[PATCH iproute] libgenl: report a verbose error if rtnl_talk fails

[Denis Kirjanov <kirjanov@gmail.com>]

Currenlty rtnl_talk() doesn't give us the reason
if it fails.

Signed-off-by: Denis Kirjanov <kirjanov@gmail.com>
---
 lib/libgenl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/libgenl.c b/lib/libgenl.c
index fca07f9f..9927af84 100644
--- a/lib/libgenl.c
+++ b/lib/libgenl.c
@@ -58,7 +58,8 @@ int genl_resolve_family(struct rtnl_handle *grth, const char *family)
 		  family, strlen(family) + 1);
 
 	if (rtnl_talk(grth, &req.n, &answer) < 0) {
-		fprintf(stderr, "Error talking to the kernel\n");
+		fprintf(stderr, "Error talking to the kernel: %s (errno %d)\n",
+			strerror(errno), errno);
 		return -2;
 	}
 
@@ -103,7 +104,8 @@ int genl_add_mcast_grp(struct rtnl_handle *grth, __u16 fnum, const char *group)
 	addattr16(&req.n, sizeof(req), CTRL_ATTR_FAMILY_ID, fnum);
 
 	if (rtnl_talk(grth, &req.n, &answer) < 0) {
-		fprintf(stderr, "Error talking to the kernel\n");
+		fprintf(stderr, "Error talking to the kernel: %s (errno %d)\n",
+			strerror(errno), errno);
 		return -2;
 	}
 
-- 
2.43.0