From 1d81ef9e242b8fc53fe1d94a09847b82945ce4f6 Mon Sep 17 00:00:00 2001
From: Pau Espin Pedrol <pespin@sysmocom.de>
Date: Mon, 10 Feb 2020 15:12:49 +0100
Subject: [PATCH] gw: Proper error log on non-existing netns

---
 srsue/src/stack/upper/gw.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/srsue/src/stack/upper/gw.cc b/srsue/src/stack/upper/gw.cc
index 5bc0d7bc6..917713631 100644
--- a/srsue/src/stack/upper/gw.cc
+++ b/srsue/src/stack/upper/gw.cc
@@ -347,6 +347,12 @@ int gw::init_if(char* err_str)
     std::string netns("/run/netns/");
     netns += args.netns;
     netns_fd = open(netns.c_str(), O_RDONLY);
+    if (netns_fd == -1) {
+      err_str = strerror(errno);
+      log.error("Failed to find netns %s (%s): %s\n",
+                args.netns.c_str(), netns.c_str(), err_str);
+      return SRSLTE_ERROR_CANT_START;
+    }
     if (setns(netns_fd, CLONE_NEWNET) == -1) {
       err_str = strerror(errno);
       log.error("Failed to change netns: %s\n", err_str);