[master] 561b653 EPIPE is a documented errno in tcp(7) on linux

[Poul-Henning Kamp]

commit 561b653523ba9361cea4d9c1841853cc647f13bd
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Fri Feb 23 07:57:12 2018 +0000

    EPIPE is a documented errno in tcp(7) on linux
    
    Fixes: #2582

diff --git a/lib/libvarnish/vtcp.c b/lib/libvarnish/vtcp.c
index fb320ce..93c2fce 100644
--- a/lib/libvarnish/vtcp.c
+++ b/lib/libvarnish/vtcp.c
@@ -567,7 +567,7 @@ VTCP_Check(int a)
 {
 	if (a == 0)
 		return (1);
-	if (errno == ECONNRESET || errno == ENOTCONN)
+	if (errno == ECONNRESET || errno == ENOTCONN || errno == EPIPE)
 		return (1);
 #if (defined (__SVR4) && defined (__sun)) || defined (__NetBSD__)
 	/*
@@ -575,7 +575,7 @@ VTCP_Check(int a)
 	 * connection.
 	 * This is a bug in Solaris and documented behaviour on NetBSD.
 	 */
-	if (errno == EINVAL || errno == ETIMEDOUT || errno == EPIPE)
+	if (errno == EINVAL || errno == ETIMEDOUT)
 		return (1);
 #elif defined (__APPLE__)
 	/*