From 1b5d1b8870cb0ac1c4b99f6cf67e3277427df864 Mon Sep 17 00:00:00 2001
From: "Arnold D. Robbins" <arnold@skeeve.com>
Date: Mon, 4 Apr 2016 23:11:19 +0300
Subject: Add warning for fflush of closed write end on 2-way pipe.

---
 builtin.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'builtin.c')

diff --git a/builtin.c b/builtin.c
index c4d3d3a1..a1c09d5a 100644
--- a/builtin.c
+++ b/builtin.c
@@ -237,6 +237,9 @@ do_fflush(int nargs)
 		fp = rp->output.fp;
 		if (fp != NULL)
 			status = rp->output.gawk_fflush(fp, rp->output.opaque);
+		else if ((rp->flag & RED_TWOWAY) != 0)
+				warning(_("fflush: cannot flush: two-way pipe `%s' has closed write end"),
+					file);
 	} else if ((fp = stdfile(tmp->stptr, tmp->stlen)) != NULL) {
 		status = fflush(fp);
 	} else {
-- 
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