From 4b171f7d69c92a0a296bba1639eef5570e49697a Mon Sep 17 00:00:00 2001
From: anton <anton@openbsd.org>
Date: Fri, 22 Oct 2021 05:03:04 +0000
Subject: [PATCH] add pipe select hangup test case; ok mpi@

---
 regress/sys/kern/pipe/Makefile      |  4 +-
 regress/sys/kern/pipe/pipe.c        |  3 +-
 regress/sys/kern/pipe/pipe.h        |  3 +-
 regress/sys/kern/pipe/test-select.c | 57 +++++++++++++++++++++++++++++
 4 files changed, 64 insertions(+), 3 deletions(-)
 create mode 100644 regress/sys/kern/pipe/test-select.c

diff --git a/regress/sys/kern/pipe/Makefile b/regress/sys/kern/pipe/Makefile
index b2ee4cfc406..38d5413c0bb 100644
--- a/regress/sys/kern/pipe/Makefile
+++ b/regress/sys/kern/pipe/Makefile
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.4 2020/12/16 22:59:55 bluhm Exp $
+#	$OpenBSD: Makefile,v 1.5 2021/10/22 05:03:04 anton Exp $
 
 PROG=		pipe
 
@@ -7,6 +7,7 @@ SRCS+=		test-close.c
 SRCS+=		test-kqueue.c
 SRCS+=		test-ping-pong.c
 SRCS+=		test-run-down.c
+SRCS+=		test-select.c
 SRCS+=		test-thundering-herd.c
 
 LDADD+=		-lpthread
@@ -22,6 +23,7 @@ TESTS+=	kqueue-write-eof
 TESTS+=	ping-pong
 TESTS+=	run-down-write-big
 TESTS+=	run-down-write-small
+TESTS+=	select-hup
 TESTS+=	thundering-herd-read-signal
 TESTS+=	thundering-herd-read-wakeup
 TESTS+=	thundering-herd-write-signal
diff --git a/regress/sys/kern/pipe/pipe.c b/regress/sys/kern/pipe/pipe.c
index 1352b543897..ce4d92a0ecb 100644
--- a/regress/sys/kern/pipe/pipe.c
+++ b/regress/sys/kern/pipe/pipe.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pipe.c,v 1.4 2020/06/29 18:25:37 anton Exp $	*/
+/*	$OpenBSD: pipe.c,v 1.5 2021/10/22 05:03:04 anton Exp $	*/
 
 /*
  * Copyright (c) 2019 Anton Lindqvist <anton@openbsd.org>
@@ -48,6 +48,7 @@ main(int argc, char *argv[])
 		{ "ping-pong",				test_ping_pong },
 		{ "run-down-write-big",			test_run_down_write_big },
 		{ "run-down-write-small",		test_run_down_write_small },
+		{ "select-hup",				test_select_hup },
 		{ "thundering-herd-read-signal",	test_thundering_herd_read_signal },
 		{ "thundering-herd-read-wakeup",	test_thundering_herd_read_wakeup },
 		{ "thundering-herd-write-signal",	test_thundering_herd_write_signal },
diff --git a/regress/sys/kern/pipe/pipe.h b/regress/sys/kern/pipe/pipe.h
index 93b2f316661..4bd910a7b08 100644
--- a/regress/sys/kern/pipe/pipe.h
+++ b/regress/sys/kern/pipe/pipe.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pipe.h,v 1.3 2020/06/29 18:25:37 anton Exp $	*/
+/*	$OpenBSD: pipe.h,v 1.4 2021/10/22 05:03:04 anton Exp $	*/
 
 /*
  * Copyright (c) 2019 Anton Lindqvist <anton@openbsd.org>
@@ -28,6 +28,7 @@ int test_kqueue_write_eof(void);
 int test_ping_pong(void);
 int test_run_down_write_big(void);
 int test_run_down_write_small(void);
+int test_select_hup(void);
 int test_thundering_herd_read_signal(void);
 int test_thundering_herd_read_wakeup(void);
 int test_thundering_herd_write_signal(void);
diff --git a/regress/sys/kern/pipe/test-select.c b/regress/sys/kern/pipe/test-select.c
new file mode 100644
index 00000000000..e2865eddbed
--- /dev/null
+++ b/regress/sys/kern/pipe/test-select.c
@@ -0,0 +1,57 @@
+/*	$OpenBSD: test-select.c,v 1.1 2021/10/22 05:03:04 anton Exp $	*/
+
+/*
+ * Copyright (c) 2021 Anton Lindqvist <anton@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/select.h>
+
+#include <err.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "pipe.h"
+
+/*
+ * Verify select(2) hangup semantics.
+ */
+int
+test_select_hup(void)
+{
+	fd_set writefds;
+	ssize_t n;
+	int pip[2];
+	int nready;
+	char c = 'c';
+
+	if (pipe(pip) == -1)
+		err(1, "pipe");
+	close(pip[0]);
+
+	FD_ZERO(&writefds);
+	FD_SET(pip[1], &writefds);
+	nready = select(pip[1] + 1, NULL, &writefds, NULL, NULL);
+	if (nready == -1)
+		err(1, "select");
+	if (nready != 1)
+		errx(1, "select: want 1, got %d", nready);
+	n = write(pip[1], &c, sizeof(c));
+	if (n != -1)
+		errx(1, "read: want -1, got %zd", n);
+	if (errno != EPIPE)
+		errx(1, "errno: want %d, got %d", EPIPE, errno);
+
+	return 0;
+}
-- 
2.20.1