Make sure the correct errno is reported by warn* or err* and not

the errno of an intervening cleanup operation like close/unlink/etc.

Diff from Doug Hogan (doug (at) acyclic.org)

1 files changed, 3 insertions, 2 deletions

diff --git a/src/usr.bin/nc/netcat.c b/src/usr.bin/nc/netcat.c
index 76794df6c0..58454595b2 100644
--- a/src/usr.bin/nc/netcat.c
+++ b/src/usr.bin/nc/netcat.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: netcat.c,v 1.121 2014/06/10 16:35:42 tedu Exp $ */
+/* $OpenBSD: netcat.c,v 1.122 2014/07/20 01:38:40 guenther Exp $ */
 /*
  * Copyright (c) 2001 Eric Jackson <ericj@monkey.org>
  *
@@ -753,8 +753,9 @@ readwrite(int nfd)
                         sleep(iflag);
 
                 if ((n = poll(pfd, 2 - dflag, timeout)) < 0) {
+                        int saved_errno = errno;
                         close(nfd);
-                        err(1, "Polling Error");
+                        errc(1, saved_errno, "Polling Error");
                 }
 
                 if (n == 0)