1 files changed, 3 insertions, 0 deletions
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 {