commit 81ad054a96bae16e96f600ad74f0a6bee79a83e7
author Benjamin Poirier <benjamin.poirier@gmail.com> Fri Jul 28 13:25:14 2017 -0700
committer Brenden Blanco <bblanco@gmail.com> Fri Aug 11 07:54:03 2017 -0700
tree 0e10b667a99b146070c4d6f1a59445b9ee1da9a7
parent 8e86b9e90fa7bfc2274b1c801932cade5bccf564

tcptop: Filter out negative values in receive probe

When tcp_cleanup_rbuf() is called from tcp_recvmsg(), "copied" may be an
error code, especially -EAGAIN for non-blocking receives.

tools/tcptop.py

diff --git a/tools/tcptop.py b/tools/tcptop.py
index 0f9ead6..9ca10f6 100755
--- a/tools/tcptop.py
+++ b/tools/tcptop.py
@@ -148,6 +148,9 @@
     u16 dport = 0, family = sk->__sk_common.skc_family;
     u64 *val, zero = 0;
 
+    if (copied <= 0)
+	    return 0;
+
     if (family == AF_INET) {
         struct ipv4_key_t ipv4_key = {.pid = pid};
         ipv4_key.saddr = sk->__sk_common.skc_rcv_saddr;