From d8259aa1e495f846aac419ca7fdf3ba7877f87d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20=C5=BBenczykowski?= <maze@google.com>
Date: Mon, 27 Jun 2022 10:02:20 -0700
Subject: [PATCH] add missing logging for bpf_obj_pin operation
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Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ica8c15366c4db12fae1ac14c50fb46a5ab40acff
---
 libbpf_android/Loader.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libbpf_android/Loader.cpp b/libbpf_android/Loader.cpp
index 57e5303..b66d9c6 100644
--- a/libbpf_android/Loader.cpp
+++ b/libbpf_android/Loader.cpp
@@ -871,7 +871,11 @@ static int createMaps(const char* elfPath, ifstream& elfFile, vector<unique_fd>&
                 }
             } else {
                 ret = bpf_obj_pin(fd, mapPinLoc.c_str());
-                if (ret) return -errno;
+                if (ret) {
+                    int err = errno;
+                    ALOGE("pin %s -> %d [%d:%s]", mapPinLoc.c_str(), ret, err, strerror(err));
+                    return -err;
+                }
             }
             ret = chown(mapPinLoc.c_str(), (uid_t)md[i].uid, (gid_t)md[i].gid);
             if (ret) {