pingpong: extend the response reading error with errno

To help diagnosing the cause of the problem.

See #9380
Closes #9443

diff --git a/lib/pingpong.c b/lib/pingpong.c
index 74a678a1a42f8cdc593ef7ea9519dea8ed1025dd..d4e6be98c47b3fbb1eb31b3ea5d28583b1587687 100644 (file)
--- a/lib/pingpong.c
+++ b/lib/pingpong.c
@@ -330,7 +330,7 @@ CURLcode Curl_pp_readresp(struct Curl_easy *data,
     else if(gotbytes <= 0) {
       keepon = FALSE;
       result = CURLE_RECV_ERROR;
-      failf(data, "response reading failed");
+      failf(data, "response reading failed (errno: %d)", SOCKERRNO);
     }
     else {
       /* we got a whole chunk of data, which can be anything from one