I'm not even going comment on how SunOS returns this to a read(2)...

ad7ab013 · Poul-Henning Kamp · 13db3904 · ad7ab013
Commit ad7ab013 authored Nov 10, 2020 by Poul-Henning Kamp
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vtcp.c lib/libvarnish/vtcp.c +2 -0

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--- a/lib/libvarnish/vtcp.c
+++ b/lib/libvarnish/vtcp.c
@@ -575,6 +575,8 @@ VTCP_Check(ssize_t a)
 	if (errno == EAGAIN || errno == EWOULDBLOCK)
 		return (1);
 #if (defined (__SVR4) && defined (__sun))
+	if (errno == ECONNREFUSED)	// in r02702.vtc
+		return (1);
 	if (errno == EPROTO)
 		return (1);
 #endif