 @@
 #include <unistd.h>
 #include <string.h>
 #include <time.h>
+#include <errno.h>
 
 #include <libmnl/libmnl.h>
 #include <net/if.h>
@@ -143,7 +144,12 @@
 EXPORT_SYMBOL(gtp_dev_create);
 int gtp_dev_create(int dest_ns, const char *gtp_ifname, int fd0, int fd1)
 {
-	return _gtp_dev_create(dest_ns, gtp_ifname, fd0, fd1, GTP_ROLE_GGSN);
+	int rc = _gtp_dev_create(dest_ns, gtp_ifname, fd0, fd1, GTP_ROLE_GGSN);
+
+	if (rc < 0 && errno == EEXIST)
+		return -EEXIST;
+
+	return rc;
 }
 
 EXPORT_SYMBOL(gtp_dev_create_sgsn);

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