Regression test for non-ubc mmap/ftruncate interaction.

Noticed on strip, test prompted by art@.

(turns out `normal' strip isn't affected because normal binaries are
page-padded).

2 files changed, 83 insertions, 0 deletions

diff --git a/regress/sys/kern/mmap3/Makefile b/regress/sys/kern/mmap3/Makefile
new file mode 100644
index 00000000000..bcc5b0c794b
--- /dev/null
+++ b/regress/sys/kern/mmap3/Makefile
@@ -0,0 +1,4 @@
+#	$OpenBSD: Makefile,v 1.1 2002/08/21 12:53:35 espie Exp $
+
+PROG=	mmaptest
+.include <bsd.regress.mk>
diff --git a/regress/sys/kern/mmap3/mmaptest.c b/regress/sys/kern/mmap3/mmaptest.c
new file mode 100644
index 00000000000..3bb677ea0ee
--- /dev/null
+++ b/regress/sys/kern/mmap3/mmaptest.c
@@ -0,0 +1,79 @@
+/* $OpenBSD: mmaptest.c,v 1.1 2002/08/21 12:53:35 espie Exp $ */
+/*
+ * Copyright (c) 2002 Marc Espie.
+ *
+ * Extensive code modifications for the OpenBSD project.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
+ * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <err.h>
+
+/* 
+ * Check for mmap/ftruncate interaction.  Specifically, ftruncate on
+ * a short file may lose modifications made through an mmapped area.  
+ */
+int 
+main()
+{
+	int i;
+	int fd;
+	char area[256];
+	char *a2;
+	for (i = 0 ; i < 256; i++)
+		area[i] = 5;
+
+	fd = open("test.out", O_WRONLY|O_CREAT|O_TRUNC, 0600);
+	if (fd == -1)
+		err(1, "open(test.out)");
+	if (write(fd, area, 256) != 256)
+		err(1, "write");
+	if (close(fd))
+		err(1, "close");
+	fd = open("test.out", O_RDWR);
+	if (fd == -1)
+		err(1, "open(test.out) 2");
+	a2 = mmap(NULL, 256, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+	if (!a2)
+		err(1, "mmap");
+	a2[10] = 3;
+	if (ftruncate(fd, 128))
+		err(1, "ftruncate");
+	if (close(fd))
+		err(1, "close");
+	fd = open("test.out", O_RDONLY);
+	if (fd == -1)
+		err(1, "open(test.out) 3");
+	if (read(fd, area, 256) != 128)
+		err(1, "read");
+	if (area[10] != 3)
+		errx(1, "area[10] != 3");
+	if (close(fd))
+		err(1, "close");
+	return 0;
+}
+